LiftMaster RSL12UL Instruction Manual

This page presents the LiftMaster RSL12UL residential DC vehicular slide gate operator installation manual as searchable, linkable HTML: specifications, safety requirements, installation, wiring, programming, troubleshooting, diagnostic codes, maintenance, and replacement parts.

Common tasks: Program travel limits | Program a remote | Wiring diagram | Diagnostic codes | Gate will not close | Replace the battery | Replacement parts

Earlier manual revisions: differences to check before you work

This page follows Rev. C (01-39379, © 2023). An earlier RSL12UL manual (01-39379B, © 2018), as hosted by a third party, was compared with Rev. C. It has not been confirmed with LiftMaster. These differences affect field procedures:

Differences found between the earlier manual (01-39379B) and Rev. C (01-39379)

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Differences found between the earlier manual (01-39379B) and Rev. C (01-39379)

Topic	Earlier manual (01-39379B, 2018)	Rev. C (this page)	See
Manual disconnect	Press the reset switch to RESET/DISCONNECT. Release the handle on the operator arm to allow the gate to be opened and closed manually (on a dual gate, on both operators); to resume normal function tighten the handle by pushing it down.	Press the reset switch to the off position "O" (on both operators of a dual gate); to resume normal operation put the switch to the on position "I".	Manual disconnect
Concrete pad	Reinforced concrete is recommended.	Reinforced concrete is required.	Mounting
Obstruction test, step 2	Place an object between the open gate and a rigid structure.	Either place an object between the open gate and the fixed closed catch post or obstruct the gate by hand.	Obstruction test
Safety instructions, release wording (page 3)	"Use the emergency release ONLY when the gate is not moving."	"Use the manual disconnect release ONLY when the gate is not moving."	Safety
Gate safety features list	Includes "Vertical Posts" among the safety features.	Does not list vertical posts.	Safety installation information
Wireless edge capacity	Expansion board: up to 4 edge sensors using wireless edge sensor kit model LMWEKITU.	Expansion board: up to 8 edge sensors when using wireless edge sensor kit models LMWEKITU and LMWETXU.	Specifications
Solar usage note	Says photoelectric sensor heaters are not recommended in solar applications. No myQ recommendation.	Adds: if connecting to the internet (myQ), use at minimum 40W of solar panels and two 33AH batteries.	Solar power
Diagnostic code table	Lists code 99 (Normal Operation). No code 00.	Lists code 00 (Normal Operation) as well as code 99.	Diagnostic codes
Who performs maintenance	"ALL maintenance MUST be performed by a LiftMaster professional."	"ALL maintenance MUST be performed by a Trained Gate Systems Technician."	Maintenance
Accessory model numbers	877MAX keyless entry; CP3 vehicle sensing probe.	878MAX keyless entry; CP4 vehicle sensing probe.	Accessories
Installation steps	Eight steps; Step 8 is Install the Cover (no separate warning sign step).	Nine steps; Step 9 is Install Warning Signs.	Installation

Not compared: the drawings, and LiftMaster's separate pre-2022 wiring diagram and post-2022 troubleshooting guide. The troubleshooting chart has the same 23 symptom rows in both revisions, and the wire-length table, specifications, and warranty (three years) are the same apart from the items above. If your operator shipped with an earlier manual, follow the manual supplied with it and confirm with LiftMaster support which revision applies. See also the wiring diagram section.

LiftMaster RSL12UL Manual Overview

The LiftMaster RSL12UL is a 12 Vdc residential slide gate operator that runs from its battery and charges it from a 120 Vac plug-in transformer or a solar panel. LiftMaster's installation manual (document 01-39379) states that the product is for use on vehicular passage gates only, is not intended for pedestrian passage gates, and is intended for Class I and II vehicular slide gate applications. It is compatible with myQ and Security+ 2.0 accessories. LiftMaster also states that the product is to be installed and serviced by a trained gate systems technician only, and that the operator requires a LiftMaster external monitored entrapment protection device to be installed in all entrapment zones (see UL 325 entrapment protection requirements).

Source: LiftMaster manual, 01-39379 Rev. C, cover page.

What Is in the RSL12UL Carton

LiftMaster lists the following items in the RSL12UL carton:

• Operator and cover
• LiftMaster Monitored Retro-Reflective Photoelectric Sensor, Model LMRRUL
• 5 ft edge sensor kit
• Warning signs (2) and warranty card
• Battery, 12 Vdc 7AH
• Installation manual

Not shown in LiftMaster's carton illustration: documentation packet, #41 chain (30 feet), and eye bolt kit.

Source: LiftMaster manual, 01-39379 Rev. C, page 5.

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LiftMaster RSL12UL Specifications

The following specifications are from the Operator Specifications table in LiftMaster's RSL12UL installation manual.

LiftMaster RSL12UL operator specifications

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Source: LiftMaster manual, 01-39379 Rev. C, page 6.

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Important Safety Information

This section reproduces the safety requirements that LiftMaster places at the front of the RSL12UL manual. Safety text is kept close to the manufacturer's wording on purpose.

Safety Symbols and Who Should Service the RSL12UL

LiftMaster uses safety symbols and signal words to alert you to the possibility of serious injury or death if the accompanying warnings are not followed. The hazard may be mechanical or electrical. A separate signal word alerts you to possible damage to the gate or the gate operator.

Source: LiftMaster manual, 01-39379 Rev. C, page 1.

Gate Operator Usage Classes

LiftMaster states that the RSL12UL is intended for Class I and II vehicular slide gate applications. LiftMaster defines the four UL 325 usage classes in the manual as follows:

• Class I, Residential Vehicular Gate Operator: intended for use in garages or parking areas associated with a residence of one to four single families.
• Class II, Commercial/General Access Vehicular Gate: intended for use in a commercial location or building such as a multi-family housing unit (five or more single family units), hotel, garages, retail store, or other buildings accessible by or servicing the general public.
• Class III, Industrial/Limited Access Vehicular Gate: intended for use in an industrial location or building such as a factory or loading dock area or other locations not accessible by or intended to service the general public.
• Class IV, Restricted Access Vehicular Gate Operator: intended for use in a guarded industrial location or building such as an airport security area or other restricted access locations not servicing the general public, in which unauthorized access is prevented via supervision by security personnel. (The RSL12UL is not rated for Class III or IV.)

Source: LiftMaster manual, 01-39379 Rev. C, page 2.

UL 325 Entrapment Protection Requirements for the RSL12UL

Definitions (LiftMaster)

• Entrapment: the condition when a person is caught or held in a position that increases the risk of injury.
• Slide gate entrapment zone: an entrapment zone exists if at any point during travel, the gap between the gate and any opposing fixed edge or surface such as posts, walls, pillars, columns or the operator itself, is less than 16 in. (406 mm) in a location up to 6 ft. (1.8 m) above grade.
• Independent monitored entrapment protection device: an entrapment protection device is independent if it is a different type (photoelectric sensors, edge device, inherent protection device) from the other devices in the same entrapment zone.

Use the Site Planning Safety Checklist to identify the entrapment zones found in your installation (see the official LiftMaster Gate Safety Checklist).

Source: LiftMaster manual, 01-39379 Rev. C, page 2.

Safety Installation Information

LiftMaster lists the following items as safety installation information for vehicular slide gate systems:

1. Vehicular gate systems provide convenience and security. Gate systems are comprised of many component parts. The gate operator is only one component. Each gate system is specifically designed for an individual application.
2. Gate operating system designers, installers and users must take into account the possible hazards associated with each individual application. Improperly designed, installed or maintained systems can create risks for the user as well as the bystander. Gate systems design and installation must reduce exposure to potential hazards.
3. A gate operator can create high levels of force in its function as a component part of a gate system. Therefore, safety features must be incorporated into every gate system design. Specific safety features include: edge sensors (contact), guards for exposed rollers, photoelectric sensors, screen mesh, and instructional and precautionary signage.
4. Install the gate operator only when: (a) the operator is appropriate for the construction and the usage class of the gate; (b) all openings of a horizontal slide gate are guarded or screened from the bottom of the gate to a minimum of 6 feet (1.8 m) above the ground to prevent a 2-1/4 inches (6 cm) diameter sphere from passing through the openings anywhere in the gate, and in that portion of the adjacent fence that the gate covers in the open position; (c) all exposed pinch points are eliminated or guarded, and guarding is supplied for exposed rollers.
5. The gate operator is intended for installation only on gates used for vehicles. Pedestrians must be supplied with a separate access opening. The pedestrian access opening shall be designed to promote pedestrian usage. Locate the pedestrian access such that persons will not come in contact with the vehicular gate during the entire path of travel of the vehicular gate.
6. The gate must be installed in a location so that enough clearance is supplied between the gate and adjacent structures when opening and closing to reduce the risk of entrapment.
7. The gate must be properly installed and work freely in both directions prior to the installation of the gate operator.
8. Permanently mounted access controls intended for users to activate must be located at least 6 feet (1.8 m) away from any moving part of the gate and where the user is prevented from reaching over, under, around or through the gate to operate the controls. Outdoor or easily accessible controls shall have a security feature to prevent unauthorized use. Exception: emergency access controls only accessible by authorized personnel (e.g. fire, police) may be placed at any location in the line-of-sight of the gate.
9. For a gate operator utilizing a Stop and/or Reset button, it must be located in the line-of-sight of the gate. Activation of the reset control shall not cause the operator to start.
10. A minimum of two (2) WARNING SIGNS shall be installed in the area of the gate. Each warning sign is to be visible by persons located on the side of the gate on which the sign is installed.
11. For a gate operator utilizing a non-contact sensor: (a) see the Install Entrapment Protection section for placement of the non-contact sensor for each type of application; (b) care shall be exercised to reduce the risk of nuisance tripping, such as when a vehicle trips the sensor while the gate is still moving; (c) one or more non-contact sensors shall be located where the risk of entrapment or obstruction exists, such as the perimeter reachable by a moving gate or barrier.
12. For a gate operator utilizing a contact sensor such as an edge sensor: (a) one or more contact sensors shall be located where the risk of entrapment or obstruction exists, such as at the leading edge, trailing edge and post mounted both inside and outside of a vehicular horizontal slide gate; (b) a hard wired contact sensor shall be located and its wiring arranged so the communication between the sensor and the gate operator is not subject to mechanical damage; (c) a wireless device such as one that transmits radio frequency (RF) signals to the gate operator for entrapment protection functions shall be located where the transmission of the signals are not obstructed or impeded by building structures, natural landscaping or similar obstruction, and shall function under the intended end-use conditions.

Source: LiftMaster manual, 01-39379 Rev. C, page 3.

Role of Dealers, Installers, and End Users

Dealers, installers, and trained gate system technicians (LiftMaster):

• Ensure the entire system being designed, manufactured, and installed meets all applicable standards and codes including UL 325 and ASTM F2200.
• Demonstrate the basic functions and safety features of the gate system to owners, end users, and general contractors, including how to turn off power and how to operate the manual disconnect feature.
• Leave safety instructions, product literature, installation manual and maintenance manual with end user.
• Explain to the owners the importance of testing by a trained gate system technician that includes a routine re-testing of the entire system including the entrapment protection devices, and explain the need for the owners to ensure that this testing is performed monthly.

End users and homeowners (LiftMaster):

• Contact a trained gate systems technician to maintain and repair the gate system. End users should never attempt to repair the gate system.
• Retain and utilize the installation manual and maintenance and important safety instructions.
• Routinely check all gate operator functions and gate movement.
• Discontinue use if safety systems operate improperly, the gate is damaged, or the gate is difficult to move. Contact a trained gate systems technician to repair the gate system.
• Prominently display and maintain warning signs on both sides of the gate.

Source: LiftMaster manual, 01-39379 Rev. C, page 3.

Gate Construction Requirements (ASTM F2200)

LiftMaster states that vehicular gates should be installed in accordance with ASTM F2200, Standard Specification for Automated Vehicular Gate Construction. The manual lists these provisions:

General requirements

• Gates shall be constructed in accordance with the provisions given for the appropriate gate type.
• Gates shall be designed, constructed and installed to not fall over more than 45 degrees from the vertical plane when a gate is detached from the supporting hardware.
• Gates shall have smooth bottom edges, with vertical bottom edged protrusions not exceeding 0.50 inches (12.7 mm) other than the exceptions listed in ASTM F2200.
• The minimum height for barbed tape shall not be less than 8 feet (2.44 m) above grade and for barbed wire shall not be less than 6 feet (1.83 m) above grade.
• An existing gate latch shall be disabled when a manually operated gate is retrofitted with a powered gate operator. A gate latch shall not be installed on an automatically operated gate.
• Protrusions shall not be permitted on any gate (see ASTM F2200 for exceptions).
• Gates shall be designed, constructed and installed such that their movement shall not be initiated by gravity when an automatic operator is disconnected. A vehicular horizontal slide gate shall not result in continuous, unimpeded movement in either lineal direction of its travel.
• For pedestrian access in the vicinity of an automated vehicular gate, a separate pedestrian access shall be provided or available, located so that a pedestrian does not come in contact with a moving vehicular access gate during the entire path of travel. A pedestrian gate shall not be incorporated into an automated vehicular gate panel.

Vehicular horizontal slide gates, Class I, II and III

• All weight bearing exposed rollers 8 feet (2.44 m) or less above grade shall be guarded or covered.
• All openings shall be designed, guarded, or screened from the bottom of the gate to the top of the gate or a minimum of 6 ft. (1.83 m) above grade, whichever is less, to prevent a 2-1/4 in. (57 mm) diameter sphere from passing through the openings anywhere in the gate, and in that portion of the adjacent fence that the gate covers in the open position. The gate panel includes the entire section of the moving gate, including any back frame or counterbalance portion.
• A gap, measured in the horizontal plane parallel to the roadway, between a fixed stationary object nearest the roadway (such as a gate support post) and the gate frame when the gate is in either the fully open position or the fully closed position, shall not exceed 2-1/4 inches (57 mm). Exception: all other fixed stationary objects greater than 16 in. (406 mm) from the gate frame are not required to comply.
• Positive stops shall be required to limit travel to the designed fully open and fully closed positions, installed at either the top of the gate or the bottom of the gate, projecting horizontally or vertically no more than required to perform their intended function.
• All gates shall be designed with sufficient lateral stability to assure that the gate will enter a receiver guide.

Vehicular horizontal slide gates, Class IV

• All weight bearing exposed rollers 8 feet (2.44 m) or less above grade shall be guarded or covered.
• Positive stops shall be required to limit travel to the designed fully open and fully closed positions.

Specific applications: any non-automated gate to be automated shall be upgraded to conform to ASTM F2200; the specification does not apply to gates generally used for pedestrian access or to vehicular gates not to be automated; when the gate operator or the gate of an automated system is replaced, the existing or new gate shall conform to ASTM F2200.

Source: LiftMaster manual, 01-39379 Rev. C, page 4.

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LiftMaster RSL12UL Installation

LiftMaster presents RSL12UL installation as nine steps, followed by limit and force adjustment and an obstruction test. Each step below is labeled with the matching LiftMaster step number.

1. Step 1, Determine location for operator
2. Step 2, Install the operator
3. Step 3, Attach the chain
4. Step 4, Install entrapment protection
5. Step 5, Earth ground rod
6. Step 6, Power wiring (the manual's battery connection procedures follow this step; see Battery Connections)
7. Step 7, Dual gate setup
8. Step 8, Install the cover
9. Step 9, Install warning signs

After Step 9, LiftMaster states that the basic installation is complete and continues with limit and force adjustment and the obstruction test.

Installation Requirements

Before installing the LiftMaster RSL12UL, LiftMaster requires that the gate be properly installed and work freely in both directions, that the gate meet ASTM F2200 construction requirements and fit the operator's specifications, and that national and local building codes be checked. See Gate Construction Requirements and Specifications.

LiftMaster describes two layouts:

• Standard installation: the operator is installed near the front roller of the gate.
• Rear installation: the operator is installed near the back of the gate in the OPEN position. This layout requires two extra idler pulleys.

Source: LiftMaster manual, 01-39379 Rev. C, page 8.

Site Preparation

• Conduit and concrete pad: trench and install conduit. Before trenching, contact underground utility locating companies. Conduit must be UL approved for low and high voltage. Consider the operator placement BEFORE installing the pad or post.
• Gate: the gate must be constructed and installed according to ASTM F2200 standards and must fit the operator's specifications.
• Vehicle loops: the vehicle loops allow the gate to stay open when vehicles are obstructing the gate path. They are suggested for vehicles 14 feet (4.27 m) or longer. Vehicle loops are not required but are recommended. Before installing access control devices, complete a site survey and determine the best device for your site needs.
• Warning signs: install a warning sign (two provided) on the inside and outside of the property, where easily visible.

Source: LiftMaster manual, 01-39379 Rev. C, page 7.

Mounting the LiftMaster RSL12UL (Steps 1 and 2)

These steps locate and pour the concrete pad and attach the RSL12UL to it. Check national and local building codes before installation.

LiftMaster's layout drawings show the pad 6 inches above ground and below the frost line (check all national and local codes), and label the pad with 24 inch (61 cm) dimensions. See the original drawing on page 9 for exact placement relative to the gate and conduit.

Source: LiftMaster manual, 01-39379 Rev. C, page 9.

Source: LiftMaster manual, 01-39379 Rev. C, page 10.

Installing the Drive Chain (Step 3)

Source: LiftMaster manual, 01-39379 Rev. C, page 11.

To tighten the chain after it has stretched, see Drive Chain maintenance.

Installing Entrapment Protection Devices on the RSL12UL (Step 4)

Install entrapment protection devices according to the UL 325 requirements in this section, and use the Site Planning Safety Checklist to identify the entrapment zones that will result from the installation.

LiftMaster's illustration (credited to the DASMA Gate Systems Safety Guide) shows an example site with photoelectric sensors in the open and close directions, edge sensors, interior posts and non-pinch rollers, a requirement that the gap between vertical bars be less than 2-1/4 in. (57 mm), and a separate pedestrian entrance. LiftMaster notes that any gap larger than 2-1/4 in. (57 mm) between the gate and fixed objects MUST be protected, that edge sensors should be installed where the gap between the post and gate creates an entrapment zone, that the example is for illustration only and your site may have additional entrapment zones which MUST be protected, and that you should take a photograph of the complete installation site for your records.

Source: LiftMaster manual, 01-39379 Rev. C, page 12.

Wiring entrapment protection devices

LiftMaster describes three options for wiring external devices, depending on the device and how it will function. Refer to the manual included with your entrapment protection device. The inputs are for monitored devices, which include pulsed photoelectric sensors, resistive edge sensors, and pulsed edge sensors. Only one monitored entrapment protection device may be wired to each input. Additional monitored devices may be wired to the expansion board (not provided). Board inputs for entrapment protection devices are yellow.

RSL12UL entrapment protection inputs

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Source: LiftMaster manual, 01-39379 Rev. C, page 13.

Earth Ground Rod (Step 5)

Use the proper earth ground rod for your local area. The ground wire must be a single, whole piece of wire. Never splice two wires for the ground wire. If you should cut the ground wire too short, break it, or destroy its integrity, replace it with a single wire length.

1. Install the earth ground rod within 3 feet (.9 m) of the operator.
2. Run wire from the earth ground rod to the operator.

Note from LiftMaster: if the operator is not grounded properly the range of the remote controls will be reduced and the operator will be more susceptible to lightning and surge damage. Check national and local codes for proper depth.

Source: LiftMaster manual, 01-39379 Rev. C, page 14.

Electrical and Power Connections (Step 6)

The LiftMaster RSL12UL can be wired for either 120 Vac or a solar panel (not provided). Follow the directions according to your application. The battery is charged in the circuit by the integrated transformer. The operator requires one 7AH battery (provided) or one 33AH battery; the 33AH application requires the 33AH wire harness (Model K94-37236). For dual gate applications, power will have to be connected to each operator, and main power supply and control wiring MUST be run in separate conduits. For solar applications, see Solar Power Connections.

All control wiring used to connect external devices to Class 2 circuits of the operator must be (QPTZ) Power-Limited Circuit Cables, Type CL2, CL2P, CL2R, or CL2X or other cable with equivalent or better electrical, mechanical, and flammability ratings.

Source: LiftMaster manual, 01-39379 Rev. C, page 14.

RSL12UL maximum wire length in feet (meters)

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Use copper conductors ONLY.

Source: LiftMaster manual, 01-39379 Rev. C, page 15.

Dual Gate Setup (Step 7)

There are two options for dual gate communication: wired or wireless. Follow the directions according to your application. Do not use wired and wireless communication simultaneously. Wired dual gate applications will have a longer battery standby time than wireless applications. LiftMaster recommends that all accessories and board configurations are set on the primary operator.

Source: LiftMaster manual, 01-39379 Rev. C, page 17.

Bipart delay and synchronized close

The LOCK/BIPART DELAY switch is used only with dual gate applications and serves two functions. For the bipart delay function on slide gate applications, LiftMaster states: not applicable, set to OFF. For synchronized close, used where one gate travels a longer distance than the other, set the LOCK/BIPART DELAY switch to ON for both operators to synchronize the closing of the gates.

Source: LiftMaster manual, 01-39379 Rev. C, page 18.

Install the Cover (Step 8)

Before installing the cover, follow the instructions in the Adjustment section to adjust the limits and force.

Install Warning Signs (Step 9)

Installers MUST install the UL required warning signs. The signs MUST be installed in plain view on both sides of each gate installed. Use the fastening holes in each corner to permanently secure the sign. LiftMaster states that the basic installation is then complete.

Source: LiftMaster manual, 01-39379 Rev. C, page 19.

Installation Testing

After installing the operator, LiftMaster requires testing of ALL entrapment protection devices (per the manual provided with each device) and testing of the inherent entrapment protection with the obstruction test below. LiftMaster also requires that the gate operator be tested monthly, and again after any adjustment of force or travel limits.

Source: LiftMaster manual, 01-39379 Rev. C, page 21.

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LiftMaster RSL12UL Wiring

Source: LiftMaster manual, 01-39379 Rev. C, pages 14 and 42.

LiftMaster RSL12UL Wiring Diagram

The RSL12UL wiring diagram is on page 42 of LiftMaster's installation manual (document 01-39379 Rev. C). LiftMaster also publishes a separate RSL12UL wiring diagram for units manufactured prior to 2022. If your operator was built before 2022, check which diagram LiftMaster lists for your unit before wiring. This page does not reproduce the diagram; use the original LiftMaster document for terminal-level connections.

Open the LiftMaster manual (wiring diagram on page 42)

The page 42 wiring diagram shows the following components and connections:

• Control board with antenna and coaxial antenna cable, jumper wires, and the diagnostics display
• Transformer connected to the control board (labeled "To J25"), the 12V 7AH battery with a blocking diode, and the AC and BATT FAIL and BACKDRIVE switches
• Product ID connection, piezo alarm, the run / stop / reset switch, the 1/8 HP 12 Vdc motor, and the APS encoder
• Field wiring for photoelectric sensors and edge sensors, and the shielded twisted pair primary/secondary link to the other gate operator (the diagram note reads "Ground the shield of the cable to the chassis ground of each operator"; see the documentation note below)
• One, two, or three 10W solar panels wired in parallel (30W maximum)
• Accessory power outlets, heater, and the input power connection
• The optional expansion board with loop detector, wire loops, wireless edge, and eye/edge inputs

Source: LiftMaster manual, 01-39379 Rev. C, page 42.

RSL12UL Control Board Connections

All control wiring used to connect external devices to Class 2 circuits of the operator must be (QPTZ) Power-Limited Circuit Cables, Type CL2, CL2P, CL2R, or CL2X or other cable with equivalent or better electrical, mechanical, and flammability ratings. The EXIT, SHADOW, and INTERRUPT inputs are NOT TO BE USED AS ENTRAPMENT PROTECTION.

LiftMaster RSL12UL control board inputs and outputs

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Source: LiftMaster manual, 01-39379 Rev. C, pages 13, 26, and 27.

RSL12UL Expansion Board and Accessory Connections

The expansion board is optional on the LiftMaster RSL12UL (specifications, page 6) and is not provided. LiftMaster lists the expansion board (Model K1D8387-1CC), described as adding "additional programming features including external loops, plug-in loops, auxiliary relays, and inputs for additional controls and entrapment protection devices," and the wire harness between the main control board and expansion board (Model K94-34778) in the manual's accessories (page 45).

The RSL12UL manual does not include an expansion board section. Use the instructions supplied with the expansion board for its switches, auxiliary relays, and inputs. The RSL12UL manual refers to the expansion board in these places: the entrapment protection input table above, the INTERRUPT input (quick close and anti-tailgate features), and the troubleshooting chart row "Alarm beeps when running" (pre-warning setting).

Source: LiftMaster manual, 01-39379 Rev. C, pages 6, 13, and 45.

RSL12UL Battery Connections

The RSL12UL operator requires one 7AH battery (provided) or one 33AH battery. The battery is charged in the circuit by the integrated transformer.

Source: LiftMaster manual, 01-39379 Rev. C, page 16.

RSL12UL Solar Power Connections

Solar panels are not provided. LiftMaster lists these solar application requirements: a minimum of one 10W solar panel (Model SP10W12V); a maximum of three 10W solar panels in parallel (Model SP10W12V); the battery harness (Model K94-37236); one 7AH battery or one 33AH battery; and a heater cannot be used with a solar application. The use of photoelectric sensor heaters (models LMRRUL and LMTBUL) is NOT recommended in solar applications.

LiftMaster's solar zones are based on average solar radiation and the temperature effects on batteries: Zone 1 (6 hours of sunlight per day) is ideal for solar; Zone 2 (4 hours) is recommended; Zone 3 (2 hours) depends on the type of gate operator and location of the solar panel. Solar powered gate operator installations are not supported in northern climates due to cold weather and a reduced number of hours of sunlight during the winter months. The cycles per day ratings are approximations. Solar panels cannot be installed in areas that experience long periods of heavy fog, lake effect snow, or rain.

Source: LiftMaster manual, 01-39379 Rev. C, page 37.

Typical RSL12UL system standby battery current consumption (12V)

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Add up the current draw by feature and accessory to determine total current draw. For gate cycles per day by zone, panel wattage, and battery option, see the RSL12UL solar chart on page 38 of the manual or LiftMaster's Gate Operator Solar Cycle Reference Guide. As an example from that chart: at a 6 mA battery current draw in Zone 1, a 10W panel is rated for 33 cycles per day with a 7AH battery and 38 with a 33AH battery, while the 20W and 30W panel rows show 50 cycles per day for every battery option. All figures are LiftMaster estimates ("All numbers are estimates. Actual results may vary.").

LiftMaster also states: if adding a solar kit to this operator AND connecting it to the internet (myQ), it is recommended you use at minimum the following setup for optimum performance: minimum 40W solar panels and two 33AH batteries.

Source: LiftMaster manual, 01-39379 Rev. C, page 38.

RSL12UL maximum solar wire length in feet (meters)

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Chart assumes copper wire, 65°C, 5% drop, 30V nominal.

Source: LiftMaster manual, 01-39379 Rev. C, pages 39 and 40.

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LiftMaster RSL12UL Programming

LiftMaster covers travel limits and force under "Adjustment" and remote controls, the Internet Gateway, and reset functions under "Programming." This page groups them by task. Programming procedures apply to the LiftMaster RSL12UL (display shows "SL" followed by "12").

How to Program Travel Limits on the LiftMaster RSL12UL

The RSL12UL uses electronic limit and force controls. Setting the open and close limits also sets the force automatically; the force is then fine-tuned with the REVERSAL FORCE dial. Limits can be set from the control board (this procedure) or with a 3-button remote control (see below).

Prerequisites (LiftMaster): the gate MUST be attached to the operator before setting the limits and force. For dual gate applications the limits must be set for each operator. For slide gate applications the open limit and closed limit MUST be set at least four feet apart. The TEST buttons on the control board will not work until the limits have been set and the required entrapment protection devices are installed. If a mistake is made while programming the limits, press the reset button to start over.

Source: LiftMaster manual, 01-39379 Rev. C, page 20.

RSL12UL limit setup LEDs (next to the SET OPEN and SET CLOSE buttons)

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Source: LiftMaster manual, 01-39379 Rev. C, page 21.

How to Set RSL12UL Limits with a Remote Control

To set the limits using a remote control, you need a 3-button remote control that has been programmed for OPEN, CLOSE, and STOP (see programming a remote). For dual gate applications the limits must be set for each operator, and the gate MUST be attached to the operator before setting the limits and force.

Source: LiftMaster manual, 01-39379 Rev. C, page 41.

How to Program a Remote Control to the LiftMaster RSL12UL

A total of 50 Security+ 2.0 remote controls or KPW250 keypads and 2 keyless entries (1 PIN for each keyless entry) can be programmed to the operator. When programming a third keyless entry, the first keyless entry will be erased to allow the third to be programmed. When the operator's memory is full, it will exit the programming mode and the remote control will not be programmed; the memory will need to be erased before programming any additional remote controls (see Erase All Codes). If installing an 86LM to extend the range of the remote controls, DO NOT straighten the antenna.

LiftMaster describes three programming options depending on how you want the remote control to function. In each case the operator will time out of programming mode after 30 seconds.

Expected result: the operator will automatically exit learn mode (operator will beep and the green XMITTER LED will go out) if programming is successful. To program additional Security+ 2.0 remote controls or remote control buttons, repeat the programming steps.

Source: LiftMaster manual, 01-39379 Rev. C, page 22.

How to Connect the RSL12UL to the LiftMaster Internet Gateway

The LiftMaster Internet Gateway is not provided. LiftMaster describes two ways to pair it to the operator. The gateway will stay in learn mode for three minutes.

Source: LiftMaster manual, 01-39379 Rev. C, page 23.

How to Configure Additional Settings on the RSL12UL

Timer-to-Close (TTC) dial

The TIMER-TO-CLOSE dial can be set to automatically close the gate after a specified time period. The TTC is factory set to OFF. If the TTC is set to the OFF position, the gate will remain open until the operator receives another command from a control. The range is 0 to 180 seconds; 0 seconds is OFF. Any radio command, single button control, or CLOSE command on the control board prior to the TTC expiring will close the gate. The TTC is reset by any signals from the open controls, loops, close edges, and close photoelectric sensors (IR's).

Source: LiftMaster manual, 01-39379 Rev. C, page 24.

BATT FAIL and BACKDRIVE switches

• BATT FAIL: when AC power is OFF and battery voltage is critically low, the gate will latch at a limit until AC power is restored or battery voltage increases. The option select switch set to OPEN forces the gate to automatically open and then latch at the OPEN limit until AC power is restored or battery voltage increases. Set to CLOSE, it forces the gate to latch at the CLOSE limit if at the CLOSE limit or on the next CLOSE command until AC power is restored or battery voltage increases. Constant pressure on a hard command input overrides to open or close the gate. Critically low battery is less than 11.5 V.
• BACKDRIVE: set to MANUAL, the gate can be manually pushed open or closed if there is a loss of AC and battery power. Set to SECURE, the gate is difficult to push open or closed if there is a loss of AC and battery power.

Source: LiftMaster manual, 01-39379 Rev. C, page 24.

Dual gate settings

LiftMaster recommends that all accessories and board configurations are set on the primary operator. See the documentation note on bipart delay: Step 7 states that bipart delay does not apply to slide gates, while this table lists it as ON for the primary operator.

LiftMaster dual gate settings for two RSL12UL operators

Swipe sideways to see all columns.

Source: LiftMaster manual, 01-39379 Rev. C, page 37.

Constant Pressure Override (CPO)

Constant Pressure Override is for use with KPW5 and KPW250 keypads (not provided). The KPW5/KPW250 wireless commercial keypads are security keypads and can only be programmed to ONE gate operator. CPO is intended to temporarily override a fault in the entrapment protection system, in order to operate the gate until the external entrapment protection device is realigned or repaired. Use the feature only in line of sight of the gate when no obstructions to travel are present. External entrapment protection devices include LiftMaster monitored photoelectric sensors and LiftMaster monitored wired and wireless edge sensors. Be sure to repair or replace these devices promptly if they are not working properly.

1. Enter a valid 4-digit PIN.
2. Press and hold # for 5 seconds to enter CPO. Continue to hold # to keep the operator in motion. A continuous tone will sound until the limit is met and/or # is released.
3. The operator will stop when either the operator reaches a limit or the user releases #.

Gate Hold Open feature

The gate hold open feature will disable the timer and keep the gate at the open limit. It can be activated through the reset button (see Reset Switch) or through the KPW5 and KPW250 keypads (not provided). To use it from a keypad:

1. Enter a valid 4-digit PIN when the gate is at the open limit and the timer is running.
2. The operator will chirp indicating the timer is canceled.

To restart the gate: re-enter the 4-digit PIN, or activate a hard input or a programmed remote.

Source: LiftMaster manual, 01-39379 Rev. C, page 23.

How to Reset or Reprogram the RSL12UL

The following reset and erase procedures are the ones LiftMaster documents for the RSL12UL.

Source: LiftMaster manual, 01-39379 Rev. C, page 23.

Related reset procedures: deactivate the wireless dual gate feature, reset the diagnostic code history, and use the reset switch to clear the operator alarm. If the control board has just been replaced and the display shows code 36, see code 36.

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LiftMaster RSL12UL Operation

RSL12UL Control Board Overview

LiftMaster identifies these control board features (numbers match the manual's callouts on page 29):

1. SET OPEN button: sets the OPEN limit.
2. SET CLOSE button: sets the CLOSE limit.
3. MOVE GATE buttons: open or close the gate when the operator is in manual setup mode.
4. BATT FAIL switch: see BATT FAIL and BACKDRIVE.
5. LOCK/BIPART DELAY switch: used only for dual gates. See Bipart delay.
6. LEARN button: used for programming remote controls and the network.
7. TIMER-TO-CLOSE dial: see Timer-to-Close.
8. REVERSAL FORCE dial: fine tunes the force. See fine tune the force.
9. TEST buttons: operate the gate (OPEN, STOP and CLOSE).
10. STATUS LEDs: indicate the status of the operator. See the Control Board LEDs.
11. DIAGNOSTICS display: shows the operator type, firmware version, and codes. The operator type will display as "SL" followed by a "12", which indicates the operator type as RSL12UL. The firmware version will show after the operator type (example "1.2").
12. BACKDRIVE switch: see BATT FAIL and BACKDRIVE.

Source: LiftMaster manual, 01-39379 Rev. C, page 24.

How to Manually Open the RSL12UL Gate (Manual Disconnect)

1. Press the reset switch to the off position "O". This allows the gate to be opened and closed manually. On a dual gate application this must be done for both operators.
2. To resume normal operation, put the switch to the on position "I".

The reset switch is located on the front of the operator.

Source: LiftMaster manual, 01-39379 Rev. C, page 25.

RSL12UL Reset Switch

The reset switch is located on the front of the operator and serves several functions. Toggling the reset switch will stop a moving gate during a normal open/close cycle, like a stop button. The operator does not need to be reset after doing this. The reset switch will disable the gate in the present position, energize the solenoid lock for two minutes, and disable the maglock for two minutes. Pressing the reset switch also shuts off the operator alarm and resets the operator (see below).

Source: LiftMaster manual, 01-39379 Rev. C, page 25.

RSL12UL Operator Alarm

If a contact sensor detects an obstruction twice consecutively, the alarm will sound (up to 5 minutes) and the operator will need to be reset. When the inherent force of the operator detects any of the following twice consecutively, the alarm will sound up to 5 minutes and the operator will need to be reset:

• The gate is hitting an obstruction.
• The gate does not meet specifications.
• Debris is on the gate's track such as mud, rocks, dirt, etc.
• The gate has one or more broken axles or wheels.
• The gate wheel is off the gate rail.

1. Remove any obstructions or repair the gate system.
2. Press the reset switch to shut off the alarm and reset the operator.

After the operator is reset, normal functions will resume. The operator alarm will beep 3 times with a command if the battery is low (see battery problems).

Source: LiftMaster manual, 01-39379 Rev. C, page 25.

RSL12UL Remote Control Operation

Single button control (SBC) functionality: once the remote control has been programmed, the operator will operate as follows. When the gate is in the closed position, activation of the remote control button will open the gate. During the open cycle another activation will stop the gate and the next activation will close the gate. When the gate is in the open position, activation of the remote control button will close the gate. If the remote control is activated while the gate is closing, the gate will stop and the next activation will open the gate.

Single button as OPEN only: when the gate is in the closed position, activation of the remote control button will open the gate. The Timer-to-Close can be set to close the gate.

Source: LiftMaster manual, 01-39379 Rev. C, pages 22 and 25.

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LiftMaster RSL12UL Troubleshooting

This section follows the troubleshooting chart in LiftMaster's RSL12UL installation manual (document 01-39379 Rev. C). The full chart below keeps LiftMaster's wording; the problem-specific sections after it restate rows of the chart in task order and are condensed. Disconnect power (AC or solar and battery) before servicing, and have all maintenance performed by a Trained Gate Systems Technician. If the display shows a number, look it up in Diagnostic Codes first.

• Gate will not open or does not move
• Gate opens but will not close
• Operator has no power
• Remote control does not operate the gate
• Safety device problems
• Battery and charging problems
• Complete troubleshooting chart (23 symptoms)
• Control board LEDs

LiftMaster RSL12UL Troubleshooting Chart

LiftMaster RSL12UL troubleshooting chart (letters in each row correspond: cause a is checked with action a)

Swipe sideways to see all columns.

Source: LiftMaster manual, 01-39379 Rev. C, pages 34 to 36.

Gate Will Not Open or the LiftMaster RSL12UL Does Not Move

If a LiftMaster RSL12UL gate will not open or the operator does not move, LiftMaster's troubleshooting chart separates several conditions. Find the one that matches what you see.

The control board powers up, but the motor does not run

LiftMaster lists these possible causes and checks (chart row):

• Reset switch is stuck: check the reset switch.
• Stop button active or jumper not in place for the stop circuit: check the Stop button is not "stuck on", or verify that the stop button is a normally closed circuit, or put a jumper on the stop circuit.
• If on battery power only, low or dead batteries: charge the batteries by AC or solar power or replace the batteries.
• Open or Close input active: check all Open and Close inputs for a "stuck on" input.
• Entrapment protection device active: check all entrapment protection device inputs for a "stuck on" sensor.
• Vehicle loop detector or probe active: check all vehicle detector inputs for a "stuck on" detector.
• Inoperable control board: replace the inoperable control board.

The gate closes but will not open

Possible causes (chart row): an active vehicle loop detector (check all vehicle detector inputs), or low battery with the LOW BATT option set to CLOSE (check whether AC power is available; if running on batteries, battery voltage must be 11.5 Vdc or higher; charge or replace the batteries).

The operator does not respond to a command

For wired controls such as Open, Close, or SBC, see the chart row. For remotes and transmitters, see remote control problems.

The gate moves but limits cannot be set correctly

See the chart rows for "cannot set correct limits" and "does not fully open or fully close when setting limits." LiftMaster directs you to use the manual disconnect, move the gate manually, and ensure it moves easily and freely limit to limit, and, for slide gates, to ensure the gate moves at least four feet between the OPEN limit and the CLOSE limit. See How to Program Travel Limits.

Source: LiftMaster manual, 01-39379 Rev. C, pages 34 to 35.

Gate Opens but Will Not Close on the LiftMaster RSL12UL

When a LiftMaster RSL12UL gate opens but will not close with a transmitter or the Timer-to-Close, LiftMaster lists the following possible causes and checks (chart row):

• Open control active: check all Open inputs for an active input.
• Vehicle loop detector active: check all vehicle detector inputs for an active detector.
• Loss of AC power with AC FAIL set to OPEN: check AC power and the AC Fail option setting.
• Low battery with LOW BATT set to OPEN: check if AC power is available. If no AC power, the operator is running on batteries and battery voltage must be 11.5 Vdc or higher; charge the batteries by AC or solar power or replace the batteries.
• Fire Dept input active: check the Fire Dept input.
• Timer-to-Close not set: check the Timer-to-Close (TTC) setting.
• Close entrapment protection device active: check all entrapment protection device inputs for an active sensor.

If the gate stops during travel and reverses immediately, see the related chart row (active open or close control, active vehicle loop detector, or low battery voltage). If the display shows a code, see code 60 and codes 61 to 66 and 70 to 75 for entrapment protection inputs.

Source: LiftMaster manual, 01-39379 Rev. C, page 34.

LiftMaster RSL12UL Has No Power or the Display Is Off

If the LiftMaster RSL12UL does not run and the diagnostic display is not on, LiftMaster lists these possible causes and checks (chart row):

1. No power to control board: check AC and battery power.
2. Open fuse: check fuses.
3. If on battery power only, low or dead batteries: charge batteries by AC or solar power or replace batteries.
4. Inoperable control board: replace the inoperable control board.

Remember that the operator's AC power switch only turns off AC power to the control board and does not turn off battery power. For battery connections see Battery Connections. Related codes in LiftMaster's table include code 42, no battery at boot up, and code 53, brownout occurred.

Source: LiftMaster manual, 01-39379 Rev. C, pages 16, 31, and 34.

LiftMaster RSL12UL Remote Control Does Not Operate the Gate

For a wireless control or transmitter that does not operate a LiftMaster RSL12UL gate, LiftMaster lists these causes and checks (chart row):

1. Check the XMITTER LED when the wireless control is active: activate the wireless control and check that the XMITTER LED is on. Re-learn the wireless control or transmitter to the control board. Replace the wireless control as needed.
2. Stop button is active: check the Stop button is not "stuck on".
3. Reset button is stuck: check the reset button.
4. Poor radio reception: check whether a similar wired control operates correctly; check whether the wireless control works properly within a few feet of the operator; check the operator's antenna and antenna wire; check other wireless controls or devices.

To re-learn a remote, see How to Program a Remote Control. If the operator's memory is full, LiftMaster notes that the memory must be erased before more remote controls can be programmed (Erase All Codes).

Source: LiftMaster manual, 01-39379 Rev. C, pages 22 and 34.

LiftMaster RSL12UL Safety Device Problems

The LiftMaster RSL12UL will not run unless a minimum of two external entrapment protection devices are connected, one in the open direction and one in the closed direction. LiftMaster's chart covers these safety device symptoms:

• Photoelectric sensor does not stop or reverse the gate (row): check the photoelectric sensor wiring and retest that obstructing the sensor causes the moving gate to stop and may reverse direction; replace an inoperable sensor and retest.
• Edge sensor does not stop or reverse the gate (row): check the edge sensor wiring and retest that activating the edge causes the moving gate to stop and reverse direction; replace an inoperable edge sensor and retest.
• Obstruction does not cause the gate to stop and reverse (row): force adjustment is needed. Conduct the obstruction test and perform the proper force adjustment.
• Alarm sounds for 5 minutes (row): a double entrapment occurred (two obstructions within a single activation). Check for the cause and correct it, then press the reset button to shut off the alarm and reset the operator.

Diagnostic codes for entrapment protection inputs are 60, 61 to 66, 67 to 69, 70 to 75, and 80 to 84, and for inherent protection 91 and 93. Test all entrapment protection devices after any repair.

Source: LiftMaster manual, 01-39379 Rev. C, pages 31, 32, and 35.

LiftMaster RSL12UL Battery and Charging Problems

LiftMaster's guidance on RSL12UL batteries and charging:

• The operator's alarm will beep 3 times with a command if the battery is low (row). Check if AC power is available. If no AC power, the operator is running on batteries and battery voltage must be 11.5 Vdc or higher; charge the batteries by AC or solar power or replace the batteries.
• Critically low battery is less than 11.5 V. When AC power is OFF and battery voltage is critically low, the gate will latch at a limit until AC power is restored or battery voltage increases (see BATT FAIL).
• A gate that stops and reverses immediately can be caused by low battery voltage (row); battery voltage must be 11.5 Vdc or higher.
• Battery diagnostic codes: 40 (battery overvoltage), 41 (battery overcurrent), 42 (no battery at boot up). Wireless edge batteries: code 46.
• For solar operators: if the operator is not getting enough cycles per day or has insufficient standby time, see the solar rows.
• Batteries degrade over time depending on temperature and usage and do not perform well in extremely cold temperatures. LiftMaster recommends replacing them every 3 years with LiftMaster part 29-NP712 only. See Battery replacement.

The LiftMaster RSL12UL battery charge status LEDs are described under Control Board LEDs.

Source: LiftMaster manual, 01-39379 Rev. C, pages 24, 29, and 34 to 36.

RSL12UL Control Board LEDs

RSL12UL control board status LEDs

Swipe sideways to see all columns.

RSL12UL control board input LEDs

Swipe sideways to see all columns.

Source: LiftMaster manual, 01-39379 Rev. C, page 33.

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LiftMaster RSL12UL Diagnostic and Error Codes

The LiftMaster RSL12UL control board shows diagnostic codes on its display. Some codes are saved in the code history and some are not; a code that is not saved briefly appears on the display as it occurs, then disappears. LiftMaster recommends unplugging the J15 plug when cycling or disconnecting power (ac/dc) to the control board.

How to Read RSL12UL Diagnostic Codes

Source: LiftMaster manual, 01-39379 Rev. C, page 30.

LiftMaster RSL12UL Diagnostic Code Table

Each code below has its own anchor (for example code 60). The wording is LiftMaster's. LiftMaster's table is color-coded by category (LiftMaster system, installed system, informational, external entrapment protection, inherent entrapment protection); see the original table for the color key. The manual groups several codes that share one solution; they are listed separately here.

• 00
• 31
• 34
• 35
• 36
• 37
• 38
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 50
• 53
• 54
• 60
• 61
• 62
• 63
• 64
• 65
• 66
• 67
• 68
• 69
• 70
• 71
• 72
• 73
• 74
• 75
• 80
• 81
• 82
• 83
• 84
• 91
• 93
• 99

LiftMaster RSL12UL diagnostic codes (display shows 31 to 99; code 00 is listed in the manual table)

Swipe sideways to see all columns.

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LiftMaster RSL12UL Maintenance

Source: LiftMaster manual, 01-39379 Rev. C, page 28.

RSL12UL Maintenance Chart

Disconnect all power (AC, solar, battery) to the operator before servicing. The operator's AC power switch ONLY turns off AC power to the control board and DOES NOT turn off battery power. ALWAYS disconnect the batteries to service the operator.

LiftMaster RSL12UL maintenance schedule (check at least once every)

Swipe sideways to see all columns.

• Limits may have to be reset after any major drive chain adjustments.
• If lubricating chain, use only lithium spray. Never use grease or silicone spray.
• LiftMaster suggests that while at the site, voltage readings be taken at the operator. Using a digital voltmeter, verify that the incoming voltage to the operator is within ten percent of the operator's rating.

Source: LiftMaster manual, 01-39379 Rev. C, page 28.

RSL12UL Battery Replacement

Batteries will degrade over time depending on temperature and usage. The operator alarm will beep 3 times with a command if the battery is low. Batteries do not perform well in extremely cold temperatures. For best performance, LiftMaster recommends replacing the batteries every 3 years. Use only LiftMaster part 29-NP712 for replacement batteries. The batteries contain lead and need to be disposed of properly.

• The operator comes with one 7AH battery. One 33AH battery (A12330SGLPK), with the 33AH battery harness (K94-37236), may be used in place of the 7AH battery.
• To connect a replacement battery, follow the 7AH procedure or the 33AH procedure. Disconnect all power (AC, solar, battery) first.

Source: LiftMaster manual, 01-39379 Rev. C, page 29.

CTA: Shop gate operator batteries or battery back-ups from All Security Equipment. Confirm the LiftMaster part number 29-NP712 before ordering.

RSL12UL Drive Chain Maintenance

Over time, the drive chain on the operator will stretch and need to be tightened. To tighten the drive chain, adjust either of the two chain eye bolts. The chain should have no more than 1 inch of sag for every 10 feet of chain length. Limits may have to be reset after any major drive chain adjustment. If lubricating the chain, use only lithium spray; never use grease or silicone spray.

Source: LiftMaster manual, 01-39379 Rev. C, page 29.

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LiftMaster RSL12UL Repair and Replacement Parts

The tables below list the RSL12UL repair parts and part numbers as printed by LiftMaster on page 43 of manual 01-39379 Rev. C. LiftMaster lists the motor as "Motor, 1/8 HP, 12 Vdc."

Browse by category: gate operator parts | control boards | motors | batteries | covers | gate operator accessories

LiftMaster RSL12UL repair parts as listed by LiftMaster (page 43)

Swipe sideways to see all columns.

Additional RSL12UL parts listed by LiftMaster as "not shown" in the diagram (page 43)

Swipe sideways to see all columns.

Source: LiftMaster manual, 01-39379 Rev. C, page 43.

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Compatible RSL12UL Accessories

LiftMaster's manual lists the following accessories for the RSL12UL (pages 44 to 45). LiftMaster's RSL12UL product page also highlights the LOOPDETLM plug-in loop detector, the 892LT remote control, and the KPW250 wireless commercial keypad as compatible accessories. Model numbers are LiftMaster's; the links go to related All Security Equipment categories.

Entrapment Protection Devices

LiftMaster monitored devices are required for UL 325 entrapment protection (see Installing Entrapment Protection Devices). Shop photoelectric sensors and edge sensors.

• LMTBUL, monitored through beam photoelectric sensor
• LMRRUL, monitored retro-reflective photoelectric sensor
• CPS-UN4 and CPSUN4G, LiftMaster Monitored Commercial Protector System
• LMWEKITU, monitored wireless edge kit (transmitter and receiver)
• LMWETXU, monitored wireless edge transmitter
• L50 (large profile monitored edge, 82 ft. roll) and L50E (ends kit, 10 pair)
• S50 (small profile monitored edge, 82 ft. roll) and S50E (ends kit, 10 pair)
• L50CHP (plastic channel, 8 ft., pack of 10) and L50CHAL (aluminum channel, 10 ft., pack of 8)
• L504AL, L505AL, L506AL (large profile monitored edges, 4, 5, 6 ft.) and S504AL, S505AL, S506AL (small profile monitored edges, 4, 5, 6 ft.)
• WR4, WR5, WR6 (wraparound round monitored edge) and WS4, WS5, WS6 (wraparound square monitored edge)
• ETOOL, edge cutting tool

Remote Controls and Access Devices

Shop gate remote controls and keypads.

• 893MAX, 3-button remote control (includes visor clip)
• 890MAX, 3-button mini-remote control (includes key ring and fastening strip)
• 892LT and 894LT, Security+ 2.0 learning remote controls
• 878MAX, keyless entry (4-digit code keypad)
• KPW250, wireless commercial keypad (Security+ 2.0 compatible)
• STAR1000, commercial access control receiver (up to 1,000 devices)

Other RSL12UL Accessories

• 828LM, LiftMaster Internet Gateway (ASE product page)
• K1D8387-1CC, expansion board (additional programming features including external loops, plug-in loops, auxiliary relays, and inputs for additional controls and entrapment protection devices) and K94-34778, wire harness between the main control board and expansion board
• MSLM, mounting stand for Model RSL slide operators (raises the operator higher above the ground for snow and other applications)
• 86LM, remote antenna extension kit
• LOOPDETLM, plug-in loop detector (not to be used as entrapment protection) and LD7LP, loop detector mounted and wired separately inside the control box. Shop gate loop detectors.
• CP4, vehicle sensing probe
• SP10W12V and SP20W12V, solar panel kits (30W maximum for 12 Vdc operators; requires a 33AH battery harness). Shop solar panels.
• MG1300, outdoor magnetic lock kit (not for use with solar applications; must be powered separately). Shop magnetic locks.
• HTR, heater (keeps the gearbox and batteries at a suitable temperature when the outside temperature is below -4°F (-20°C); thermostat set between 45°F and 60°F (7°C and 15.5°C); powered by 110 to 250 Vac; cannot be used with a solar application)
• 40-39235 and 40-39235-1, warning signs

Batteries and Solar Hardware

• 29-NP712 and K74-30762, standard 7AH 12 Vdc battery (reuse existing harnesses)
• A12330SGLPK, 33AH 12 Vdc battery (must use INBAT33 mounting bracket)
• K94-37236, universal solar wire harness kit for 7AH and 33AH applications

Shop gate operator batteries. See the 33AH procedure and the documentation note under Battery Replacement about battery quantity.

Source: LiftMaster manual, 01-39379 Rev. C, pages 44 to 45.

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LiftMaster RSL12UL Frequently Asked Questions

Where can I find the LiftMaster RSL12UL manual?

LiftMaster publishes the RSL12UL installation manual (document 01-39379) in English, French, and Spanish on its RSL12UL product page. The English PDF is available from the original LiftMaster manual link, and this page presents its content in HTML. LiftMaster also lists a separate wiring diagram for units manufactured prior to 2022 and a troubleshooting guide for models manufactured after 2022 (see Original LiftMaster Documentation).

What gate weight and length can the RSL12UL handle?

LiftMaster's manual specifies a maximum gate weight of 800 lbs, gate travel of 25 feet minimum to 50 feet maximum, a maximum travel speed of 12 inches/second, and up to 120 cycles/day, for Class I and II vehicular slide gates. LiftMaster's RSL12UL product page describes the operator as rated for gates up to 25 ft. and 800 lbs. See Specifications and the documentation note there, and confirm the length rating with LiftMaster for your gate.

How do I program the travel limits on a LiftMaster RSL12UL?

With the gate attached to the operator, press and release SET OPEN and SET CLOSE together, move the gate to each limit with the MOVE GATE buttons and press the matching SET button, then cycle the gate open and close to set the force automatically. For slide gates the limits must be at least four feet apart. See How to Program Travel Limits and test with the obstruction test afterward.

How do I program a remote control to an RSL12UL?

Press and release the LEARN button (the green XMITTER LED lights), then, depending on the option you want, press the OPEN, CLOSE, or STOP button where LiftMaster directs, and press the remote control button to program. The operator times out of programming mode after 30 seconds and exits learn mode automatically when programming succeeds. Up to 50 Security+ 2.0 remotes or KPW250 keypads and 2 keyless entries can be stored. See How to Program a Remote Control.

What do RSL12UL diagnostic codes mean and how do I see them?

Press and hold STOP, then CLOSE, then OPEN until "Er" shows on the display; the display then shows the code sequence number ("01" is the most recent) followed by the code. Press OPEN to go to the most recent code and CLOSE to go to the oldest (up to 20 are saved). Every code is listed with LiftMaster's recommended action in the code table; for example code 60 means the minimum number of monitored entrapment protection devices is not installed.

Why will my RSL12UL gate not close?

LiftMaster lists these causes for an RSL12UL gate that opens but will not close with a transmitter or the Timer-to-Close: an active Open control, an active vehicle loop detector, loss of AC power with AC FAIL set to OPEN, low battery with LOW BATT set to OPEN, an active Fire Dept input, the Timer-to-Close not set, or an active close entrapment protection device. See Gate Opens but Will Not Close for each check.

What battery does the RSL12UL use?

The RSL12UL comes with one 12 Vdc 7AH battery. LiftMaster states to use only part 29-NP712 for replacement batteries and recommends replacing the battery every 3 years. One 33AH battery (A12330SGLPK) with the 33AH battery harness (K94-37236) may be used instead. See Battery Replacement, including the documentation note about battery quantity.

Where can I find the RSL12UL wiring diagram?

The wiring diagram is on page 42 of LiftMaster's installation manual 01-39379 Rev. C. LiftMaster also publishes a separate RSL12UL wiring diagram for units manufactured prior to 2022. See RSL12UL Wiring Diagram.

How many entrapment protection devices does the RSL12UL need?

LiftMaster requires a minimum of two independent monitored entrapment protection devices at each entrapment zone, and the operator will only operate with a minimum of two independent monitored devices in each direction: two in the open direction and two in the closed direction. The RSL12UL has one inherent device, and the installer must add at least one external device for each entrapment zone; the operator will not run unless one external device is connected in each direction. See UL 325 Entrapment Protection Requirements.

How do I manually open the RSL12UL gate?

Press the reset switch to the off position "O" (do this on both operators on a dual gate application), then move the gate by hand. Put the switch to the on position "I" to resume normal operation. Use the manual disconnect only when the gate is not moving. This is the Rev. C procedure; an earlier manual describes releasing a handle on the operator arm. See Manual Disconnect and Earlier manual revisions.

What replacement parts are available for the RSL12UL?

LiftMaster lists RSL12UL repair parts including the main board (K1D8389-1CC), motor (K76-37253), gear reducer (K32-34701-5), timing belt (K16-GT2-9), output sprocket (K15-41B16GKEH), reset switch (K180A0357), cover (K77-37857), and the 7AH battery (29-NP712). See the full list in Repair and Replacement Parts.

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Original LiftMaster RSL12UL Documentation

All documents below are hosted by LiftMaster and linked from the LiftMaster RSL12UL product page. Check that page for the current revision before relying on any document, because LiftMaster may update them.

• LiftMaster RSL12UL Installation Manual, English (01-39379 Rev. C): the document this page is based on.
• LiftMaster RSL12UL Installation Manual, French and Spanish
• LiftMaster RSL12UL Wiring Diagram (manufactured prior to 2022)
• LiftMaster UL 325 Gate Operator Troubleshooting Guide, English (models manufactured after 2022)
• LiftMaster Model RSL12UL Product Guide, English and Product Drawing
• LiftMaster Gate Operator Solar Cycle Reference Guide, English
• LiftMaster Gate Safety Checklist (Site Planning Safety Checklist)
• LiftMaster UL 325 Listed Gate Operator Feature Chart and Gate Operator Radio Technology Compatibility
• LiftMaster / Chamberlain Group product support

Warranty (LiftMaster). Per the manual, the LiftMaster warranty for the RSL12UL is a Three Year Limited Warranty; the warranty terms, including exclusions, are printed on page 46 of the manual, and warranty service starts with a call to 1-800-528-2806 before dismantling the product.

Trademark and independence notice. LiftMaster, myQ, and Security+ 2.0 are trademarks of The Chamberlain Group LLC. This HTML resource is presented by All Security Equipment, is not a LiftMaster publication, and does not replace the original manufacturer documentation.

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Related LiftMaster Resources

• LiftMaster RSL12UL product page at All Security Equipment
• Slide gate operators and LiftMaster products
• Gate operator parts, gate operator accessories, and battery back-ups
• Gate operator articles and the Help Center

Other LiftMaster slide gate operator manuals on this site: LiftMaster CSL24UL instruction manual | LiftMaster HDSL24UL instruction manual | LiftMaster INSL24UL instruction manual | LiftMaster IHSL24UL instruction manual | LiftMaster SL3000UL instruction manual