LiftMaster RSW12UL Swing Gate Operator Manuals & Support

The LiftMaster RSW12UL is a 12 VDC swing gate operator for residential and light commercial gates up to 16 ft or 1,000 lb. It opens 90° in about 15 seconds and is rated for 250 cycles per day.

Battery backup is standard, with up to 147 cycles or 63 days of standby. It has a 900:1 oil-bath worm gear, electronic limits, Security+ 2.0 radio, myQ and solar capability.

Buy the RSW12UL

Identify your model

The RSW12UL is a pad or post mount operator with a 2-piece cover. It requires a LiftMaster external entrapment protection device before it will run.

Key specs

Max gate	1,000 lb / 16 ft
Open time	About 15 seconds to 90°
Motor	12 VDC, soft start and stop
Duty	250 cycles per day
Power	115 VAC single phase, or solar
Battery backup	Up to 147 cycles or 63 days standby
Gear reduction	900:1 worm gear in oil bath
Accessory power	12 VDC, 500 mA
UL 325 usage class	Class I, II, III and IV
Operating temperature	-4 to 140 °F; -40 °F with heater

Manuals and documents

Troubleshooting

To see codes, press and hold STOP, then CLOSE, then OPEN until "Er" shows on the diagnostic display. The display shows each saved code in order, starting with the most recent (01), up to 20 codes. Press STOP to exit.

Safety device codes

60: the minimum monitored devices are not installed. A swing gate needs at least one external device in the open or close direction.
61 to 66: a photo eye or edge was held more than 3 minutes. Check alignment, wiring and obstructions.
70 to 75: a photo eye or edge tripped and reversed the gate. If nothing was in the way, check alignment, inputs and wiring.

Travel and motor codes

35: max run time exceeded. Check for an obstruction, then reprogram the limits.
50: run distance error. Check the limit positions and that the switches work.
91: force reversal. Check that the gate moves freely, then recheck the force setting.
93: RPM or stall reversal. Check the operator wiring and the APE encoder assembly.

Power and battery codes

31: board failure. Remove all power for 15 seconds, then reconnect. Replace the board if it comes back.
40 or 41: battery overvoltage or overcurrent. Make sure the battery voltage matches the system and check the charge harness.
42: no battery at boot up. Check connections. Replace batteries that read below 20 V on a 24 V system.
53: brownout. Check the supply wiring.

Loop and dual gate codes

43 to 45: exit, shadow or interrupt loop error on a LiftMaster plug-in detector. Check the loop for a short or open.
54: lost wireless link to the second operator. Check its power, then relearn the second operator.

Common questions

It needs at least one monitored external device in the open or close direction. Use LiftMaster monitored photo eyes or edges, such as the LMRRUL, LMTBUL or S505AL. Code 60 shows on the display until they are connected.

Press and hold STOP, then CLOSE, then OPEN until "Er" shows. Use OPEN and CLOSE to scroll through the last 20 codes, and press STOP to exit.

Up to 147 cycles or 63 days of standby after a power loss.

It has a Security+ 2.0 three-channel receiver for up to 50 remotes, such as the 811LM and 893MAX. Use the 811LMX or 813LMX for unlimited remotes.