LiftMaster RSL12U RSL12U Troubleshooting Guide Manual - Page 13

DIAGNOSTIC CODES Some codes are saved in the code history and some are not. If a code is not saved it will briefly appear on the display as it occurs, then disappear. When servicing of the operator is complete, erase the code history by pressing the STOP button until the display flashes "Er" then "CL" (about 6 seconds). When the codes have been erased the display will show "_ _". LIFTMASTER SYSTEM INSTALLED SYSTEM Code Meaning Battery overcurrent 41 No battery at boot up 42 Exit Loop Error 43 Shadow Loop Error 44 45 Interrupt Loop Error Wireless edge battery low 46 Fault detected in the 47 power board. Symptom Solution Code 41 will show up on the Possible short of the battery charge harness. Check harness. diagnostic display. There will Make sure the recommended battery(ies) are being used. Make possibly be low battery voltage sure you do NOT have a 12V battery on a 24V system. Check (the LOW BATT LED will be on). battery fuse. Operator will run and the diagnostic display will show Code 42 with power cycle or boot-up. The operator will not run on battery backup after power loss. TEST: After checking the batteries, check for code 41 on the diagnostic display. Check the battery connections at the main control board and at the battery terminals. Make sure the J15 plug is plugged into the board. Replace batteries if depleted to less than 20V on a 24V system or less than 10V on a 12V system. Make sure there is NOT a single 12V battery on a 24V system. TEST: After checking the batteries, check for code 42 on the diagnostic display. Gate will lock in the open position or closed position (depending on the dip switch setting). The exit loop will not be functional and diagnostic display will show Code 43. All Operators: Gate will not close. LiftMaster Plug-in Loop Detector only. Failure or missing loop. Check loop wiring throughout connection. May be a short in the loop, or an open connection in the loop. Models LA400U, LA412U, LA500U, RSW12U: Gate will not open. Gate will not close. The operator will beep 2 times with a command. Critically low battery will cause gate to latch open or closed depending on the board settings (Batt Fail switch settings on DC operator control board and Exit Fail switch setting on the AC operator expansion board). Operator will not run. Replace batteries in wireless edge. Replace the power board. Saved YES YES YES YES YES Run-Distance Error Gate will stop prior to reaching DC Operators: Gate unbalance detected. Make sure the gate is the desired limit setting. installed on a level surface and not on an excessive grade. 50 AC Operators: The limits are less than the minimum YES requirement or longer than what was learned. Check limit positions and proper switch function. Run-distance can be re-learned by setting the handing again. 51 Pass-point not detected (Operator 1) Operator runs at a constant slow speed. Check yellow pass-point wiring. If limits are not accurate, reprogram. NO 52 Pass-point not detected (Operator 2) Brownout occurred 53 Operator will run and show code 53. AC/DC board supply dipped below allowable level. Review power supply and wiring. If rebooting, ensure enough time for YES discharge of power to force a fresh boot. Wireless Second Only the commanded operator Check the second operator for power. If OFF, restore power and 54 Operator Communication will respond. try to run the system. If powered, deactivate the wireless YES Error feature and then reprogram the second operator. 12 LIFTMASTER SYSTEM INFORMATIONAL