LiftMaster RSL12U RSL12U Troubleshooting Guide Manual - Page 12

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 Code Meaning Symptom Solution The main control board has 31 experienced an internal failure. 32 Linear Drive Disengaged (Operator 1) 33 Linear Drive Disengaged (Operator 2) Gate operator will not run. Gate operator will not run and the gate moves back and forth easily. Disconnect all power, wait 15 seconds, then reconnect power (reboot). If issue continues, replace main control board. Disengage, then re-engage operator. Check wiring and connections. The operator is not receiving information from the Absolute Position Encoder (APE). 34 The operator will run for a second or two, then stop (there are no obstructions). The diagnostic display shows 34. • Check the APE sensor for a blocked diode from dust or debris. Use compressed air to clean the area. • Check the APE wire harness connections. A wire may be loose or disconnected from the harness. • Replace the APE assembly and wire harness if necessary. TEST: Attempt to run the operator. 35 Max-Run-Time Exceeded Error Product ID Error 36 The gate stops short of the programmed limit. If product ID is not present or damaged while the gate is powered it will continue to run while showing code 36. If power is lost while product ID is damaged or broken it will not run and will also show code 36. If the board was used in a different type of operator it code 36 would show as well (example board out of swing to a slide). Check for an obstruction, then reprogram the limits. Was the control board just replaced? If so, erase limits, then set limits again. If not, disconnect all power, wait 15 seconds, then reconnect power before changing product ID harness. Product ID Failure 37 If product ID is not present or damaged while gate is powered it will continue to run while showing code 37. If power is lost while product ID is damaged or broken it will not run and will also show code 37. The operator will also not be able to set limits. Unplug product ID harness then plug back in. Disconnect all power, wait 15 seconds, then reconnect power before replacing product ID harness. Hard Stop Limit (Operator 1), the The gate will reverse Reprogram the limits so they are not close to a hard 38 limit is set too close to a hard stop and the gate is stopping on intermittently. The operator may wind up a lot of tension on the the hard stop instead of the limit. chain and flex the chassis. For Hard Stop Limit (Operator 2), the dual gate installations the gates stop. TEST: Run the operator and check for code 38 on the diagnostic display. 39 limit is set too close to a hard stop and the gate is stopping on may not move in sync. This could cause a problem later on if the hard stop instead of the limit. left (nuisance reversals). Battery overvoltage 40 The operator runs faster than normal and the diagnostic display shows Code 40. Too much voltage on the battery. Check harness. Make sure you are using the recommended batteries for the operator. Check the battery voltage and battery harness. TEST: After checking the batteries, check for code 40 on the diagnostic display. Saved NO YES YES YES YES YES NO YES 11