LiftMaster GH GT- Logic 4 Installation Manual - Page 39

TROUBLESHOOTING ERROR CODES Logic 4.0 operators incorporate a self diagnostic feature built into the MAS LED. In addition to indicating when routine maintenance is due, the MAS LED can be used to troubleshoot some problems with the operator. If the MAS LED is flashing on and off rapidly, the Maintenance Alert System has been triggered and the schedule operator service is due. If the MAS LED flashes 2 or more pulses in a row followed by a pause, an operator error has occurred. To view how many errors currently exist, turn the selector dial to DIAGNOSTIC and press the OPEN button. To read out each individual error code (if more than one exists) press CLOSE. It is possible to have more than one error at a time. The chart below can assist with identifying the flashes on the MAS LED. ERROR CODE E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 DISPLAY 1 blink 2 blinks DESCRIPTION MAS triggered (cycles or months) No RPM input during opening 3 blinks (MRT) Maximum Run Time timed out 4 blinks Obstruction sensed on closing 5 blinks 6 blinks 7 blinks 8 blinks Stuck button pressed for greater than 2 minutes Invalid option card plugged into option card receptacles LiftMaster Monitored Entrapment Protection (LMEP) device faulted or removed for greater than 2 minutes Brownout Detected Flash on start of Motor movement at invalid time movement 10 blinks Motor Phase Jumper changed while unit is not in programming mode EFFECT CORRECTION None normal operation Reset MAS (page 32). The door only responds to constant pressure commands Clutch is slipping, adjust clutch, or verify RPM sensor connection or replace RPM sensor. NOTE: To relearn the RPM sensor, move the door with a constant pressure command. The door will stop once relearned and normal operation will resume. The door stops before reaching set open or close limit(s) First check Operator for any faults (i.e., Bad Limit switch), manually learn Max Run Timer (page 35) OR reset factory defaults (page 35). Operator will reverse to OPEN position Cleared by removing obstruction or realigning photoelectric sensors and giving a close command. Stuck button on 3-button station Stuck button must be unstuck will not respond before it will be recognized as an input. Option card will not function properly Refer to accessories page for list of supported option card(s). Normal operation (5 second constant pressure override required to close) Cleared when safety device is cleared or connected. Operator will run as long as enough power is present Operator will continue to function normally for 5 operations and then default to a constant pressure mode The phase will not change 1. Check AC line for voltage. 2. Check transformer secondary for low voltage. Too many accessories may be connected to the transformer. Check relays and the drive circuitry to ensure that they are turning off. Operator must know that they are turning off. Operator must run correctly for two starts for the error to be cleared. Enter programming mode and move phase jumper to change phase. TROUBLESHOOTING NOTE: Error codes take priority over normal MAS LED operation. Error codes will repeat on the MAS every 1.5 seconds until cleared. There may be more than one error present, but only the highest priority will flash. If the highest error is cleared, the next highest will flash. All errors self-correct when the corrective action is taken and a reset is not needed. Troubleshooting error codes 39