LiftMaster TDC Installation Manual - English French Spanish - Page 57

Troubleshooting (continued) Code Display Message Description Possible Causes Diagnosis Resolution F61 F61 CTM FAULT Cable Tension Monitor (CTM) device triggered or missing Cable tension lost Check that CTM devices If cable tension is lost, carefully have proper cable tension resolve the issue, check that beneath the roller on the limits are set properly, and arm, and that the roller is monitor the issue to ensure it is properly riding on the cable. resolved. Ensure the cables are Ensure no binding occurs in door properly wrapped on the travel that could produce slack cable drums. cables. Improperly configured input Check system settings item in the menu to check the the setting for the CTM input. Ensure the configured number of CTM devices matches the number that are actually installed. Relearn CTM(s) if necessary. CTM wiring fault Check wiring for short or open circuit Ensure wires are wired into the correct terminals Correct wiring faults Damaged CTM device Swap CTM(s) with knowngood device Or verify CTM with multimeter on ohms range. A single CTM with the hinge open should measure 1000 Ohms (1 kOhm). When closed, a CTM should measure open-circuit. If a known-good CTM works, replace the faulty CTM Damaged powerhead main board Swap CTM(s) with knowngood CTM(s) connected directly to the powerhead main board If the main board still won't detect known-good CTM(s) connected directly to the board, the fault may exist with the main board. Attempt power cycling the unit and, failing that, resetting to factory defaults. If problem still persists, replace the main board. F62 F62 WLESS Wireless BLK edge blocked Obstruction in doorway is blocking eye or contacting edge Check for obstructions If obstructions are present, remove the obstruction Unapproved Ensure the safety device is Replace the safety device with safety device approved for use with the one that is approved for use with is being used wireless edge kit the wireless edge kit Wiring fault to Check wiring for short or safety device open circuit Correct wiring faults Damaged edge Swap safety device with known-good device If a known-good safety device works, replace the faulty safety device Damaged wireless edge transmitter Swap safety device with known-good device connected directly to the transmitter If the wireless edge still shows blocked with known-good safety devices connected directly, power cycle the operator and the wireless edge transmitter. If problem still persists, replace the transmitter. 57