LiftMaster JDC Installation Manual - English French Spanish - Page 56

Troubleshooting (continued) Code Display Message Description Possible Causes Diagnosis Resolution F51 F51 INP1 Unmonitored Obstruction Check for obstructions If obstructions are present, remove F52 BLOCK eye/edge in doorway the obstruction F52 INP1 device is blocking F53 CMND triggered for unmonitored F54 3 minutes eye/edge F53 INP2 or more on device F55 BLOCK input 1/2/3/4, F56 F54 INP2 or blocked Improperly CMND when door configured F57 motion was input F58 F55 INP3 requested Check system settings item in the menu to check the device type setting for the input Ensure the device type matches the device that is actually installed BLOCK F56 INP3 CMND Incompatible device is being used INP1/2/3/4 inputs are compatible with drycontact type devices. If the device is incompatible, replace with one that is, or move the device to another input which is compatible F57 INP4 BLOCK F58 INP4 Ensure the device being used is a dry-contact type device. with the device CMND Wiring fault to Check wiring for short or Correct wiring faults device open circuit Ensure wires are wired into correct terminals Damaged device Swap device with known- If a known-good device works, good device replace the faulty device Damaged powerhead main board Disconnect unmonitored If the main board still detects eye/edge. Open circuit an obstruction with no device condition is equivalent to an connected, power cycle the unobstructed unmonitored operator. eye/edge device. If the problem persists, reset to factory defaults and configure again. If problem still persists, replace the powerhead main board. 56