LiftMaster TDC Installation Manual - English French Spanish - Page 55

Troubleshooting (continued) Code Display Message F42 F42 EYE/ EDG1 MIS F45 F45 EYE/ F48 EDG2 MIS F48 EYE/ EDG3 MIS F43 F43 EYE/ F46 EDG1 BLK F49 F46 EYE/ EDG2 BLK F49 EYE/ EDG3 BLK Description Monitored eyes/ edges 1/2/3 learned, but no longer detected as present. Monitored eyes/ edges 1/2/3 were blocked or missing when the door was commanded to move. Possible Causes Diagnosis Resolution Certain safety devices may show as missing when they are blocked, even if they are present and functioning See F41/F44/F47 errors: safety device blocked Ensure only safety devices approved for use with the operator are used. Correct blocked safety device condition Improperly configured photoeye input Check system settings item in the menu to check the device type setting for the input Ensure the safety device type matches the device that is actually installed Unapproved safety device is being used Ensure the safety device is approved for use with the operator Replace the safety device with one that is approved for use with the operator Wiring fault to safety device Check for LED status on photoeye type devices. Correct wiring faults Check wiring for short or open circuit Damaged photo eyes or edge Ensure wires are wired into correct terminals and that polarity is correct for polarity-sensitive devices Swap safety device with known-good device Damaged powerhead main board Swap safety device with known-good device connected directly to the powerhead main board If a known-good safety device works, replace the faulty safety device If the main board still won't detect knowngood safety devices connected directly to the board, power cycle the operator. If the problem persists, reset to factory defaults and configure again. See sections for F41/F42/F44/ F45/F47/F46 as applicable If problem still persists, replace the powerhead main board. - 55