Communication Error Between Electronic Boards — Solutions
This specific error means the data signal between two boards (commonly the main PCB and the display/user interface board, or the main PCB and the inverter) has been interrupted.
Signals
- Blank or garbled display
- Features not responding to button presses
- Ice maker or dispenser unresponsive despite no individual component failure
- Error code referencing COMMs, CE, or similar
Solutions
- Power cycle the refrigerator — the most effective first step for intermittent communication faults.
- Reseat all harness connectors — even a slightly loose connector can break a data signal under vibration.
- Inspect the ribbon cable (on models with a display-panel ribbon) — cracks or folds in the ribbon cause communication loss to the display.
- Test each board — a technician can use service mode diagnostics to identify which board is failing to communicate.
- Replace the faulty board — order by model number; both the main board and the display board are individually replaceable.