Refrigerator display shows E0 and cooling performance is reduced or intermittent.

Safety first: Unplug the refrigerator from the mains before removing any panels. Do not work on live circuits.

Steps to check and attempt a quick fix:

• Power reset: Unplug the refrigerator for 5–10 minutes, then plug it back in. This can clear temporary communication glitches.
• Inspect control connections: Remove the top rear cover (or front control cover, depending on model) to access the main control PCB and the display PCB harness. Check that all multi-pin connectors are fully seated.
• Check for corrosion or damage: Look for burnt marks, swollen capacitors, or green/white corrosion on the main control board and connectors. If present, the board should be replaced.
• Reseat harnesses: Disconnect and reconnect the wiring harness between the display PCB (in the door or front panel) and the main control PCB. Ensure the locking tabs click into place.
• Test operation: Restore power and see if the E0 code clears. If the error returns, the main control PCB or display PCB is likely defective and should be replaced by a qualified technician.

When to stop: If you smell burning, see arcing, or the board is visibly damaged, do not continue. Replace the main control PCB rather than attempting repair.