er ch
Moderate
LG · Refrigerators
Communication Error (Internal Boards)
Quick Answer
Error code Er CH on your LG Refrigerators means: Communication Error (Internal Boards). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Unplug the refrigerator for 5 minutes to reset all boards
2
If the error returns, access the main control board and inverter board to inspect wire harness connections
3
Check all connectors for firm seating and inspect wires for damage
4
Test voltage outputs on the main control board to the inverter board per service manual specifications
5
Replace the inverter board if the main control board output is normal but the inverter is not responding
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Inverter board (model-specific LG part)
Main control board (model-specific LG part)
Communication wire harness
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