How do I fix error code E CO on a LG refrigerators?

1. undefined: Check CON101 pin 1 to pin 2 voltage. Expected: 12 V. If not 12 V, check hinge connection for looseness. If hinge is OK, replace the Main PCB. 2. undefined: Check CON101 pin 5 to pin 2 voltage. Expected: 12 V. If not 12 V, check hinge for loose connection. If hinge is OK, replace the Main PCB. 3. undefined: Check CON101 pin 3 to pin 2 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Display PCB. 4. undefined: Check CON101 pin 4 to pin 2 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Main PCB. 5. undefined: Check CON5 pin 4 to pin 3 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Display PCB. 6. undefined: Check CON5 pin 5 to pin 3 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Main PCB. 7. undefined: If all voltages are correct, explain normal operation to customer.

LG Refrigerators

Error Code E CO

Communication Error — Main MICOM and Display MICOM

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Check CON101 pin 1 to pin 2 voltage. Expected: 12 V. If not 12 V, check hinge connection for looseness. If hinge is OK, replace the Main PCB.
2
Check CON101 pin 5 to pin 2 voltage. Expected: 12 V. If not 12 V, check hinge for loose connection. If hinge is OK, replace the Main PCB.
3
Check CON101 pin 3 to pin 2 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Display PCB.
4
Check CON101 pin 4 to pin 2 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Main PCB.
5
Check CON5 pin 4 to pin 3 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Display PCB.
6
Check CON5 pin 5 to pin 3 voltage. Expected: not 0 or 5 V. If 0 or 5 V, replace the Main PCB.
7
If all voltages are correct, explain normal operation to customer.