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

1. undefined: Check for loose connection at CON101 on display PCB 2. undefined: Check voltage between Red to White/Red wires at CON101: 12V = go to step 3; other = check hinge for loose connection or change Main PCB 3. undefined: Check voltage between White/Red to Orange at CON101: 0V or 5V = change Display PCB; other = go to step 4 4. undefined: Check voltage between White/Red to White/Black at CON101: 0V or 5V = change Main PCB; other = go to step 5 5. undefined: Check for loose connection at CON5 on Main PCB; check voltage between Orange to Red/White: 0V or 5V = change Display PCB; other = go to step 6 6. undefined: Check voltage between White/Red to White/Black at CON5 on Main PCB: 0V or 5V = change Main PCB; other = explain to customer

LG Refrigerators2020–present

Error Code E CO

Communication Error between Main PCB MICOM and Display MICOM

Moderate

Address soon - your appliance may not work properly

What This Means

Loose connection at CON101 (display PCB connector); Faulty hinge wire harness (loose connection through hinge); Failed display PCB; Failed main PCB; Poor transmitter/receiver (Tx/Rx) circuit

How to Fix

1
Check for loose connection at CON101 on display PCB
2
Check voltage between Red to White/Red wires at CON101: 12V = go to step 3; other = check hinge for loose connection or change Main PCB
3
Check voltage between White/Red to Orange at CON101: 0V or 5V = change Display PCB; other = go to step 4
4
Check voltage between White/Red to White/Black at CON101: 0V or 5V = change Main PCB; other = go to step 5
5
Check for loose connection at CON5 on Main PCB; check voltage between Orange to Red/White: 0V or 5V = change Display PCB; other = go to step 6
6
Check voltage between White/Red to White/Black at CON5 on Main PCB: 0V or 5V = change Main PCB; other = explain to customer