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 BO/WH and PK/BL wires at CON101: if 5V, go to next step; if other, check hinge connection — if still other, replace Main PCB 3. undefined: Check voltage between PK/BL and PR/WH wires at CON101: if 0V or 5V, replace Display PCB; if other, continue 4. undefined: Check voltage between PK/BL and ground at CON5: if 0V or 5V, replace Main PCB; if other, continue 5. undefined: Check for loose connection at CON5 on main PCB 6. undefined: Check voltage between PR/BL and PK/BL: if 0V or 5V, replace Display PCB; if other, continue 7. undefined: Check voltage between RD/YL and PK/BL: if 0V or 5V, replace Main PCB; if other, explain to customer

LG Refrigerators2023–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 on display PCB; Poor communication line connection; Defective transmitter or receiver transistor between display and main board; Defective display PCB; Defective main PCB

How to Fix

1
Check for loose connection at CON101 on display PCB
2
Check voltage between BO/WH and PK/BL wires at CON101: if 5V, go to next step; if other, check hinge connection — if still other, replace Main PCB
3
Check voltage between PK/BL and PR/WH wires at CON101: if 0V or 5V, replace Display PCB; if other, continue
4
Check voltage between PK/BL and ground at CON5: if 0V or 5V, replace Main PCB; if other, continue
5
Check for loose connection at CON5 on main PCB
6
Check voltage between PR/BL and PK/BL: if 0V or 5V, replace Display PCB; if other, continue
7
Check voltage between RD/YL and PK/BL: if 0V or 5V, replace Main PCB; if other, explain to customer