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

1. undefined: 1. Check for loose connections at all harness connectors between Main PCB and Display PCB. 2. undefined: 2. Check hinge connections for loose wiring. 3. undefined: 3. Measure voltage at CON101 7th Pin to 6th Pin — should be 12V. If not, replace Main PCB. 4. undefined: 4. Measure voltage at CON101 3rd Pin to 6th Pin — should be 5V. If not, replace Main PCB. 5. undefined: 5. Measure voltage at CON101 5th Pin to 6th Pin — should NOT be 0V or 5V (expected Not OV/5V). If OV or 5V, replace Display PCB. 6. undefined: 6. Measure voltage at CON101 4th Pin to 6th Pin — should NOT be 0V or 5V. If OV or 5V, replace Main PCB. 7. undefined: 7. Measure voltage at CON6 8th Pin to 9th Pin — should NOT be 0V or 5V. If OV or 5V, replace Display PCB. 8. undefined: 8. Measure voltage at CON6 10th Pin to 9th Pin — should NOT be 0V or 5V. If OV or 5V, replace Main PCB. 9. undefined: 9. If all checks pass, explain to customer.

LG Refrigerators

Error Code CO E

Communication Error (Main PCB to Display PCB)

Moderate

Address soon - your appliance may not work properly

How to Fix

1
1. Check for loose connections at all harness connectors between Main PCB and Display PCB.
2
2. Check hinge connections for loose wiring.
3
3. Measure voltage at CON101 7th Pin to 6th Pin — should be 12V. If not, replace Main PCB.
4
4. Measure voltage at CON101 3rd Pin to 6th Pin — should be 5V. If not, replace Main PCB.
5
5. Measure voltage at CON101 5th Pin to 6th Pin — should NOT be 0V or 5V (expected Not OV/5V). If OV or 5V, replace Display PCB.
6
6. Measure voltage at CON101 4th Pin to 6th Pin — should NOT be 0V or 5V. If OV or 5V, replace Main PCB.
7
7. Measure voltage at CON6 8th Pin to 9th Pin — should NOT be 0V or 5V. If OV or 5V, replace Display PCB.
8
8. Measure voltage at CON6 10th Pin to 9th Pin — should NOT be 0V or 5V. If OV or 5V, replace Main PCB.
9
9. If all checks pass, explain to customer.