Error Code CO E

Communication Error (Display PCB to Main PCB)

Also displayed as: CO E

How to Fix

1. 1

   Check for loose connection at CON101 on the Display PCB.

2. 2

   Measure voltage between Red and Blue wires at CON101: should be approximately 12V DC.

3. 3

   If not 12V: Check hinge wiring for loose connection — if still not 12V, replace Main PCB.

4. 4

   Measure voltage between Blue and Yellow wires at CON101: if 0V or 5V, replace the Display PCB.

5. 5

   If voltage is within normal range: Measure voltage between Blue and Purple wires at CON101.

6. 6

   If 0V or 5V on Blue-to-Purple: Replace the Main PCB.

7. 7

   If all Display-side voltages normal: Check CON5 on Main PCB — measure voltage between Blue and Yellow wires at CON5.

8. 8

   If 0V or 5V on CON5 Blue-to-Yellow: Replace the Display PCB.

9. 9

   Measure voltage between Blue and Purple at CON5 (Drawer Model): if 0V or 5V, replace the Main PCB.

10. 10

    If all voltages pass: Explain findings to customer — possible intermittent wiring issue at hinge area.

This Error Applies To

LG LFCS22520B Series Refrigerators