Error Code E CO

Communication Error — communication failure between Main PCB MICOM and Display PCB MICOM

Also displayed as: E CO

How to Fix

1. 1

   Step 1: Inspect all connectors for loose connections, especially at the door hinge harness pass-through.

2. 2

   Step 2: Measure voltage at CON101 pins 1–2. Expected: 12V. If not 12V, check hinge connection for loose wiring. If hinge is secure and voltage is still wrong, replace the Main PCB.

3. 3

   Step 3: Measure voltage at CON101 pins 2–3 (data line). Expected: 0V or 5V. If not oscillating between 0V and 5V, replace the Display PCB.

4. 4

   Step 4: Measure voltage at CON101 pins 2–4 (second data line). Expected: 0V or 5V. If not correct, replace the Main PCB.

5. 5

   Step 5: Measure voltage at CON5 pins 4–6. Expected: 0V or 5V. If not correct, replace the Display PCB.

6. 6

   Step 6: Measure voltage at CON5 pins 4–8. Expected: 0V or 5V. If not correct, replace the Main PCB.

7. 7

   Step 7: If all voltages are correct, explain to customer.

This Error Applies To

LG LRFCS29D6S Series Refrigerators