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

1. undefined: Check hinge wiring harness connection between main body and door; reconnect if loose. 2. undefined: Measure voltage at CON101 1st Pin to 2nd Pin; expected 12V. If not 12V, check hinge connection; if hinge is good, replace Main PCB. 3. undefined: Measure voltage at CON101 5th Pin to 2nd Pin; expected 12V. If not 12V, check hinge connection; if hinge is good, replace Main PCB. 4. undefined: Measure voltage at CON101 3rd Pin to 2nd Pin; expected active signal (not fixed 0 or 5V). If fixed, replace Display PCB. 5. undefined: Measure voltage at CON101 4th Pin to 2nd Pin; expected active signal (not fixed 0 or 5V). If fixed, replace Main PCB. 6. undefined: Measure voltage at CON5 4th Pin to 3rd Pin; expected active signal (not fixed 0 or 5V). If fixed at 0 or 5V, replace Display PCB. 7. undefined: Measure voltage at CON5 5th Pin to 3rd Pin; expected active signal (not fixed 0 or 5V). If fixed, replace Main PCB. 8. undefined: If all voltages check out, explain normal operation to customer.

LG Refrigerators

Error Code E CO

Communication error between main MICOM and display MICOM

Moderate

Address soon - your appliance may not work properly

Also displayed as: E CO

How to Fix

1
Check hinge wiring harness connection between main body and door; reconnect if loose.
2
Measure voltage at CON101 1st Pin to 2nd Pin; expected 12V. If not 12V, check hinge connection; if hinge is good, replace Main PCB.
3
Measure voltage at CON101 5th Pin to 2nd Pin; expected 12V. If not 12V, check hinge connection; if hinge is good, replace Main PCB.
4
Measure voltage at CON101 3rd Pin to 2nd Pin; expected active signal (not fixed 0 or 5V). If fixed, replace Display PCB.
5
Measure voltage at CON101 4th Pin to 2nd Pin; expected active signal (not fixed 0 or 5V). If fixed, replace Main PCB.
6
Measure voltage at CON5 4th Pin to 3rd Pin; expected active signal (not fixed 0 or 5V). If fixed at 0 or 5V, replace Display PCB.
7
Measure voltage at CON5 5th Pin to 3rd Pin; expected active signal (not fixed 0 or 5V). If fixed, replace Main PCB.
8
If all voltages check out, explain normal operation to customer.

This Error Applies To

LG LF29S8330 Series Refrigerators

Service manual exact match: LF29S8330SService manual exact match: LF29S8330BService manual exact match: LF29S8330WService manual exact match: LF29S8330D