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

1. undefined: Check all connectors (CON101, CON5) for loose connections. Reconnect if loose. 2. undefined: Measure voltage at CON101 7th pin to 6th pin. Should be 12V. If not 12V, check hinge connections for loose contact then replace Main PCB if hinge is OK. 3. undefined: Measure voltage at CON101 3rd pin to 6th pin. Should be 5V. If not 5V, replace Main PCB. 4. undefined: Measure voltage at CON101 5th pin to 6th pin. Should be varying (not fixed 0V or 5V). If fixed 0V or 5V, replace Display PCB. 5. undefined: Measure voltage at CON101 4th pin to 6th pin. Should be varying (not fixed 0V or 5V). If fixed 0V or 5V, replace Main PCB. 6. undefined: Measure voltage at CON5 4th pin to 6th pin. Should be varying. If fixed, replace Display PCB. 7. undefined: Measure voltage at CON5 4th pin to 8th pin. Should be varying. If fixed, replace Main PCB. 8. undefined: If all voltages check out, explain normal operation to customer.

LG Refrigerators2017–present

Error Code CO E

Q: What does error code CO E mean on a LG refrigerators?

Communication Error between Main PCB and Display Micom Poor communication connection; Poor transistor (TR) on transmitter/receiver; Loose hinge connection; Loose CON101 or CON5 connector

Communication Error between Main PCB and Display Micom

Moderate

Address soon - your appliance may not work properly

Also displayed as: CO E

What This Means

Poor communication connection; Poor transistor (TR) on transmitter/receiver; Loose hinge connection; Loose CON101 or CON5 connector

How to Fix

1
Check all connectors (CON101, CON5) for loose connections. Reconnect if loose.
2
Measure voltage at CON101 7th pin to 6th pin. Should be 12V. If not 12V, check hinge connections for loose contact then replace Main PCB if hinge is OK.
3
Measure voltage at CON101 3rd pin to 6th pin. Should be 5V. If not 5V, replace Main PCB.
4
Measure voltage at CON101 5th pin to 6th pin. Should be varying (not fixed 0V or 5V). If fixed 0V or 5V, replace Display PCB.
5
Measure voltage at CON101 4th pin to 6th pin. Should be varying (not fixed 0V or 5V). If fixed 0V or 5V, replace Main PCB.
6
Measure voltage at CON5 4th pin to 6th pin. Should be varying. If fixed, replace Display PCB.
7
Measure voltage at CON5 4th pin to 8th pin. Should be varying. If fixed, replace Main PCB.
8
If all voltages check out, explain normal operation to customer.

This Error Applies To

LG LMXS28626S Series Refrigerators (2017) (2017–present)

Service manual exact match: LMXS28626SService manual exact match: LMXS28626DService manual exact match: LMXS28626WService manual exact match: LMXS28626BService manual exact match: LFXS28566SService manual exact match: LFXS28566DService manual exact match: LFXS28566WService manual exact match: LFXS28566B+2 more