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

1. undefined: Check all harness connections between Main PCB and Display PCB. 2. undefined: Measure voltage at CON101 pins 5~4. Expected 12V. If not 12V, check the hinge connection (loose) or replace Main PCB. 3. undefined: Measure voltage at CON101 pins 1~4. Expected 5V. If not 5V, check hinge connection (loose) or replace Main PCB. 4. undefined: Measure voltage at CON101 pins 2~4. If fixed at 0V or 5V (not variable), replace the Display PCB. 5. undefined: Measure voltage at CON101 pins 3~4. If fixed at 0V or 5V (not variable), replace the Main PCB. 6. undefined: Measure voltage at CON5 pins 12~11. If fixed at 0V or 5V, replace the Display PCB. 7. undefined: Measure voltage at CON5 pins 14~11. If fixed at 0V or 5V, replace the Main PCB. 8. undefined: If all voltage checks pass, explain normal operation to customer.

LG Refrigerators2020–present

Error Code E CO

Communication Error — loss of communication between Main PCB Micom and Display PCB Micom

Moderate

Address soon - your appliance may not work properly

Also displayed as: E CO

How to Fix

1
Check all harness connections between Main PCB and Display PCB.
2
Measure voltage at CON101 pins 5~4. Expected 12V. If not 12V, check the hinge connection (loose) or replace Main PCB.
3
Measure voltage at CON101 pins 1~4. Expected 5V. If not 5V, check hinge connection (loose) or replace Main PCB.
4
Measure voltage at CON101 pins 2~4. If fixed at 0V or 5V (not variable), replace the Display PCB.
5
Measure voltage at CON101 pins 3~4. If fixed at 0V or 5V (not variable), replace the Main PCB.
6
Measure voltage at CON5 pins 12~11. If fixed at 0V or 5V, replace the Display PCB.
7
Measure voltage at CON5 pins 14~11. If fixed at 0V or 5V, replace the Main PCB.
8
If all voltage checks pass, explain normal operation to customer.

This Error Applies To

LG LRMVS3006D Series Refrigerators (2020) (2020–present)

Service manual exact match: LRMVC2306SService manual exact match: LRMVC2306DService manual exact match: LRMDS3006DService manual exact match: LRMDS3006SService manual exact match: LRMVS3006DService manual exact match: LRMVS3006SService manual exact match: LRMDC2306SService manual exact match: LRMDC2306D

Related Error Codes

E FS

Freezer Sensor Error — short or open circuit in the freezer thermistor

E rS

Refrigerator Sensor Error — short or open circuit in the fresh food compartment thermistor

F dS

Freezer Defrost Sensor Error — short or open circuit in the freezer defrost sensor

r dS

Refrigerator Defrost Sensor Error — short or open circuit in the refrigerator defrost sensor

E HS

Humidity Sensor Error — short or open circuit in the humidity sensor

E CS

Convertible (Pantry/Full Convert) Sensor Error — short or open circuit in the pantry drawer sensor

E rt

Room Temperature Sensor Error — short or open circuit in the ambient room temperature sensor

E IS

Icing Sensor Error — short or open circuit in the icing compartment (in-door icemaker) sensor

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