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

1. undefined: Step 1: Check all wire harness connectors for loose or disconnected connections, especially at the door hinge pass-through. 2. undefined: Step 2: Measure voltage at CON101 1st pin to 2nd pin. If not 12V, check hinge connection for loose wire. If hinge is OK and still no 12V, replace Main PCB. 3. undefined: Step 3: If 12V is present, measure CON101 3rd pin to 2nd pin. If voltage is not alternating between 0V and 5V (i.e., stuck at a constant value), replace the Display PCB. 4. undefined: Step 4: Measure CON101 4th pin to 2nd pin. If voltage is not alternating between 0V and 5V, replace Main PCB. 5. undefined: Step 5: Measure CON5 4th pin to 6th pin. If not alternating 0V/5V, replace Display PCB. 6. undefined: Step 6: Measure CON5 4th pin to 8th pin. If not alternating 0V/5V, replace Main PCB. 7. undefined: Step 7: If all signals are normal, explain to customer.

LG Refrigerators

Error Code E CO

Communication Error — loss of communication between Main PCB MICOM and Display PCB MICOM; also between Transmitter and Receiver

Moderate

Address soon - your appliance may not work properly

Also displayed as: E CO

How to Fix

1
Step 1: Check all wire harness connectors for loose or disconnected connections, especially at the door hinge pass-through.
2
Step 2: Measure voltage at CON101 1st pin to 2nd pin. If not 12V, check hinge connection for loose wire. If hinge is OK and still no 12V, replace Main PCB.
3
Step 3: If 12V is present, measure CON101 3rd pin to 2nd pin. If voltage is not alternating between 0V and 5V (i.e., stuck at a constant value), replace the Display PCB.
4
Step 4: Measure CON101 4th pin to 2nd pin. If voltage is not alternating between 0V and 5V, replace Main PCB.
5
Step 5: Measure CON5 4th pin to 6th pin. If not alternating 0V/5V, replace Display PCB.
6
Step 6: Measure CON5 4th pin to 8th pin. If not alternating 0V/5V, replace Main PCB.
7
Step 7: If all signals are normal, explain to customer.

This Error Applies To

LG LRFWS2906 Series Refrigerators

Service manual exact match: LRFWS2906SService manual exact match: LRFWS2906VService manual exact match: LRFWS2906D

Related Error Codes

E Rt

Room Temperature Sensor Error — short or disconnection of room temperature sensor

F dS

Defrost Sensor Error — short or disconnection of defrost sensor

E IS

Icing Sensor Error — short or disconnection of icing sensor (ice maker sensor). Note: E IS displayed without user input indicates icing sensor fault; E IS generated by user action (pressing test switch within 1 week of ice twisting) indicates ice maker mechanical issue.

F dH

Defrost Heater Error — defrost temperature does not rise above 47°F (8°C) within expected time; caused by door gasket failure, defrost heater open, blown Fuse-M, or poor PCB relay

E FF

Freezer Fan (BLDC) Error — abnormality of BLDC fan motor for freezer; motor does not respond after 3 retry attempts (each attempt: 15s on, 10s off)

E CF

Condenser Fan (BLDC) Error — abnormality of BLDC fan motor for mechanical/condenser room

E CL

Low Side Cycle Leakage — detected by low amplitude cycle variation; caused by low-side refrigerant leak, bad compressor, or extended door-open condition

E CH

High Side Cycle Leakage — detected by high amplitude cycle variation; caused by high-side refrigerant leak, restriction in system, bad compressor, or bad valve

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