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

1. undefined: Check all connectors for loose connections, especially at door hinge pass-through. 2. undefined: For Wi-Fi models: measure CON101 voltage in display — pin 16~18: expected 11.5V~12.5V; pin 16~10: expected 5V~7.5V. If absent, replace Main PCB. 3. undefined: For Wi-Fi models: measure CON101 pin 16~14 in display: should NOT be 0V or 5V. If stuck at 0V or 5V, replace Display PCB. 4. undefined: For Wi-Fi models: measure CON101 pin 16~12 in display: should NOT be 0V or 5V. If stuck at 0V or 5V, replace Main PCB. 5. undefined: For non-Wi-Fi models: measure CON101 pins 3~4: expected 11.5V~12.5V. If absent, replace Main PCB. 6. undefined: For non-Wi-Fi models: measure CON101 pins 24~3 in display: should NOT be 0V or 5V. If stuck, replace Display PCB. 7. undefined: For non-Wi-Fi models: measure CON101 pins 18~3 in display: should NOT be 0V or 5V. If stuck, replace Main PCB. 8. undefined: Measure CON5 pins 15~17 on Main PCB: should toggle 0V/5V. If stuck, replace Main PCB. 9. undefined: Measure CON5 pins 15~18 on Main PCB: should toggle 0V/5V. If stuck, replace Display PCB. 10. undefined: If all checks pass, explain to customer (possible intermittent hinge wiring issue).

LG Refrigerators

Error Code E CO

Communication Error — Connection line between Main Control Panel and Display Panel is short or open, or signal transmission fails.

Moderate

Address soon - your appliance may not work properly

Also displayed as: E CO

How to Fix

1
Check all connectors for loose connections, especially at door hinge pass-through.
2
For Wi-Fi models: measure CON101 voltage in display — pin 16~18: expected 11.5V~12.5V; pin 16~10: expected 5V~7.5V. If absent, replace Main PCB.
3
For Wi-Fi models: measure CON101 pin 16~14 in display: should NOT be 0V or 5V. If stuck at 0V or 5V, replace Display PCB.
4
For Wi-Fi models: measure CON101 pin 16~12 in display: should NOT be 0V or 5V. If stuck at 0V or 5V, replace Main PCB.
5
For non-Wi-Fi models: measure CON101 pins 3~4: expected 11.5V~12.5V. If absent, replace Main PCB.
6
For non-Wi-Fi models: measure CON101 pins 24~3 in display: should NOT be 0V or 5V. If stuck, replace Display PCB.
7
For non-Wi-Fi models: measure CON101 pins 18~3 in display: should NOT be 0V or 5V. If stuck, replace Main PCB.
8
Measure CON5 pins 15~17 on Main PCB: should toggle 0V/5V. If stuck, replace Main PCB.
9
Measure CON5 pins 15~18 on Main PCB: should toggle 0V/5V. If stuck, replace Display PCB.
10
If all checks pass, explain to customer (possible intermittent hinge wiring issue).

This Error Applies To

LG LRSOC2306 Series Refrigerators

Service manual exact match: LRSOC2306SService manual exact match: LRSOC2306VService manual exact match: LRSOC2306BService manual exact match: LRSOC2306W

Related Error Codes

E FS

Freezer Sensor Abnormal — Freezer sensor short or open failure

E UC

UV/Nano LED Module Error — Bad UV LED module or poor connection of display and UV module; caused when feedback signals are abnormal (OPTIONAL feature)

F dH

Defrost Heater Abnormal — Defrost heater or thermal fuse short circuit or unplugged connector. Indicated 4 hours after trouble occurs.

E rS

Refrigerator Sensor Abnormal — Refrigerator sensor (upper part of refrigerator compartment) short or open failure

F dS

Defrost Sensor Abnormal — Defrost sensor short or open failure

E FF

Freezer Fan Motor Abnormal — Connection line of the fan motor is faulty, short or open. Display fault when operating fan motor for 65 seconds without feedback.

E rt

Ambient (Room) Temperature Sensor Abnormal — Room temperature sensor short or open

E IK

Ice Maker Unit (Motor) Abnormal — Ice maker step motor fault, Hall IC fault, or Li-wire short; faulty motor driving circuit. Display shows error if ice maker error occurs within 30 minutes after power on.

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