LG Refrigerator ⚠️ Stop Using

LG Refrigerator Error Code Er CO

LG Refrigerator error code Er CO: Communication error between boards.

Last reviewed: Aug 7, 2026 Last updated: Aug 7, 2026

Methodology: Reviewed against official Lg refrigerator support guidance, then grouped by fault family before separating owner-safe checks from technician-level diagnosis.

Sources: Manufacturer fault-code sheets, service manuals, and recurring field-repair patterns.

LG Support - Refrigerator troubleshooting — Official LG support library used for refrigerator error-code and troubleshooting references.

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

Should I unplug it?

⚠️ Stop using it

Safe to leave powered off. Do not attempt to repair circuit boards without electronics experience.

Can I fix it myself?

Technician Recommended

Part: Control board / PCB

How much will it cost?

DIY: $80–$300 (board replacement)

Technician: $200–$600

⏱ 30–90 min

What Does Error Er CO Mean on Your LG Refrigerator?

LG Refrigerator error code Er CO: Communication error between boards.

What typically fails: Control board / PCB

What You're Probably Seeing

→ Error code on display
→ Temperature not maintained
→ Unit making unusual noise

Common Causes

• Internal communication or display/control fault
• Loose harness between main board and display/user interface
• Control board or display board communication issue

What to Try First

1 Unplug the refrigerator for 60 seconds then plug back in — this resets the control board and clears many temporary faults
2 Check all wiring harness connections to the main control board — reseat any loose connectors
3 If the board shows burn marks or damaged components, replacement is needed ($80–$300)
4 If the error persists after basic troubleshooting, contact a qualified appliance technician

🛠️ You'll need: Screwdriver set, Multimeter · Time: 30–90 min

💡 Try this first: Unplug the appliance for 60 seconds, then plug back in. This resets the control board and clears many temporary faults.

Questions People Also Ask

What does LG Refrigerator error code Er CO mean? ▼

Error code Er CO on a LG Refrigerator means: Communication error between boards. The appliance detected this condition and has stopped or limited operation to prevent further damage.

How do I fix LG Refrigerator error code Er CO? ▼

First, unplug the refrigerator for 60 seconds to reset the control board. If error Er CO returns, the root cause (communication error between boards) needs to be addressed — check connections, filters, and hoses before calling a technician.

Is it safe to use my LG Refrigerator with error code Er CO? ▼

It depends on the cause. Most Er CO errors mean the appliance has stopped itself as a safety measure. Check the 'Should I unplug it?' section above for specific guidance on this error.

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