ER CO | Cooling error

Industry

Appliances

Canonical

/appliances/appliances/advanced-refrigeration/hvac/error-codes/er-co/

Last Updated

Feb 25, 2026

Summary

This code indicates that the appliance detected irregular cooling performance.

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What This Code Means

ER CO appears when internal temperature monitoring does not reflect expected cooling progression. Refrigeration and HVAC systems compare real-time temperature readings with programmed targets. If cooling thresholds are not achieved within defined timeframes, the system records this code. This reflects performance monitoring logic. It does not automatically confirm compressor failure.

Where Users Usually See This Code

On display panel
During active cooling
After temperature fluctuation

Why This Code Appears

Cooling rate below expected level
Temperature not decreasing as programmed
Monitoring threshold exceeded

What Typically Happens Next

Cooling performance may be reduced
Alarm may sound
Code remains displayed

What This Code Is Not

It is not a defrost heater error
It is not a communication issue
It is not a door latch malfunction

Troubleshooting Checklist

□ Monitor temperature stability
□ Restart appliance
□ Observe recurrence

Notes And Edge Cases

High ambient temperatures may influence cooling rate readings.

Related Codes

8 links

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