Safety: Always disconnect power before cleaning coils or accessing rear components.

Steps to address E9:

Check door and loading: Ensure the door closes fully and is not blocked by bottles. Avoid overloading shelves which can restrict airflow.
Allow recovery: If the door was left open, close it and allow 12–24 hours for temperature to stabilize. Clear the error if the model allows.
Clean condenser: Remove the toe-kick or rear panel and gently vacuum or brush dust from the condenser coils. Blocked coils cause overheating and poor cooling.
Verify fan operation: Confirm that the condenser fan runs when the compressor is on. Replace the fan motor if it does not run and has proper voltage.
Sensor check: If the unit is cooling properly but still shows E9, test the cabinet temperature sensor and replace if out of spec.
Sealed system issues: If the compressor runs continuously, coils are clean, fans operate, but the unit cannot reach set temperature, a refrigerant leak or compressor problem is likely. This requires a professional technician.

Wine cooler shows E9; temperature may fluctuate widely or unit may shut down cooling.

Possible Causes