Safety: Unplug the unit before accessing sensors or control boards.

Steps to correct overcooling:

Verify setpoint: Confirm the temperature setting is appropriate for wine storage (typically 5–18°C / 41–64°F depending on model and wine type).
Check sensor placement: Locate the cabinet temperature sensor inside the compartment. Ensure it is not touching the evaporator wall or directly in the cold air stream from the fan.
Inspect sensor wiring: Look for damaged insulation or pinched wires that could cause a short and false readings.
Test the sensor: With a multimeter, measure the sensor resistance at known temperatures and compare to Haier specifications. Replace if readings are out of range.
Replace faulty components: Install a Haier-compatible cabinet temperature sensor if defective. If the sensor is good but the compressor does not cycle off, the main control PCB may need replacement.
Monitor temperature: After repairs, use an accurate thermometer to verify that the interior temperature stabilizes at the setpoint.

Wine cooler interior is too cold; bottles or labels may show signs of freezing near the back.

Possible Causes