Wine cooler runs continuously and overcools; bottles are too cold or partially frozen.

Safety first: Disconnect power before accessing sensors or the control board.

Steps to correct continuous running and overcooling:

• 1. Verify setpoint: Ensure the temperature is not set too low. Adjust to a higher value and monitor for several hours.
• 2. Compare with thermometer: Place a separate thermometer inside to confirm actual temperature versus display.
• 3. Inspect and test sensor: Access the cabinet NTC sensor and test its resistance at known temperatures. Replace if readings are incorrect or unstable.
• 4. Check wiring: Look for damaged or shorted sensor wires that could cause the board to read a falsely high temperature.
• 5. Control board relay: If the compressor runs even when the setpoint is reached and the sensor is good, the compressor relay on the main PCB may be stuck closed. Replace the main control board.