Wine cooler cools but temperature is unstable, with frequent swings of several degrees.

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

• Verify with a thermometer: Place a reliable thermometer in a bottle of water inside the cooler and compare readings over 24 hours to the display.
• Check loading and airflow: Avoid blocking air vents with bottles. Leave space between bottles and walls to allow circulation.
• Inspect sensor mounting: Locate the cabinet sensor and ensure it is firmly attached to the wall or evaporator surface as designed. A sensor hanging in free air can cause overshoot and oscillation.
• Replace sensor if drifting: If the display is consistently off by several degrees compared to the thermometer, replace the cabinet NTC sensor.
• Control board replacement: If a new sensor does not correct the issue, the control board’s calibration may be off and the board may need replacement.