Wine cooler runs constantly and is too cold, bottles freezing or forming ice crystals

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

Steps:

• Verify set temperature: Ensure the setpoint is appropriate for wine (typically 5–18°C / 41–64°F depending on type).
• Check with a thermometer: Place an accurate thermometer inside to compare actual temperature to display. Large differences suggest sensor or control issues.
• Inspect and test sensor: Locate the cabinet NTC sensor and measure resistance at known temperatures. Replace if readings are out of Bosch specification.
• Control board evaluation: If the sensor is good but the compressor never cycles off, the compressor relay on the main PCB may be stuck closed. Replace the main control board.