Wine cooler runs continuously and becomes too cold even at higher set temperatures; no error code.

Safety: Unplug the unit before testing sensors or removing the control board.

Steps:

• Verify display: Compare the displayed temperature with an accurate thermometer inside the cabinet. If the display is much higher than actual, the sensor may be faulty.
• Test cabinet sensor: Remove and measure resistance of the cabinet NTC temperature sensor. If it reads near 0 Ω or does not change with temperature, replace it.
• Inspect control relay: On the main PCB, check the compressor relay for signs of welding or burning. A stuck relay will keep the compressor running.
• Replace control board: If the sensor is good but the compressor never shuts off, replace the main control board.

Temporary measure: Until repaired, unplug the cooler periodically to prevent overchilling valuable wine.