Display works but temperature reading does not change over time, even when the interior clearly warms or cools.

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

Steps to correct:

• Compare with thermometer: Place an accurate thermometer inside and compare to the displayed temperature.
• Inspect sensor: Access the cabinet thermistor and check for damage or disconnection.
• Test resistance: Measure thermistor resistance at two different temperatures (e.g., room temperature and after cooling). If readings do not change, replace the sensor.
• Control board: If a new sensor does not resolve the issue, the main PCB's sensor input may be faulty and require replacement.