Display shows temperature but does not change even as the interior warms or cools.

Safety: Unplug the cooler before accessing sensors.

• Verify with a thermometer: Place a separate thermometer inside and compare to the displayed value over time.
• Inspect for ice: Remove the interior rear panel and check if the thermistor is encased in ice. Defrost the unit fully.
• Check sensor connection: Ensure the thermistor plug is firmly connected to the control board.
• Test sensor resistance: Measure resistance at different temperatures (e.g., room temperature vs. cooled). If resistance does not change, replace the thermistor.
• Control board replacement: If a new sensor does not resolve the issue, the control board's measurement circuit may be defective and require replacement.