Dometic RV Air Conditioner Freeze Control Thermistor Sensor
Updated June 17, 2026
This thermistor sensor is a replacement part for Dometic RV air conditioners. It monitors the evaporator coil temperature and signals the control board to prevent ice buildup, ensuring efficient cooling and preventing random shutdowns due to freeze protection.
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How It Works
The thermistor is a temperature-sensitive resistor that changes resistance with temperature. It is mounted on the evaporator coil. When the coil temperature approaches freezing, the thermistor sends a signal to the AC control board to cycle the compressor off, preventing ice formation. When the coil warms, it allows the compressor to restart.
Common Failure Symptoms
A failing thermistor can cause the air conditioner to run continuously without cooling, shut down randomly, or fail to start. Ice may form on the evaporator coil, reducing airflow and cooling performance. The unit may also cycle on and off frequently.
Installation Notes
Installation typically involves locating the old thermistor on the evaporator coil, disconnecting the wire harness, and connecting the new thermistor. Ensure the sensor is securely attached to the coil for accurate temperature sensing. The part includes a wire harness for easy replacement. Always disconnect power before servicing.
