RV AC Thermistor Dometic - Freeze Control Sensor Replacement Freeze Control Thermistor Fitment: Replacement for Dometic A/C 579, 590, 591, 595, 600 and 630 series Air Conditioner Freeze Control Sensor - 33260 Package Included: 2 x RV AC thermistor control sensors. Replacement for Dometic A/C models 579, 590, 591, 595, 600, and 630 series. Part number: Replaces #3312303005. Package includes two high-quality RV AC thermistor control sensors. Designed to detect when the indoor temperature is reached to prevent freezing issues. Easy installation to keep your air conditioning system in optimal working condition Replaces Part Number: Replaces #3312303005 Dometic Parts 3312303.005 Kit,SVC Thermistor Wire Harness Function: This thermister sensor is used to detect whether the indoor temperature reaches the set value and solve some freezing problems.