Defrost Temperature Sensor Test

If you find that you have a bad defrost heater and you need to purchase a new one.

Defrost temperature sensor test.

A defrost sensor is generally a thermistor. A thermistor changes resistance based on the temperature it is exposed to. Once the temperature reaches a preset level the defrost thermostat. Learn how to test the thermistor to see if it s working.

This video shows the proper way to test your defrost thermostat. In order to test you can measure the ambient temperature make the sensor is removed and acclimated measure the ohms of resistance and compare to the manufacturer chart. Also see how to check the wires that connect the thermistor to the electronic control board to make sure the problem isn t with the wiring or the. You can purchase one from amazon by clicking this link.

If your defrost heater has a defrost thermostat wired in series like mine you ll need to make sure the thermostat has cooled down below its closing temperature before doing the ohm test. The defrost thermostat a bi metallic switch controls the temperature rise in the freezer compartment during the defrost cycle. This video from sears partsdirect shows how to troubleshoot problems with your refrigerator s thermistor or temperature sensor if your refrigerator is not cooling at the right temperature.