To determine if the defrost sensor or fuse is defective, use a multimeter to test both the sensor and fuse for continuity. If the timer does not send power to the defrost components or advance out of the defrost cycle within 30 minutes, … To determine if the defrost timer is defective, slowly advance the dial into the defrost cycle. This tests your device's proximity sensor, which is responsible for turning your screen off whenever your phone is against your face in a phone call to prevent accidental touches. Once you have diagnosed the problem we have the OEM replacement defrost thermostat that fits your appliance. If either the defrost sensor or fuse does not have continuity, replace the defrost sensor. It indicates a fault of the defrost sensor.
The screen should now turn green if the proximity sensor works, so uncover the screen to turn the screen white and proceed to the next test. This element acts as a switch between the timer and the heater. The easiest way to do this is to unplug the unit from the wall.


To test for this feature, simply cover the top of your phone with your hand. Then the contacts open, the heater stops and the timer starts the defrost countdown. When the temperature drops to a certain point, its contacts close, and the heater transmits voltage through them. Use our step-by-step refrigerator repair guide to learn how to test your defrost thermostat. Alternatively, you could trip the appropriate …

Before you begin to test your defrost thermostat, make sure you disconnect the appliance's power supply. The compressor should turn off and the heater should turn on. If the defrost timer is defective, it may not advance into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle.