Tip & How-To about Refrigerators
Whether your refrigerator works with a fancy computer program to determine defrost or has a plain Jane tried and true timer for defrost, the defrost heater and termination thermostat is the same in both. Any self defrosting ice box has 3 components, A timer or electronic device to commence defrost operation, a heater to warm the coils and melt the frost, and a defrost heater termination thermostat to shut down the the heater after the temp has warmed enough to do the job. The typical defrost cycle lasts from 21 mins on a conventional timer to 40 mins on electronic monitored ice box's. Checking the heater is easy enough, if it has continuity it is ok. checking a defrost thermostat is a little more tricky. It will be open if it is above 50f where you are testing. The design is 25f it closes and allows power to the heater and at 50f it opens and shuts down power to the element. because the element cannot remain on for the entire cycle. Here is a video i recently put together to show what to check in a defrost circuit, While all ice box's are diff in size and specs they all work the same.
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