Question about Refrigerators
Most times the defrost system has something go wrong. Wether electronic or mechanical timer refrigerator have the same other 2 components which is a derost heater to keep frost off the evaporator and a defrost heater thermostat to cease power to the heater when the temp gets warm enough to melt the frost. It is just that simple. After cleaning the coils below and behind an ice box, I look for signs of frost on the back wall of the freezer. If I see it I know their is ice in the evaporation compartment. One thing you can do if you do not wish to take it any further or cannot pay for service is simply unplug the ice box and let it thaw out a few days. By unplugging it and allowing it to thaw out the ice box will magically work fine again for several weeks till the ice clogs the evaporator again. If you wish to fix the ice box remove the service panel and look for the termination thermostat is what I do. If it appears swollen it has failed and therefore the heater will not come on and defrost. Also the heater itself might be bad especially if it is a glass one. Note: The bimetal defrost thermostat will only check good if it is below 50f. It opens above 50f that is its job. It closes at 25f and llows for power to get to the heater. That is how they ALL work. No rocket science needed. On the newer models with computer controlled defrost if the termination thermostat is ok and the heater is ok and the unit has mechanical thermostats to control the cooling I recommend just replacing the defrost control electronic box, if it is a fancier one that has a brain to determine cooling then I recommend replacing thermisters first or at least checking them. You can get a service manual on my googledrive page. Appliancejunkgoogle drive. Google it. LOL
Posted on Jul 17, 2013
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Posted on Jan 02, 2017
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