Question about Refrigerators
I would first look under the ice box for signs of air restrictions. Clean out the bottom and make sure the fan and compressor is working. Inside the ice box listen to see if the fan is running in there. If that is fine I would look for signs of frost on the back wall of the freezer. If frost is present then ice is on the coils and you have a defrost problem. Their are 2 basic circuits in an ice box. Compressor run AND Defrost run. Compressor run circuit is anywhere from 8 to 12 hours depending on manufacturer. Defrost is 21 minutes. On new fangled electronic ice boxs the brain decides when defrost is needed using inputs from sensors, compressor run time, and how many times the ice box is opened and closed. But the new fangled ice boxs still have a defrost heater and thermostat like any ice box with automatic defrost has. Why do we need a thermostat? The heater is very powerful. It could easily destroy the ice box. It takes only moments to elevate the crawlspace inside the evaporation compartment to 50 degrees F. This keeps any frost that could turn into air flow blocking ice at bay.
Remember the defrost time is 21 minutes. If that heater was left on for 21 minutes it would not be purty. The termination thermostat is recommended to be replaced if it goes bad or whenever the heater is replaced. I say replace all 3 things in the circuit and be done with it. But who these days can afford that? If you suspect a defrost problem just unplug the ice box for a day or 2. If the ice box goes back to performing ok then you can suspect you indeed have a defrost problem.
Posted on May 21, 2011
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Posted on Jan 02, 2017
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