Question about Kenmore Refrigerators
I am cleaning condenser coils, freezer has frost on inside back wall and am going to check thermostat and defrost switch. How can I tell by looking at them
(one of the answers on here said it would be obvious with the thermostat) and tell that they are bad? Does the switch require a tester? or is it one of the things you change because the other parts checked OK? I have background in troubleshooting handheld calculators to component level.
Talk technically as you want and I'll ask questions about the part that's over my head. ;o)
Looking at the defrost thermostat is a waste. It's true the disk will sometimes show a bulge, but not always. It's test is to be in an environment where the temperature is 0 to 30 degrees and have been there for at least a half hour. Then a continuity test with a VOM meter should show zero ohms. No resistance.
If by defrost switch, you mean timer, the basic test is to advance it until the machine shuts off. With the machine left turned on, the machine (if the timer is good) will turn itself back on in no more than 35 minutes. If not, it's bad and needs replaced.
In the real world of appliance repair, it's done the other way around.
First test the main heater with the ohm meter. It should read 35 ohms or less. If it looks good, and tests good, then replace the defrost tstat and timer and call it duty.
Here's an excellent tutorial on defrost systems.
Posted on Apr 22, 2010
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Posted on Jan 02, 2017
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