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Why does Freezer defrost itself?

My Sears Household Freezer, Model No. 255-2950201) was bought in April 2011 and hasn't been defrosted, But yesterday the bottom three shelves defrosted themselves into the bottom shelf, which overflowed onto our kitchen floor. What's going on here, and how can I prevent it from happening again?

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Refrigerators
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2 Answers from these members:
Fred M
If the unit defrosted itself then likely the control thermostat or compressor is the problem.

The control thermostat regulates the temperature of the unit. If it cycles off but then doesn't come back on then things can defrost. If the unit is not running then try tapping the thermostat or turning it off and the on and see if it starts to run.

Another possibility is the compressor over heated and shut down on overload. It might stay off for a few hours till it cools down and starts to work again.

If the unit is working then you might check and see how hot the compressor is. If you can't keep your fingers on the compressor because it is to hot then the compressor might be the problem.

Compressor amp draw can be checked with a clamp on meter. Anything over 5 amps would be suspect.

If the unit is defrosting itself then listen for a click from the compressor when it tries to run. The click would be the overload tripping due to compressor overheating.

I hope this helps. A freezer is not something you want to have this problem with.

You can reply with any additional details or questions for further assistance.
by Fred M Earned 3,517 community points in Refrigerators
September 18th, 2011
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Joseph Perez
Having a refrigerator that caused a water leak can be a hassle and cause some water damage. While you are waiting for your expert answer, I suggest you add to the thread of this question and include the full and correct model number of your appliance so that the expert can provide you with a more detailed answer. I am adding a link below in where you can enter your appliance model number and the owners manual will pop up in where you can find some good information about the defrost information on your unit. I hope my link is useful.
by Joseph Perez Earned 1,551 community points in Refrigerators
September 15th, 2011
Answered in 8 minutes
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