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Refrigerator brief loud knock when compressor shuts off

I have finally traced a strange noise to my 11 year old Kitchenaid KTRS21KDAL02 refrigerator. The noise is very brief -not over a second. It is a fairly loud knock like sound with a bit of rattle following, and it happens just as the compressor turns off. It has been going on some time, but I just traced it to the refrigerator. I pulled the metal cover for the back bottom section where the compressor is located. The compressor seems to be well attached with 4 bolts going through rubber mounts to the bottom panel of the refrigerator. I could not find anything that seemed to be knocking together when pressed by hand. This does not happen every time the compressor turns off, and when it does not happen you just hear the normal relay click. There is a fiberglass pad or something of the sort stuffed between the top of the compressor and the top of the metal compartment in which the compressor and other components are in. If this is something serious and the refrigerator is about to fail, I would just replace it. However if it is not likely to be serious I can live with the noise.

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  • jralbert Apr 15, 2009

    Same problem as original post describes

  • Anonymous Mar 28, 2014

    WHAT COULD BE THE PROBLEM

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The compressor you see is actually the outer shell, inside of which is a refrigerant pump (ie:compressor) which is on internal support springs. When the unit turns off, the momentum of the internal parts can sometimes knock against the outside of the compressor case. The only "fix" would be a new compressor. In the real world, the fix is to live with it. It's generally not an indication of immenent compressor failure and most likely will run many more years with no problem. Note: if you put your hand on most compressors (even new unused ones) and give them a shake, you will hear that noise.

Posted on Aug 29, 2008

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  • Master
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The very first thing to check is the mounting assembly. Most are mounted on dampeners, or springs, they are so the motor can take the shock of starting and turning off. If you check the mounting assembly and do not notice any excessive movement in the motor between it and the mount, then what Carl said would be the problem.

Posted on Apr 02, 2012

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