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Knocking/banging sound on compressor start up

When the compressor starts up the fridge will make a knocking sound like someone knocking on wood or the front door. the knocking is of differing intervals and happens only on compressor start up, and not shut down. i have had technicians out several times to evaluate the problem, and it is always the issue of it not doing it while the tech is there. during the one time the tech was there and it made the noise, he dismissed it as "normal function." i have owned a fridge or two in my life and do not accept this as normal function. the knocking is so loud it will wake us up at night. some observations: 1. it seems to happen more at night than daytime. perhaps this is just due to fact that there is less ambient noise at night - but it really seems worse at night. However, i have been noticing it at all times of the day now. 2. i feel it has something to do with the freon at start up of the compressor - but this is just my supposition. 3. the fridge was laid down flat when it was being carried into the house. i remember way back when someone telling me never to lay something down flat. could that be part of cause for this issue? i am giving up on factory help, please assist me in being able to fix myself. Thanks, Todd. Our almost new Performa Whirlpool refrig makes a knocking sound a number of times a day. It is no esthetic problem, but I want to be sure it is not interfering with the operation and lifetime of the refrig.

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  • Ken Bledsoe May 11, 2010

    After moving the unit how long before you started it up?



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Check the compressor mounts. They are usually springs mounted with rubber. If they are two loose the compessor wil hit some other metal part when starting up. Shakle it and see what it is hitting. Ajust accordingly. 

Posted on Dec 27, 2008

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Remove the cover located at the rear/bottom of fridge. Check that the bolts holding the compressor are tight. Sometimes just tightening these bolts will solve a compressor knock problem. If that does not sure the problem try replacing the rubber cushions under the compressor bolts.

Posted on Jan 21, 2009

  • mmttnnman Jan 03, 2012

    I had the same problem. I removed the back panel to the compressor, sure enough it was worn rubber mounts. I shimmed all four mounts with a plastic zip strip. Good as new in less than an hour ;)



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Knocking/banging sound on compressor start up

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