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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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I have had my wine fridge for 16 months & it was running all the time and it started making a loud clanking noise from the fan area. I haven't had it that long. What is causing this problem?

I would start by checking to see if anything is touching the fan blades. Believe it or not, mice typically get decapitated by them. Also wires can get in the way. However, About says: "Clicking, banging and knocking: These sounds can come from the compressor telling you there is a problem with it. Normally, it can make a whining or pulsating noise"

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How do I stop the loud knocking noises coming from my refridgerator?

Pull the fridge away from the wall and inspect the compressor. Your description sounds like the compressor is hitting something. It is rubber mounted and usually can be pushed away from whatever it is hitting.You do not want to jamb something to stop the noise, as the compressor needs to move freely. Many compressors shake during start up and shutdown, and this is considered normal. Abnormal if the compressor hits something during this movement.

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Here is a tip that I wrote about dryers and noises...

It will help you determine what is happening there...

Dryer Repair Squeaks, Grinding, Clicking and Knocking Noise


Asker's Testimonial "That answer was very informative - thank you for taking the time to educate me. " - teresa241964

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I have a brand new 2008 crf 150f and have only rode it 3 times and i noticed a knocking sound coming from the motor when i give it throttle

First try to locate the area where the knocking is comming from,one method is to use a lenght of wood like a short section of broom handel .start the engine and put your ear to one end of the wood and move the wood around the engine untill the knocking is at its loudest . This will tell you the area where to problem is .Then seek advice from someone who knows about engines ,Being a new bike there should be no knocking ,so there is a big problem either with the bearings or somethings hitting something .

Mar 12, 2010 | 2005 Honda CRF 150 F

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Whirlpool fridge incessant buzzing

The knocking noise when cuts off , is a compressor internal motor support spring , broken . This does not mean the compressor is bad , only noisy for the rest of the compressor life , but should be covered under the 5 yr warranty . The gurgling sound is the refrigerant being pumped thru the system . The buzzing could be from the compressor also . My suggestion , would be to call a factory warranty company , to see if they can replace the compressor under warranty .

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Knocking noise

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Knocking noise occurs about 20 seconds after compressor starts. Sounds like someone knocking on a wood door. It last about 8-12 knocks and then stops. It does not occur everytime the compressor starts but...

its Freon expansion at the part where the lines come in to the evaporator in the freezer its a nuisance but supposed to be normal go to your local appliance parts and ask for some sound damping pads and wrap them around the lines where they come into the evaporator lots of times this stops it

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Knocking noise coming from Whirlpool Gold refrigerator

I also have a new Whirlpool Gold fridge (bottom freezer with French doors) and it was making a knocking sound. The knocking sound would start when the fridge kicks in and starts running to cool, and would last for about a minute or less and be a slow knock.
I called Whirpool customer service since it is new and on warranty. They sent out a technician and he said the knocking is from gas/air built up in the copper tubing for the freezer because the copper tubing is too cold, and when the fridge first turns on it forces the air through, making the knocking sound.
His "fix" was to adjust the copper tubing so that it is closer to the heat of the motor/compressor and heat of another copper line so that the cooler line stays warm so the air/gas doesn't build up. His fix worked slightly, but the fridge is still knocking, just not as bad and not as long - it knocks fast for about 5 to 10 seconds instead of a minute.
Going to call customer service again soon and see where to go from here.

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The compressor could be a little lose from shipment from factory, to warehouse, to your home. If the bushings are lose, when the compressor kicks on, it can cause a jarring or vibration in the system lines. Disconnect the power from the wall before you attempt to touch the compressor and see if there is any play in the mounting bushings for the compressor.

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Knocking/banging sound on compressor start up

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