Question about LG Refrigerators

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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 more times than not. There is no water hooked up and the ice maker is turned off.

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  • steve
    steve May 11, 2010

    Check the compressor fan motor for something stuck in it or the fan blade tipping on something.

    And let me know.

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  • Master
  • 1,314 Answers

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

Posted on Mar 11, 2009

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1 Answer

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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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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.
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Does the sound occur when the compressor is starting or shutting down? and only lasts for a couple of seconds? I had one do the exact same thing. Sometimes it would also wake me up at night. If so, I'm afraid he is right. On the bright side, it worked fine for years. I gave it to a girlfriend when I purchased a bigger one and it is still working today. The only thing you can do is change the compressor, which is probably not $$ practical.

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