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Old 06-06-2016, 12:44 PM   #1
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Dometic air conditioner compressor making rattling noise

My 2 year old 41 ft Big Horn front air conditioner compressor makes what I call a rattling or knocking noise. Cools really good, but the noise can't be ok. Been doing it a couple months. When the compressor cycles off, the noise stops. Help, please
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Old 06-06-2016, 12:52 PM   #2
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The compressor is in a sealed unit, so I doubt if it's rattling. Most likely a piece of sheet metal is loose and making the noise. Take off the cover and observe and listen while it's running. I think you'll find the loose sheet metal or where the vibration is causing the noise.
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Old 06-09-2016, 12:49 AM   #3
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Quote:
Originally Posted by BFlinn181 View Post
The compressor is in a sealed unit, so I doubt if it's rattling. Most likely a piece of sheet metal is loose and making the noise. Take off the cover and observe and listen while it's running. I think you'll find the loose sheet metal or where the vibration is causing the noise.
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Notice: Do not exceed you comfort level or skills. There are moving parts, and electrical dangers if energized.

I agree the circuit is sealed and generally those scroll compressors a pretty durable. I'd suspect "something" vibrating at the compressors frequency. Could be a panel cover, or even loose screw. If you're feeling adventurous pop the cover and check around. thump a few things with your thumb etc. Tighten or add a piece of tape if need be. Those units get jarred around bopping down the highway, grip the compressor like a football and jiggle it making sure it's seated on the pins correctly. The rubber isolators (on the feet) should be centered and not on a bind with the post retaining clips. Look on the inside of the cover or other surfaces for evidence of chafing or rubbing.

Happy trails.
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Old 06-09-2016, 09:04 AM   #4
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This is a case where poking it with a stick is a perfectly fine action. The stick is a non-conductor of electricity. Just don't poke it into a fan. Putting light pressure on the sheet metal often will reveal the noisy part.
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Old 06-09-2016, 11:46 AM   #5
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Sometimes you'll find a dirt dobber nest on the fan blade putting it out of balance. very common
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