I have a brand new Carrier a/c 24ACA. It seems to work well, quiet when it turns on and while its running. I'm concerned because often (not every time but most of the time) the unit makes a pretty loud clunking noise as it shuts down. Its pretty annoying as the unit isn't too far from a window in the kitchen. The a/c technician said it was typical of a "scroll compressor"
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My CKC was doing the same thing and I thought it was the compressor slamming to a stop. Turns out it was the fan motor. I had a local company replace the motor and the sound is gone. That being said, it has now been replaced by blade vibration.. It just never ends!
The clunking noise you hear , is probably when the compressor shuts off , due to temp reached or when it goes into defrost . An internal motor mount spring , inside the compressor , is broken ( rusted and broke ) . The refrig can go on working for years , without any problem , except noisey , when it cuts off . To stop the noise , replaceing the compressor is the only option . I have heard of placeing objects under 1 leg of the compressor , to " re-adjust " the ballance , but thru my experience , another spring broke , causing more knocking .
it sounds like the compressor insides are loose and you will be needing a new compressor, but just check and make sure the rubber mounting feet on the outer compressor base where its mounted to the refrigerator base are all tight and the rubber shocks are all good
The contactors on each unit were stuck closed. I shut off power to the units for about 2 hours. I went back out and checked and the contactors had released. I re-powered and they started up. Great solution, but didn't really do anything.