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The model tag should be in the refrigerator section, usually on the ceiling or high on a side wall.
Thank you! Is the knock at the compressor when the unit comes on or goes off?
Okay, so that is likely the compressor. Is it pretty loud, kind of a loud knock and maybe a couple shudders after?
If it is running, just shut it off and see if the noise occurs.
That is probably the compressor piston. It is mounted on three springs inside the compressor shell and if one spring breaks, the piston will hit the side of the compressor. Can you shut it off and see if that seems to be the case, please?
Was the compressor running? Did it knock when you unplugged it?
The compressor was probably not running. Can you plug it in and open the doors until the compressor comes on, please?
Once the compressor starts, allow about a minute and then unplug it and see if you hear it make that noise.
Without being plugged in?? Where is the noise coming from, can you tell? Low in the back?
Okay, as odd as it sounds, can you shake the cabinet a bit and see if it sounds like it is banging in the compressor area?
If you can, there is a cover at the bottom. I just want to make sure I give you the most accurate information.
Is the compressor running now?
Is the compressor vibrating if you set your hand on it?
No, the large black ball looking thing.
Yes, that part.
Okay, leave the fridge door open until it starts vibrating, please.
Of course, it will need to be plugged in.
Let it run for about a minute then unplug and see if it knocks.
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The compressor is broken internally. It will continue to cool fine like that and may last for a long time, but it will be noisy like that. The compressor will need to be replaced, that is a major job. It is something you need to have professionally done, requiring specialized tools and training. It will cost about $400 + parts to have it fixed. I would use it ias it is or replace it, considering the age.
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But at the compressor when you shook it?
See the picture at the link below.
Does it seem to be louder inside the cabinet than outside?
Hmm, maybe a fan rattling in the freezer?
I am not sure how jiggling the compressor would make it sound, though. Can you jiggle it some more and follow the noise?
How are the temperatures?
Hmm, that could cause the fan blade to hit on frost and make noise but that would not usually be too loud. What I would do is allow a complete thaw. The IF error means there is an issue with the fan, so it is probably related to it hitting on frost. I would thaw it totally out and see if the noise goes away.
You bet, keep me posted!