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New 14 seer split ruud heat pump makes very loud knocking noise

When unit goes into defrost the compressor sounds like liquid going back into compressor . Makes very loud knocking noise. Has scroll compressor with 410A freon.Does find except when defrosting.

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Well you may want to have a tech come out and check the freon level, but mostly when going into defrost, some units make alot of noise, the freon is reversed in the unit by way of the reversing valve, it makes a whooshing sound like freon is draining off, as far as the knocking noise, could be as I said in the beginning, might be low on freon, but it could be that, this particular unit does this, I have had units make some really strange noises in the past but functioned perfectly, hope this helped, please let us know, thanks again,
mr.grzz

Posted on Jan 24, 2009

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No-one posted a solution. I contacted the original solution poster who was very helpful.I hope this helps someone else better understand their refrigerator problem and get on the right track. Staffgage.

Tweezb wrote:
"you are right that cleaning under your refrig wont get rid of a "compressor knocking" sound. what it might do is to lower the amount of heat from the condenser coils and thus cause less pressure and stress on the compressor making it run easier and less likely to bang or knock when shutting off.
if your coils were very plugged with lint and you have cleaned them, that will help but it wont "fix" the problem.
inside the compressor is a motor and a pump, the motor is supported by 3 springs and they can stretch or break causing the motor to hit one side of the black outer can and cause the noise.
that may be too technical, but its not something that can be repaired without replacing the compressor, at a cost of 700-800 bucks. most would not pay this as its not worth putting that amount of money into an older refrig."

"think that you are hearing either a freon related sound or even just the sounds of the unit going thru defrost.
how often do you hear the noise? just maybe once a day or is it everytime the unit shuts off?
either way i would rule out the ice maker and water system as when the "shut off arm" is up then it is off and wont make any noise, or ice.
keep the i/m arm up and then listen for the next day or two and try to narrow down when it makes the noise and frequency you hear it and then get back to me.
it may not even be a problem, just normal operating sounds that cant be changed."

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