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View Full Version : Condensing unit - clunking noise when shuts off


adamt56
10-01-2009, 08:45 AM
Hi, I just noticed that my outdoor unit is making a louder than what I believe is normal clunking noise when it shuts off.

Is this cause for concern? The (Carrier) unit it slightly over 1 year old and otherwise, works fine . . .

Thanks!
jdrob12000
10-01-2009, 10:10 AM
I would call a pro on this one, there may be problems with the compressor that if caught in time could save it
adamt56
10-02-2009, 06:45 PM
The tech came out and said everything was fine. Explained that is was the pressure equalizing instantly (something like that).
catmanacman
10-02-2009, 07:50 PM
did he make sure the fan blade set screw was tight
DanW13
10-02-2009, 09:32 PM
sure it wasn't the duct work you were hearing making the noise from expanding and contracting form the heat and cool air? When the heat kicks in the duct works expands, and shortly after the heat turns off the duct work will contract.
adamt56
10-02-2009, 10:25 PM
did he make sure the fan blade set screw was tight

No
adamt56
10-02-2009, 10:26 PM
sure it wasn't the duct work you were hearing making the noise from expanding and contracting form the heat and cool air? When the heat kicks in the duct works expands, and shortly after the heat turns off the duct work will contract.

Yes, I am sure. It was/is clearly a noise coming from the outside unit.
DanW13
10-04-2009, 01:53 AM
Has to be the line sets coming into the house then, check the lines when the OD unit is running and also check the line inside
Kevin O'Neill
10-04-2009, 08:09 AM
Is this a heat pump?
adamt56
10-04-2009, 09:54 AM
Is this a heat pump?

No.
adamt56
10-04-2009, 09:57 AM
Has to be the line sets coming into the house then, check the lines when the OD unit is running and also check the line inside

The lines going into the house or out . . . What is the difference? The sounds is heard when standing outside next to the unit and comes from within.

It is not a continuous noise - The compressor is just making a "louder than I remember" noise as soon as it shuts down.
mike robinson
10-04-2009, 11:01 AM
What kind of compressor does it have? If it has a scroll it could be turning backwards untill pressure equalises.
adamt56
10-04-2009, 11:17 AM
What kind of compressor does it have? If it has a scroll it could be turning backwards untill pressure equalises.

I've not a clue. Whatever comes stock new in Carrier Performance series units.