Heat pump noises?

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Old 11-25-19, 05:56 PM
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Heat pump noises?

I have a 5 ton Heil heat pump that was installed 5 years ago. I bought my house this summer, and at the time I noticed the outdoor unit is kind of noisy when it starts up. Sort of a groaning/vibration sound, but I figured that wasn't too unusual. (Maybe something a bit loose inside the unit?)

Now that I'm in heat mode, I hear the same noise when it starts up, but then occasionally I hear this noise while the heat is still running. There is no reason the compressor should be cycling. It seems like it only does this when it is extra cold outside.

Does anybody have any idea what is going on here? I wish I could describe it better. Is it possible the noise I hear while it is running is the machine defrosting itself? Does it reverse direction temporarily for this?
 
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Old 11-25-19, 08:09 PM
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Yes..... the defrost board tells the reversing valve to reverse the refrigerant flow to defrost.
Some units can be very noisy when they reverse.
Your condenser should defrost more as the temps get colder and the humidity rises.
 
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Old 11-25-19, 08:49 PM
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Great, less to worry about! It's right outside my bedroom so I hear it doing that at night and start thinking $$$$$$....
 
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Old 12-06-19, 10:15 PM
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Compressors make the same vibrating noise when they have to work harder or when they are getting low electricity.
 
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