My 1994 built home has the original heat pump. When placing the unit in regular heat mode, it makes a loud thumping very close to the Jumanji movie drum beat. I'm not kidding and is very loud and can be heard from any home within 200 feet. The only way I can get it to stop is turn the unit off or place it in Emergency heat mode.
I had a technician take a look at it last year and he he thought the refrigerant was low and added some. This didn't help the issue and unfortunately the unit wouldn't make the noise while the service technician was here.
The unit works fine for AC during the summer without the noise and only makes it in regular heat mode after being turned on for about 15 minutes.
Any thoughts?
Bill H
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