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Heat Pump Cycles On and Off and Air Handler Noisy

\015 Bryant heat pump cycles on and off continuously when set on heat-cycles on for 5 seconds & cycles off for 15 seconds. Outside temp 59 degrees, humidity 95%. Also happens in extreme cold weather. System keeps house at set temperature. If switch to air for 2 mins. & switch back to heat, stops cycling and works fine for a few days. Carrier air handler is now making a loud harmonic vibrating sound.\015

Answers :

I am pretty sure you have a low charge and the pressure switch is kicking it off. probably just a pound or two however the accumulater will sometimes hold more.

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