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During the winter the fan occasionally shuts off on my heat pump outside unit, then restarts with a big puff of smoke. What is wrong with it?

April 26, 2017big fan heat outside pump restarts shuts winter

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Posted

During the winter the fan occasionally shuts off on my heat pump outside unit, then restarts with a big puff of smoke. What is wrong with it?

1 Answer

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Posted

Nothing is wrong with your unit. What appears to be smoke is steam from the outdoor coil after it completes a defrost cycle. After extended run times the outdoor unit will start to build frost or ice on the coil. The system is designed to go in a defrost mode when needed to clear the ice away and keep the efficiency level up.