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Why does my air handeling coil freeze up when the heat pump is in heat mode?

April 26, 2017air coil freeze handeling heat mode pump

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Why does my air handeling coil freeze up when the heat pump is in heat mode?

1 Answer

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I have a TRANE XL 1200 heat pump. When in the heat mode the air handeling coil freezes up, enough to block the air flow. I can turn the heat pump off and leave the air handeling unit air circulating fan on and get the ice melted. After 30 minutes or so I can turn the heat pump back to the on poslition and the unit works normally for several hours. It then freeses up again. What is the most likely cause of the problem?