Most heat pumps have features that increase their efficiency during freezing weather. When it starts to freeze over, you might notice that your heating unit stops blowing warm air for some time. The indicator lights blinking means that the heat pump is in the defrost cycle. This is a normal process and there is nothing to worry about.
The heat pump defrost cycle is the process by which the thawing process occurs if the heat pump is operating with a frozen coil. The defrost cycle removes ice buildup from the coil and thaws it, which is necessary to prevent damage to the equipment or injury to the homeowner.
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