Why would a heat pump freeze up in the winter?
Heat pumps often ice up during cold weather because when the unit generates heat, the refrigerant (inside the heat pump) turns to gas and then the moisture in the air condenses when it passes across the evaporator. In winter temperatures this condensation will freeze which is perfectly normal.
Grant air source heat pumps have a built-in defrost function to enable the system to continue working during cold weather. You can read more about this defrost function in our Knowledge Hub.
The information provided here is advice only - if you are not happy to check your product, please contact a heating engineer to assist.
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