Heat Pump Frozen Outside

An iced-over heat pump loses capacity every hour it runs that way, so call before it stops contributing heat at all.

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When this becomes an emergency

The outdoor cabinet is encased in solid ice rather than a light coat of frost.
Indoor air has gone lukewarm and the backup heat is carrying the load.
The outdoor fan is striking ice or straining against a blocked wheel.
Ice has stacked up under the unit and no longer clears between defrost cycles.

What a pro does

Frost on the coil during a defrost cycle is expected, and a solid shell of ice isn't. A technician checks whether defrost is being triggered at all, since a failed sensor or defrost board leaves the unit accumulating ice with no way to shed it, then looks at refrigerant charge and airflow across the coil. Mounting height matters where snow piles deep and roof runoff drips onto the cabinet, and a unit set too low gets buried by the same drift twice a winter. During an extended subzero stretch, some ice is normal even on healthy equipment, so what counts is how fast it forms and whether defrost clears it. Chipping at the coil with anything hard bends fins and makes the next cycle worse.

Frequently asked questions

Should the outdoor unit be shut off when it's iced over?

Switching it off and letting the ice release on its own is reasonable while waiting, since running a heavily iced coil is hard on the compressor.

Does heavy icing mean the heat pump is undersized for the climate?

Not by itself. Sizing shows up as a comfort and runtime problem, while a solid ice shell usually points to defrost controls, charge, or airflow.

Why does the same unit ice worse some winters than others?

Snow depth and how the drift builds around the cabinet change year to year, and so does the number of hours spent in the temperature band where frost forms fastest.

Is backup heat running constantly a problem?

It's a signal. Backup heat is meant to supplement during the coldest hours, so a system leaning on it around the clock is telling you the outdoor side isn't contributing.

Heat Pump Frozen Outside?

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