Heat Pump Frozen Outside

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

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When this becomes an emergency

The outdoor cabinet is locked in a solid rind of ice rather than wearing light frost.
Indoor air has gone from warm to barely tepid.
The outdoor fan is slapping or scraping against ice as it turns.
Ice has grown up from the pad and never clears between cycles.

What a pro does

Frost on a heat pump is expected; a solid shell isn't. What separates the two is whether defrost cycles are actually clearing the coil, so a tech watches for a defrost to initiate and checks the board, the coil sensor, refrigerant charge, and the fan motor's real speed. Placement matters enormously in this climate. A unit sitting where roof runoff drips onto it or where a plow bank ends up buried against the cabinet ices faster than defrost can ever keep up with, and raising or relocating it fixes what no part swap will. Prying ice off with a tool bends fins and makes next winter worse.

Frequently asked questions

Should snow be cleared away from the outdoor unit?

Keeping a clear space around and above the cabinet by hand helps a lot, since a buried unit can't move air across the coil and can't shed what it melts.

Is icing normal at all?

A light coat during and just after a defrost cycle is normal operation, and the system is designed to shed it on its own.

Does heavy ice mean the heat pump needs replacing?

Usually not. Most cases come back to a defrost control, a sensor reading wrong, a slow fan, or a charge that's off, all of which are repairs.

Is it better to shut the system off while waiting?

Switching to a backup heat source and letting the ice melt on its own is reasonable, because running a coil packed with ice is hard on the compressor.

Heat Pump Frozen Outside?

Get connected with a local pro now.

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