Heat Pump Frozen Outside

An iced-over outdoor unit loses capacity every hour it runs that way and can damage its own fan, so call before it quits producing heat entirely.

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When this becomes an emergency

The outdoor unit is buried in solid ice rather than a light coat of frost.
Drifted snow has packed against the cabinet and blocked the coil.
The fan is clattering or straining against something as it tries to turn.
Indoor air has gone lukewarm and the backup heat is running almost constantly.

What a pro does

Frost during a defrost cycle is expected and isn't a fault. A solid shell is not, and the tech is looking at whether the defrost board is calling at all, whether the outdoor sensor still reads correctly, whether refrigerant charge has drifted low, and whether snow load or drifting has simply choked off the airflow the coil needs to shed ice. Placement matters more in open country than most people expect, since a unit sitting downwind of a long fetch will pack full of blowing snow in a single storm. Clearing drift back from the cabinet is fine; chipping at the coil bends fins and makes the next freeze worse.

Frequently asked questions

Do heat pumps even make sense in a climate this cold?

Cold-climate models hold useful capacity well below zero, but nearly all of them are paired with a backup heat source for the deepest stretches of the season.

Should snow be shoveled away from the outdoor unit?

Yes, keeping a clear space around and above the cabinet is one of the few things that genuinely helps, and it should be done gently by hand rather than with a blade.

Why does the backup heat run so much once the unit ices up?

A blocked coil can't absorb outdoor heat, so the system falls back on electric or fuel-fired backup to keep up, which is why the first sign is often the power bill.

Is steam coming off the outdoor unit a bad sign?

No, that's a normal defrost cycle doing its job. It looks alarming from a distance and usually lasts only a few minutes.

Heat Pump Frozen Outside?

Get connected with a local pro now.

Tap to Call(866) 661-2784

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