Heat Pump Frozen Outside

A heat pump under a shell of ice loses capacity every hour it runs like that, so call before it quits making heat at all.

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When this becomes an emergency

The outdoor unit is encased in ice rather than dusted with frost.
Supply air indoors has turned tepid and stays that way.
There is a scraping sound as the outdoor fan contacts ice.
Ice keeps thickening cycle after cycle instead of clearing.

What a pro does

Light frost that disappears during a defrost cycle is ordinary. A solid casing of ice usually means the defrost control has stopped initiating, the charge has drifted low, or the outdoor fan has slowed enough to stop moving air across the coil. Placement plays a part too, because a unit set on the windward side of the house catches blowing snow that packs the coil face solid faster than defrost can clear it. A technician measures how quickly ice returns after a defrost, since that timing is what distinguishes hard weather from a real fault. Breaking ice off by hand bends fins and it's easy to do more harm than good.

Frequently asked questions

Is any icing normal?

Yes. A thin layer that melts off during the defrost cycle is the system working as designed.

Does the wind here make icing worse?

It does. Blowing snow drives into the coil on an exposed unit, and a blocked coil ices over long before a sheltered one would.

Should the system be switched off when it is iced?

Turning it off and letting the coil thaw is reasonable, since running heavily iced strains the compressor and produces very little heat.

Does this mean the heat pump needs replacing?

Rarely. Most icing traces back to a defrost sensor, a control board, or refrigerant charge, none of which require a new system.

Heat Pump Frozen Outside?

Get connected with a local pro now.

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