Heat Pump Frozen Outside

An iced heat pump gives up capacity every hour it keeps running that way, so call before it stops delivering heat completely.

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When this becomes an emergency

The outdoor unit has a solid crust of ice over the coil.
Indoor air has dropped from warm to barely tepid.
The fan is chattering against ice when it tries to turn.
Ice at the base of the unit is thicker today than it was yesterday.

What a pro does

A dusting of frost that vanishes during defrost is normal, while an ice shell is not. The usual causes are a defrost control that has quit initiating, refrigerant charge that has drifted below spec, or an outdoor fan too slow to keep air moving across the coil. Freeze and thaw cycles that repeat within a single day are especially rough on these systems, because meltwater refreezes at the base of the unit and builds a block the defrost cycle was never designed to clear. A technician times how quickly ice returns after defrost to separate weather from a fault, and chipping at it by hand just bends fins you'll pay for later.

Frequently asked questions

Should a heat pump ice up at all?

A light frost cleared by the defrost cycle is normal, and that is the system doing what it was designed to do.

Why do warm afternoons make icing worse here?

Melt runs down and refreezes overnight at the base of the unit, and that ice accumulates in a place the defrost cycle cannot reach.

Is it better to shut the unit off when it is iced?

Turning it off and letting the coil thaw is a reasonable holding step, since running under heavy ice strains the compressor and returns very little heat.

Does icing mean the whole system is finished?

Usually not. Most of these calls end at a defrost sensor, a control board, or a charge issue rather than at the compressor.

Heat Pump Frozen Outside?

Get connected with a local pro now.

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