Services · Repair
Heat Pump Repair in St. George, UT
A heat pump shares most of its parts with a standard AC system — see the general AC repair guide for capacitors, contactors, and refrigerant issues that apply to both. This page covers the two failure patterns that are genuinely unique to a heat pump: a reversing valve stuck in the wrong mode, and defrost-cycle problems that show up as ice on the outdoor unit. If you're deciding whether a heat pump is the right equipment in the first place, see heat pump installation in St. George instead.
As of August 2026, heat pump repair in St. George typically runs $150–$700 — a thermostat or capacitor at the low end, a reversing valve or defrost control board in the middle, and a compressor replacement ($600–$2,500) at the high end.
The two failure patterns unique to a heat pump
A heat pump's whole design trick is the reversing valve — the one part that lets the same outdoor unit cool the house in summer and heat it in winter by running the refrigeration cycle in either direction. That valve, plus the defrost cycle that keeps the outdoor coil clear of ice during winter heating, are the two things a straight AC-plus-furnace system simply doesn't have — and they're where heat-pump-specific repairs come from.
- Stuck reversing valve. The system keeps running one mode (usually cooling) no matter what the thermostat calls for — cold air on a heat call is the classic symptom.
- Defrost cycle failure. Some frost on the outdoor coil in winter is normal and clears on its own; heavy ice that doesn't clear points to a bad defrost control board, a failed outdoor sensor, or the reversing valve again.
St. George's winters are mild relative to northern Utah, so deep, prolonged icing is less common here than in a colder market — but Washington County still sees enough overnight lows near or below freezing each winter that defrost-cycle problems do show up on local systems.
Common heat pump repair issues
- Reversing valve stuck or failing — cold air on a heat call, or the system won't switch modes at all.
- Defrost control board or outdoor sensor failure — heavy ice buildup on the outdoor unit that doesn't self-clear.
- Capacitor or contactor failure — same shared-component issues as a standard AC; see the AC repair guide.
- Refrigerant leak — reduced heating and cooling performance together, since both modes use the same refrigerant charge.
- Outdoor fan motor failure — the unit runs but doesn't move enough air across the outdoor coil in either mode.
- Compressor failure — the most expensive single-part failure, and the one most likely to tip the repair-vs-replace math toward replacement on an older system.
Heat pump repair cost in St. George (2026)
| Repair | Typical cost |
|---|---|
| Diagnostic / service-call fee | $75–$200 |
| Thermostat replacement | $140–$350 |
| Capacitor replacement | $100–$350 |
| Contactor replacement | $200–$450 |
| Defrost control board | $200–$650 |
| Reversing valve replacement | $300–$700 |
| Outdoor fan motor | $200–$700 |
| Refrigerant leak detection + repair | $200–$1,600 |
| Circuit board replacement | $120–$700 |
| Compressor replacement | $600–$2,500 |
Shared-component rows (thermostat through circuit board) match the AC repair cost table exactly — a heat pump uses the same parts for those. Defrost control board and reversing valve figures are compiled from 2026 national heat-pump-repair cost data, adjusted for the local market the same way every dollar figure on this site is.
Repair or replace?
The rule of thumb most contractors use: if the system is past 10–12 years old and the repair quote runs close to half the cost of replacement — a compressor or evaporator coil failure often lands right there — replacement usually wins on lifetime cost. A cheaper, more common failure on a system otherwise in good shape is almost always worth repairing instead.
If you're weighing replacement, the HVAC replacement cost guide has the full installed-cost breakdown by system type, and heat pump installation in St. George covers what to ask an installer if a heat pump is the direction you're considering.
Methodology & sources. Shared-component repair costs match this site's canonical AC repair cost table. Defrost control board and reversing valve figures are compiled from 2026 national heat-pump-repair cost data, adjusted for the local market. All figures last verified August 2026. Actual costs will vary by provider, equipment brand, and site conditions — use these ranges to evaluate a quote, not as a binding estimate.
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FAQ
Common questions
How much does heat pump repair cost in St. George?
As of August 2026, heat pump repair in St. George typically runs $150–$700, depending on what failed. A thermostat or capacitor sits at the low end ($100–$350); a reversing valve or defrost control board runs $200–$700; a compressor replacement runs $600–$2,500 at the high end. See the full breakdown below.
Why is my heat pump blowing cold air when it's set to heat?
The most common heat-pump-specific cause is a stuck reversing valve — the component that switches the system between cooling and heating mode. If the valve fails in the cooling position, the system keeps running its summer cycle no matter what the thermostat is set to, so you get cold air on a heat call. It's a repair unique to heat pumps; a straight AC-plus-furnace setup doesn't have this failure mode at all.
Why is there ice building up on my outdoor unit?
Some frost on the outdoor coil during winter operation is normal — heat pumps run a brief automatic defrost cycle every so often to clear it. A problem is when ice builds up heavily and doesn't clear on its own: that usually points to a failing defrost control board, a bad outdoor temperature sensor, or (again) a reversing valve stuck in the wrong position. Left alone, heavy icing restricts airflow and can damage the compressor, so it's worth a service call rather than waiting it out.
How do I know if I should repair my heat pump or replace it?
The rule of thumb most contractors use: if the system is past 10–12 years old and the repair quote is close to half the cost of replacement — a compressor or evaporator coil failure often lands right there — replacement usually wins on lifetime cost. A cheaper, more common failure (capacitor, contactor, thermostat, even a reversing valve) on a system otherwise in good shape is almost always worth repairing. See the full replacement cost breakdown on the hvac replacement cost guide.
Do you perform the repairs yourselves?
St. George Air Repair connects you with a licensed local provider who performs the diagnosis and repair — we research local costs and common failure points, but don't perform the work ourselves. Verify the contractor's Utah DOPL license before hiring.