Wie te bellen · hvac-technician
Heat pump not defrosting? Dit is wie je moet bellen
Heat pumps naturally build frost on the outdoor coil in cold weather, and they run automatic defrost cycles every 30–90 minutes to melt it off. When defrost fails, ice encases the entire outdoor unit, blocking airflow and destroying efficiency — you'll notice lukewarm air from the vents and the compressor running constantly. Common causes are a faulty defrost control board or timer, a stuck reversing valve (which flips the system to cooling mode temporarily to defrost), a bad defrost thermostat or sensor, or a refrigerant leak that alters coil temperature. An HVAC technician can diagnose the failed component, replace the board, sensor, or valve, and verify proper defrost cycling before ice damages the compressor.
What's going on
How to fix heat pump not defrosting
Some "heat pump not defrosting" cases look simple, but getting it wrong almost always costs more than calling a pro: hidden leaks, fire risk, code violations, and insurance headaches. A licensed hvac-technician will diagnose the exact cause, use the right professional tools, and stand behind the repair. Most local pros offer free quotes and can visit the same day or the next.
Who to call
hvac-technician
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Symptoms to look for
- 01
Thick layer of ice on the entire outdoor heat pump unit
- 02
Lukewarm or cool air blowing from vents when set to heat
- 03
Outdoor unit fan runs constantly but never switches to defrost mode
- 04
Higher than usual electricity bills during heating season
- 05
Compressor makes laboring or unusual sounds under heavy ice load
FAQ
Frequently asked questions
Who should I call for: Heat pump not defrosting?
Call a licensed hvac-technician. hvac-technicians have the specialized training, tools, and insurance to diagnose heat pump not defrosting safely and stand behind the fix. Most offer free quotes and can visit the same day or the next.
Can I fix this myself?
Some minor cases can be handled DIY, but most require a licensed hvac-technician to avoid costly rework and safety risks. A free quote takes under a minute.
How fast can a pro come out?
Most hvac-technicians offer same-day or next-day visits for non-emergency issues. True emergencies (burst pipes, gas smell, no heat in winter) are typically handled within 1–4 hours.
How much does it cost to fix?
Costs vary by severity and your location. Submit a free quote request to get real pricing from local pros in your area.
What are the signs of: Heat pump not defrosting?
Thick layer of ice on the entire outdoor heat pump unit. Lukewarm or cool air blowing from vents when set to heat. Outdoor unit fan runs constantly but never switches to defrost mode. Higher than usual electricity bills during heating season. Compressor makes laboring or unusual sounds under heavy ice load.