Heat Pump Not Heating? 8 Things to Check First

A heat pump that won't heat is frustrating, especially on a cold, wet valley night. Before you call for service, run through these checks.

1. Check the thermostat

Make sure it's set to HEAT, not COOL or AUTO, and that the set temperature is above room temperature. Replace thermostat batteries if it has them.

2. Check the breakers

The outdoor unit and indoor air handler usually have separate breakers. Reset any that tripped once. If it trips again, stop and call a pro.

3. Change the filter

A clogged filter chokes airflow and can make the system shut down or blow weak air.

4. Look at the outdoor unit

Is it running? Is it buried in leaves or blocked by snow or ice? Clear debris by hand with the power off.

5. Is it defrosting?

In cold, damp weather the unit runs defrost cycles, which can briefly blow cooler air and release steam outside. That's normal and should last a few minutes.

6. Air feels lukewarm

Heat pumps deliver steadier, gentler warmth than a gas furnace. If the house still reaches temperature, it's likely working fine.

7. Ice that won't clear

A thick block of ice that sits for hours points to a defrost, refrigerant or airflow problem. Switch to emergency heat and call for service.

8. Short cycling or strange noises

Frequent on and off cycles, grinding or squealing all need a technician.

Repair or replace?

If the system is 12 to 15 years old and needs a compressor, coil or major refrigerant repair, pricing a replacement usually makes sense. New variable-speed systems run quieter and cheaper. Get a replacement quote.