Your heat pump is an essential part of your home because it delivers year-round comfort. But, like any home comfort system, it’s bound to encounter some problems once in a while.

Let’s examine these problems and how much they might cost to fix, so you’ll have some idea before you call an HVAC technician. Some of the most typical heat pump repair problems include:

  • Heat pump won’t turn on
  • Heat pump won’t turn off
  • Heat pump won’t defrost
  • Heat pump won’t cool
  • Heat pump won’t turn on after changing thermostat
  • Heat pump won’t heat

1. Heat Pump Isn’t Turning On

There are a lot of reasons why your heat pump won’t turn on, so we suggest checking all of them. Sometimes they are as easy as restoring a thermostat setting or changing your air filter.

Here’s what to check:

  • Is your thermostat on the right setting? If you want air conditioning, make sure it’s set to “cool,” “auto” and that your setting is lower than the ambient temperature. If you want heating, it should be set to “heat,” “auto” and your setting should be greater than the current temperature. If you use a programmable thermostat, put in new the batteries if the screen appears jumbled or blank.
  • Has the circuit breaker been tripped? Your heat pump won’t be able to operate if it lacks power. Reset the corresponding breaker if it’s facing the outside of the electrical panel.
  • Is the air filter clogged? A dirty air filter is difficult for your heat pump. If you can’t see light through it, it’s time to replace it.

If these steps don’t correct the problem, you’ll need to contact a heating and cooling company like True Temp.

Estimated Repair Cost

This issue can be complex, so how much it costs to correct it will depend on what’s wrong.

2. Heat Pump Can’t Shut Down

If it’s very hot or cold outside, your heat pump may need to run longer than normal to achieve your desired temperature.

If the weather is normal, check that your thermostat is set correctly and operating normally. If the fan setting is at “on,” the blower motor on your air handler will run 24/7. So, it’ll appear as though your heat pump is working all the time. Constantly using the blower can keep humidity levels in check, but it’ll also drive up your electrical bills.

If your thermostat is set correctly, there are several other problems that could be causing your heat pump to run all the time. They include:

  • A new thermostat that isn’t appropriate for your heat pump.
  • A malfunctioning compressor contactor, which controls the flow of electricity.
  • Leaky ductwork.

Estimated Repair Cost

This can be linked to many issues, so your heat pump repair cost will depend on the problem and how complex it is.

3. Heat Pump Won’t Defrost

Every now and then during cold weather, your heat pump will temporarily go into cooling mode. This will melt light frost and ice that normally builds up on the coils. A heat pump that becomes totally frozen may have difficulty heating your home or shut down completely.

Here are a few reasons why this might be taking place:

  • Your heat pump doesn’t have sufficient airflow because it’s obstructed by snow, bushes or yard debris.
  • Your gutters are dripping water on top of your heat pump, creating an icy buildup.
  • A part is not working, which may consist of the reversing valve, relays, controls or sensors.
  • The outdoor fan motor is damaged, dying or dead.
  • Your heat pump has a refrigerant leak. This is possible if you’re hearing bubbling or hissing noises. Or if you discover a sweet, formaldehyde-like odor close to the outdoor unit.

Estimated Repair Cost

Like we discussed before, there are a lot of reasons why your heat pump won’t defrost. But here are several estimated costs for some of these issues. Keep in mind your cost may vary based on your heat pump brand, model and the degree of the issue.

  • Replace reversing valve: $200–$600
  • Replace outdoor fan motor: $250–$650
  • Repair refrigerant leak: Depends on the kind of refrigerant your heat pump uses. R-22 Freon is pricier since it’s no longer being produced.

4. Heat Pump Won’t Cool

Just like a heat pump that won’t turn on, a heat pump that won’t cool can be associated to many problems. We recommend checking for:

  • Ideal thermostat settings
  • Tripped circuit breakers
  • A clogged air filter
  • Ice on your heat pump

If there’s nothing awry with your thermostat, circuit breakers or air filter, you’ll need assistance from an HVAC technician to diagnose a problem with your ductwork or an iced-over heat pump. Like we reviewed earlier, a heat pump that won’t defrost might have an issue with its reversing valve, outdoor fan motor or a refrigerant leak.

Estimated Repair Costs

These repair costs are estimates. Your total expense may vary based on your heat pump brand, model and the scope of the problem.

  • Replace reversing valve: $200–$600
  • Replace outdoor fan motor: $250–$650
  • Repair refrigerant leak: Depends on the kind of refrigerant your heat pump uses. R-22 Freon is pricier since it’s no longer being produced.
  • Seal leaky ductwork: Depends on house size.

5. Heat Pump Malfunctions After Changing Thermostat

If your heat pump won’t turn on after changing the thermostat, the problem is probably tied to your new thermostat. While you can install just about any thermostat with a furnace, the same isn’t accurate for heat pumps, especially if you have backup or emergency heating.

You can test your new thermostat by changing the fan mode to “on.” If you don’t hear the blower motor running in your air handler, there’s probably a problem with the thermostat.

A couple other common thermostat problems involve:

  • Wiring was done incorrectly.
  • Thermostat isn’t interacting with heat pump.
  • Thermostat is in emergency heat mode, which involves a reset.

It’s wise to have a heating and cooling pro recommend a thermostat and expertly install it. That way, you’ll avoid any compatibility or wiring issues.

Estimated Repair Costs

The cost of professional thermostat installation depends considerably on what type of thermostat you want. While programmable thermostats are cheaper, they are missing the advanced features and convenience of a smart thermostat.

6. Heat Pump Won’t Heat

A heat pump that won’t heat is linked to similar problems with a heat pump that won’t cool. We suggest checking for:

  • Correct thermostat settings
  • Tripped circuit breakers
  • A clogged air filter
  • Ice on your heat pump

An icy heat pump or leaky ductwork will require the help of an HVAC technician. Ductwork is tricky to reach since it’s located behind walls and numerous issues can cause your heat pump to freeze up.

Estimated Repair Costs

These repair costs are estimates. Your total cost may vary based on your heat pump brand, model and the extent of the problem.

  • Replace reversing valve: $200–$600
  • Replace outdoor fan motor: $250–$650
  • Repair refrigerant leak: Depends on the type of refrigerant your heat pump uses. R-22 Freon is higher priced since it’s no longer being made.
  • Seal leaky ductwork: Depends on house size.

Take Care of Those Heat Pump Problems Right Away with Help from Local Experts

Dealing with a malfunctioning heat pump can be frustrating, but not when you get in touch with True Temp. Our professionals have been providing the quality, affordable heat pump repair Port St. Lucie homeowners have depended on since 2021. Get in touch with us at 772-202-2963 to request your free estimate now.

Average repair costs are sourced from Fixr, which compiles estimates based on nationwide averages.