When and why to reset your heat pump

A reset clears temporary errors that make your heat pump stop heating or cooling without actually breaking the unit. Most resets take under five minutes and work when your system won't turn on, cycles on and off repeatedly, or shows an error code on the display. A reset does not fix mechanical failures like a refrigerant leak or a broken compressor — those need a technician.

Heat pumps have two types of resets: a soft reset (power cycle) that clears the control board, and a hard reset (factory reset) that erases all your settings and returns the system to default. Start with a soft reset first. If that does not work, move to a hard reset. If neither works after 30 minutes, the problem is likely mechanical and you should contact a service technician.

Key Takeaways

  • A soft reset means turning the power off for 30 seconds, then back on — this fixes most temporary errors without erasing your settings.
  • Turn off power at the breaker switch in your electrical panel, not just at the thermostat, so the entire system truly powers down.
  • A hard reset erases all your temperature schedules and preferences, so use it only after a soft reset fails.
  • If the heat pump still will not start after both resets, the problem is mechanical and requires a service call.

How to do a soft reset (power cycle)

A soft reset is the first step and the one that works most often. Locate your electrical panel — usually a gray or metal box on an exterior wall, in a basement, garage, or utility room. Open the door and find the breaker labeled for your heat pump. It may say "Heat Pump," "HVAC," or "Air Handler." If you are unsure which breaker it is, check your home's electrical diagram taped inside the panel door, or look for the breaker that is slightly out of alignment with the others.

Switch the breaker all the way to the OFF position. Wait 30 seconds — this gives the control board time to fully discharge. Then switch it back to ON. The heat pump will take 5 to 10 minutes to restart and run its startup sequence. During this time, you may hear clicking, humming, or brief fan noise as the system initializes. Do not turn the breaker back off during this period.

Once the system has restarted, check your thermostat display. If it shows a temperature reading and responds to button presses, the soft reset worked. Set your desired temperature and listen for the compressor to start within a few minutes. If the system still shows an error code or will not respond, proceed to a hard reset.

How to do a hard reset on your thermostat

A hard reset erases your temperature schedules, preferred settings, and any custom programming, so only do this after a soft reset has failed. Most thermostats have a reset button or a reset option in the menu. Check your thermostat manual or the manufacturer's website for the exact location — common spots are a small recessed button on the back or bottom of the unit, or a menu option under "Settings" or "System."

If your thermostat has a physical reset button, use a straightened paperclip or a pen tip to press and hold it for 10 to 15 seconds. The display may go blank or show a startup screen. Release the button and wait for the thermostat to restart — this usually takes 30 seconds to 2 minutes. If your thermostat uses a menu-based reset, navigate to Settings, find "Reset" or "Factory Reset," and confirm the action. Again, wait for the system to fully restart before testing.

After a hard reset, your thermostat will return to default settings — usually 72°F (22°C) and a basic schedule. You will need to reprogram your preferred temperature and any schedules you had set. Check whether the heat pump now responds and begins heating or cooling. If it still does not work, the issue is not a software error and a technician will need to inspect the unit.

Resetting a heat pump with a dedicated reset switch

Some heat pump systems have a separate reset switch on the outdoor unit or on the indoor air handler. This switch looks like a small red or black button, usually located on the side or back of the unit. If your system has one, a reset switch is faster than cycling the breaker because you do not have to go to the electrical panel.

Press and hold the reset button for 3 to 5 seconds, then release. You should hear a click as the button resets. Wait 5 to 10 minutes for the system to restart. If you do not see a reset button on your outdoor unit, check the indoor air handler — it may be mounted in a closet, attic, or basement. Your system manual will show you exactly where the button is located if your unit has one.

What to do if the reset does not work

If your heat pump still will not start or continues to show an error code after both a soft reset and a hard reset, the problem is mechanical rather than a control board error. Common mechanical issues include a tripped safety switch (often caused by low refrigerant or a frozen coil), a failed compressor, or a broken capacitor. These problems require a licensed HVAC technician to diagnose and repair.

Before you call a technician, write down any error codes displayed on your thermostat and note when the problem started. If the outdoor unit is making unusual noises (grinding, squealing, or rattling), mention that as well. This information helps the technician narrow down the cause and may affect the repair cost. Do not attempt to repair the outdoor unit yourself — refrigerant handling and electrical work require certification and specialized tools.

Common mistakes to avoid during a reset

The most common mistake is turning off only the thermostat instead of the breaker. The thermostat controls the system, but the control board stays powered as long as the breaker is on. A true power cycle requires cutting power at the breaker. Another mistake is not waiting long enough — 30 seconds is the minimum for a soft reset, but waiting a full minute is safer and does not cost you anything.

Do not reset the system more than twice in a row. If a soft reset and a hard reset both fail, additional resets will not help. Repeatedly cycling power can sometimes damage the control board or capacitor, so stop and contact a technician instead. Also, avoid resetting during extreme weather — if it is very cold outside and your heat pump is not working, you need heat now, not a reset that might take 10 minutes to show results. In that case, switch to emergency heat (usually a button on the thermostat) and call a technician the same day.

Frequently Asked Questions

How long should I wait after turning off the breaker before turning it back on?

Wait at least 30 seconds. This gives the capacitors on the control board time to fully discharge. Waiting a full minute is even better and does not hurt anything. If you turn the breaker back on too quickly, the reset may not clear the error.

Will a reset erase my temperature schedule?

A soft reset (power cycle) keeps your schedule. A hard reset erases everything and returns the thermostat to factory defaults, so you will need to reprogram your preferred temperature and any schedules you had set up.

What if my heat pump has an error code I do not recognize?

Write down the exact code and try a soft reset first. If the code returns after the reset, look up the code in your system manual or on the manufacturer's website — it will tell you what part may have failed. If you cannot find the manual, contact the manufacturer's customer service line with the model number and error code.

Can I reset the heat pump in the middle of winter if it stops heating?

Yes, but switch to emergency heat first (usually a button on the thermostat labeled "EM Heat" or "Aux Heat"). This keeps you warm while the reset happens. A soft reset usually takes only 5 to 10 minutes, but do not wait — call a technician the same day if the reset does not fix the problem.

Is it safe to reset the heat pump myself?

Yes, a soft reset is completely safe — you are just cycling power. A hard reset is also safe. However, do not open the outdoor unit or try to repair any internal parts. If the reset does not work, a technician must handle the repair.