How to reset the air conditioner: easy DIY air conditioner guide (2023)

vonJosef m

Central air conditioners are devices that cool your home. They are easy-to-use devices with multiple functions.

What if your air conditioner suddenly stops working or doesn't cool as expected? Resetting is one of the most effective and easiest ways to ensure your drive is working properly and efficiently.

But where do I find the reset button on the external air conditioner? Read on to learn all about resetting your air conditioner.

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Why do you need to reset your central air conditioner?

How to reset the air conditioner: easy DIY air conditioner guide (1)

last power outage

If the circuit turns on and does not allow the unit's compressor to work properly, you need to reset it. Circuit breakers trip when you experience a power outage or a sudden drop or surge in power.

It is a crucial part that protects and prevents the device from explosion and fire. If this is the case, make sure to reset your AC system.

The thermostat is defective

A reset also works if the air conditioner is blowing warm air and not cooling as usual, even though the thermostat setting is "cold".

While there are many reasons why your system is blowing hot air, the most common is a faulty thermostat. Oftentimes, resetting the drive can resolve this issue.

Related articleCan I reset my thermostat?

(Video) How to Reset Your Air Conditioner Unit | Easy!

defect parts

In addition, you may also need to reset your air conditioner if its internal part is damaged or not working properly causing it to work erratically.

Related articleWhere can I get AC spare parts?

Where is the reset button on central air conditioners?

If your AC system is equipped with a reset button on a condenser unit, push it and it will do the job. But where is it?

It is located on the bottom outside of the machine. The button is usually visible and red, making it very easy to find.

If you can't find it from the outside, it's most likely inside the machine, just behind the dash panel. Be sure to disconnect power from the AC system before entering the unit to look for the "Reset" button.

How to reset the air conditioner: easy DIY air conditioner guide (2)

How to reset your central air conditioner using the reset button

About the reset button

To reset the device using the reset button:

Press gently for 3-4 seconds and leave for a while. Then repeat the same process and leave it for a while. Your air conditioner will respond with three beeps; This means your system has restarted successfully.

Manual (no reset button)

(Video) Tricks to help you troubleshoot ptac unit easier...

If your air conditioner is not equipped with a reset button, you will need to reset it manually. Manually resetting an air conditioner is quick and easy. See how to do it:

1. Turn off the power supply

There is a cut-off bar on the side of the outdoor compressor unit. This is where the cable from your air conditioner is connected. And in typical situations, it stays on. Turn it off and find the 240 circuit breaker on the main electrical panel inside the house. Turn it off too. This allows you to shut off all power to your AC device. Also, be sure to disconnect the system from the main power supply.

2. Wait 20 to 30 minutes

Never reconnect the device immediately after disconnecting. 20 to 30 minutes is more than enough time to fully reset your device.

3. Reconnect it

Carefully reconnect the device to the network.

4. Turn on the power supply

After connecting the system, go to the mains and turn it on. After that, go back to the compressor outdoor unit and plug in the connector. Remember, before turning the unit back on, make sure your thermostat is set to 'cold'.

How to restart after a power failure

turn off the thermostat

If you turn the thermostat setting to "Off", the air conditioner will not be prompted to cool the room until you reset the external and internal circuit breakers.

Some thermostats are battery operated; Therefore, you can easily solve the problem by changing the batteries. However, if the thermostat is not programmable or is programmable, follow the steps below.

Reset the 'circuit breaker'

It is usually placed in the basement, laundry room, garage or outside of your home. Locate the circuit breaker and the HVAC/A/C label. However, if you can't find the label, look for a button that isn't "off" or "on".

(Video) How to Reset Your Air Conditioner

Turn this knob to the off (right) position and back to the on (left) position! Then wait half an hour.

Set your thermostat to cool

How to reset the air conditioner: easy DIY air conditioner guide (3)

When the 30 minutes have elapsed, turn the thermostat setting back to cool and the air conditioning will turn back on. Make sure the room temperature is at least 6 degrees above your thermostat's temperature for your device to cool the room.

Reset guide after filter change

Are you looking for a simple and effective way to reset your air conditioner after a filter change? Follow these steps to reset your drive:

  1. Press the filter switch on your thermostat
  2. Then press the down or up button to change or reset it

How to reset the most common AC brands after changing the filter:

  1. Press the filter switch or the "i" button until "air" is displayed
  2. Now gently press the "Time" up arrow button to restart your air conditioner

Related articleHow to change the AC filter

What to do if your central air conditioner won't restart

If your air conditioner still won't restart or work properly, consult an HVAC professional.

Here are some scenarios where it is better to turn to a professional than to do it alone:

  • If you have exposed wires and the switch doesn't have a protective cover
  • If the circuit trips from time to time
  • Your air conditioner is taking longer than normal to cool the room
  • If there are loose connections
  • If the device is not properly maintained and cared for
  • If you haven't checked your air conditioner in a while

Related articleWhat to do if the air conditioner keeps tripping the circuit breaker?

People also ask (FAQ)

How do I reset my portable air conditioner?

How to reset your portable air conditioner:

  1. Turn off the device and the circuit breaker
  2. Firmly press the "Reset" button and let it sit for a few minutes
  3. Then plug the breaker back in and turn on the air conditioner.

How long does it take to reset an air conditioner?

Although it varies by model, the average time it takes for an air conditioner to restart is around 30 minutes. After unplugging, sit comfortably for at least half an hour.

How do I reset my AC thermostat?

To reset your AC thermostat:

  1. First turn off the thermostat.
  2. Locate the circuit feeding the AC power and turn it off
  3. Wait 2-3 minutes. Then turn on the switch
  4. Then switch on the thermostat and you're done.

What happens if you don't restart your air conditioner after power outages?

It is important that you restart your device whenever there is a power outage; otherwise you may cause serious damage to your device, circuit breaker, etc. In addition, the circuit breaker can trip or explode, which is essential to avoid fire or other explosions.

(Video) Air Conditioner Easy Trick To Reset Sometimes Stubborn Goodman Condenser Service Panels Easier


Air conditioners offer a fast, effective, and efficient way to cool your home. They are perfect home appliances that will make your interior cozy even in the summer heat. However, if it stops working or doesn't cool down as expected, you can use our comprehensive guide to reset it.

Related articleHow long does the air conditioner have to sit idle before it turns on?

Related articleWhat to do if the air conditioner does not turn on?

Last updated on July 15, 2022

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Josef m

My name is Josh and I am obsessed with the HVAC industry. I created this website to help HVAC technicians of all levels get the most out of their heating and cooling systems. I've spent thousands of hours studying air conditioning, heating, and home air products so you can study and shop with confidence. Learn moreabout the team here.

(Video) How to Reset an AC Thermostat

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Where is the reset button on my air conditioner? ›

Look for it first around on the exterior of your machine, especially along the bottom edge near the ground. An AC's reset button is typically red and visible, so it should be easy to spot. If you don't see a reset button on the outside, it could be located inside the unit behind the service panel.

How do you clear AC codes? ›

How to perform a Master Reset:
  1. Go to where the outdoor air conditioning unit is.
  2. Locate the isolator switch on the unit or on the wall beside the unit, which looks like a commercial on/off electrical switch.
  3. Turn the switch off and leave it off for an hour.
  4. Turn the isolator switch back on after an hour.
May 27, 2022

How long does it take for an air conditioner to reset? ›

After you've turned the system back on, it will take a bit of time for the air conditioner's internal circuitry to reset. It usually takes about 30 minutes, so sit tight until then.

Where is the reset button? ›

How to perform Factory Reset on Android smartphone?
Where is the reset option?
  1. Tap Settings.
  2. Tap General & Backup and reset.
  3. Tap Factory data reset.
  4. Tap Reset device.
  5. Tap Delete all.

Why is my air conditioner not cooling? ›

Perhaps the most common cause of AC issues is clogged filters. Dirt, pet hair, pollen and dust can clog your filters. When filters get clogged, they begin to restrict the flow of air through your AC. The result is that the AC doesn't cool your indoor air effectively.

How do you reset automatic window switch? ›

Hold the key down for 2-5 seconds after the window is down.

Once your window is all the way down, hold the button down for 2-5 seconds. Release the button after you've held it down for a short period of time. On some vehicles, the required time to reset the window is 2 seconds.

Why is my AC screen not working? ›

When your screen is blank, it could indicate you need to replace the batteries. It that is the case, you typically need AA alkaline or 3-volt lithium batteries, but see what type is currently powering the thermostat and simply replace them. Most thermostats display a low-battery symbol when the juice is running low.

Why is my AC display not working? ›

Thermostat Batteries Died and Need to be Replaced

If your thermostat is blank, the first thing you should do is check the batteries. Chances are, the batteries have died and the thermostat simply can't power on. Replace the batteries and see if your thermostat turns on.

What does it mean to clear codes? ›

When a code clears, you know that the vehicle has been restored to good working order. However, there could be occasions when clearing the codes manually is part of the repair process. For example, a check engine light can be triggered when the gas cap isn't tightened correctly.

Can AC reset itself? ›

They'll typically restart themselves and refresh the system after cycling through a few tries. But your thermostat may or may not do this. If it doesn't, then you might need to call out a professional to help you out. They can probably restart the thermostat manually to fix the issue.

What does AC code mean? ›

AC stands for "Accepted Code" and is commonly phrased as 'Here is my AC Solution' aka 'Here is my Accepted Code Solution. '

What does an AC reset switch look like? ›

Some air conditioning systems have a reset switch, which is a small, red button. Typically, the button will be on the outdoor unit. If you have a problem locating it on the outdoor unit, you may find relevant details on the equipment's manufacturer's manual. Press the red button for three seconds and release.

How do I get my AC to work again? ›

If your air conditioning system just isn't turning on then we suggest you run through a few things before calling in an HVAC expert:
  1. Make sure the outdoor breaker fuse is positioned correctly.
  2. Check your electrical panel for a tripped breaker.
  3. Confirm that your thermostat is switched on.
  4. Check for a clogged air filter.
Jun 25, 2021

How do I get my air conditioner to work again? ›

If your AC is not cooling but runs:
  1. Turn off the power.
  2. Clean or change the air filter to improve airflow.
  3. Look to see if ice has formed on the coils and, if it has, turn on the power and the fan to melt it.
  4. Clean the condensate drain.
  5. Finally, check and clean the outdoor compressor.
Jan 20, 2021

What are reset settings? ›

When you perform a factory reset:
  • All the data and apps found on your Android smartphone or tablet are wiped. ...
  • All the user accounts found on your Android smartphone or tablet are deleted.
  • All your Android device's settings are restored to their defaults.
  • Your Android operating system is reset.
Jun 4, 2020

How do I turn off or reset? ›

Most Android phones can be restarted by holding the Power button and then selecting Restart or Power off and restart from the Power Options menu. Note: Newer Samsung devices require you to hold the Power / Side button and Volume Down to make the Power Options menu appear.

Where is reset in control panel? ›

Control panel reset.
  1. Click Search.
  2. Type restore.
  3. Open create a restore point.
  4. Click the system restore button.
  5. Hit Next.
  6. Pick a restore point (Preferably a date before the issue happened)
  7. Wait for the process to finish.
Jun 7, 2022

Why won t my air conditioner cool below 75? ›

Well, certain problems can prevent an air conditioner from properly cooling down your home including: A dirty air filter. A blocked condenser. A refrigerant leak.

Why is my thermostat set to cool but AC not turning on? ›

Air Conditioner Won't Turn On

Be sure the thermostat is set to “cool” mode and the temperature is set low enough to call for the A/C to come on. Look for a tripped circuit breaker or blown fuse. If you're satisfied that the system is getting power, a faulty thermostat may be preventing the system from turning on.

Why is my AC blowing hot air? ›

If your air conditioner is blowing out warm air, your unit's refrigerant levels might be low. This usually indicates a refrigerant leak in your system! If that's the case, your air conditioner will continue to run and blow out warm air, trying to reach the temperature you set on your thermostat.

What is window Reset? ›

Resetting reinstalls Windows 10, but lets you choose whether to keep your files or remove them, and then reinstalls Windows. You can reset your PC from Settings, the sign-in screen, or by using a recovery drive or installation media.

What is the Reset button on windows? ›

Answer: Press the ''F11'' or ''F12'' key when you restart the system. Select the option to reset to factory settings. The system will then boot itself with restored factory settings.

How do I Reset my window screen? ›

But, if your desktop is messing up, you can choose to reset display settings Windows 10.
Now, here is the tutorial.
  1. Open Windows Settings.
  2. Then choose System.
  3. Click Display from the sidebar, and then click Advanced Scaling settings.
  4. Clear previous settings and choose Apply.
Oct 18, 2021

How long does it take for a permanent code to clear? ›

The whole drive cycle must take at least 10 minutes. After performing a Universal Trip Drive Pattern, the computer clears the code, since it's “seen” that the problem is fixed and not reoccurring.

Does clearing codes reset readiness? ›

Why is a monitor incomplete or “not ready” Clearing the diagnostic trouble codes (DTCs) and the Check Engine Light will reset the monitor statuses too. This typically occurs during or after vehicle repair.

Does disconnecting battery reset codes? ›

Leaving the battery disconnected for a few minutes will ensure the vehicle systems will completely reset when you reconnect the battery. Secure the negative cable back to the terminal and cover it with the cap. Disconnecting the battery will clear the error codes and reset the check engine light.

Why is my outside AC unit not turning on? ›

Look for a Tripped Breaker

If your AC won't turn on, you can check two places for a circuit breaker or electrical panel. Older homes have a main electrical panel on the outside of the home or a circuit panel on newer homes. Check the electrical panel to see if the breaker is tripped. Reset it if it is.

Why is my AC fan not kicking on? ›

If the fan won't start even with a kick-start, and you hear the compressor running, you probably have a bad fan motor. This is more common with systems that are poorly maintained or that operate where a lot of dirt/debris is blown around by the wind. The only thing you can do about a bad motor is to have it replaced.

What is E1 error code? ›

2022. When the Washing Machine is displaying E1 in the panel, it is indicating an error in the water supply. The appliance is not detecting that the unit is filling with water.

What is AC error code E9? ›

Water flow is insufficient Yes Check the water piping and valves. Make sure the water piping is clean, there is no air in the water piping and all valves are open. Make sure the water pump capacity is enough.

What is AC error code E3? ›

The E3 error code displays when an Abnormal Operation Protection Error has occurred, and activates to protect the unit from damage. This error code will require service. Sanmi is a Home Appliance expert and author of this help library article.

Is there a reset button on compressor? ›

A reset button can be found inside the air conditioner's compressor. Typically, the button is red in colour and modest in size. 1.

How do I reset my AC pressure switch? ›

Locate the high pressure switch near the compressor (a cylindrical device piped into the refrigeration system with two wires a red button on the top). Push in the button to reset. Push the rocker switch to restart the unit.

How do I know if my AC switch is bad? ›

If the AC is cutting on and off rapidly, unable to cool the cabin, or failing to turn on the compressor, you should replace your AC pressure switch.

Why is my outside AC unit running but no air blowing inside? ›

The most common problems that cause a lack of airflow include frozen coils, broken fan and restricted airflow due to dirty air filters or vent obstruction. However, there are many other issues that can lead to minimal airflow, so it may be necessary to ask the professionals.

Why is my AC not responding to my thermostat? ›

Clogged air filters are one of the most common reasons a thermostat clicks but AC does not turn on. A filter cleans the air before it circulates throughout your home, trapping dirt particles, dust, and pollen. Over time, these contaminants will clog the filter, limiting airflow to the HVAC system or furnace.

Why does my AC click but won't turn on? ›

Check Your Thermostat

This is usually due to your AC's relay turning your AC on and off. If that clicking is loud and/or continues for more than a few seconds, you probably have an issue with a broken relay or a worn wire in your thermostat. Contact a professional technician to identify and fix the problem.

Why is my AC outside unit not turning on? ›

Look for a Tripped Breaker

If your AC won't turn on, you can check two places for a circuit breaker or electrical panel. Older homes have a main electrical panel on the outside of the home or a circuit panel on newer homes. Check the electrical panel to see if the breaker is tripped. Reset it if it is.

Why is my AC outdoor unit not starting? ›

The AC unit won't turn on

Usually when the outdoor unit doesn't turn on, it is because something tripped the circuit breaker. When this happens, you can easily reset it after locating the circuit breaker panel. If you find that the AC unit still does not work, the next place to look is the thermostat.

How do I force restart my AC? ›

How to Reset an Air Conditioner
  1. Power down your AC. Start at your circuit breaker panel and flip the breaker that powers your AC. ...
  2. Find the button. Most air conditioning units are equipped with a reset button. ...
  3. Hold down the reset button for 3 to 5 seconds and then release.
  4. Restore power to your AC.

How do I know if my AC fuse is blown? ›

If you think your air conditioner has blown a fuse, the first sign you'll notice is that the outside AC unit is inoperable. The best way to check for a blown fuse is by using a voltmeter. Be warned — you are working with live electricity and should use extreme caution when troubleshooting your system.

What causes the AC to stop working? ›

If your air conditioning unit has stopped working, there are many possible reasons that can explain why. It could be your thermostat, your air filter, a problem with the condenser or compressor, or it may just be time to replace the unit, especially if it's over 10 years old.


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