How To Fix: Honeywell Thermostat Won’t Turn On AC? (2022)

How To Fix Honeywell Thermostat Won't Turn On AC

Kids love to play with my cousin’s display screen when they come over to visit. Honeywell thermostat when they don’t understand it. I’d always expected the continual roughhousing to catch up with me eventually, and it did just that a few days ago.

The AC wouldn’t turn on when I pressed the button on my thermostat. Not only can a malfunctioning Honeywell thermostat impair your home’s heating and cooling systems, but it will also cost you a lot in energy fees.

I realized that I had to find a solution to this problem right now. As a result, I read several articles and watched numerous videos on the internet before discovering a remedy.

Your Honeywell thermostat may sometimes fail to turn on your air conditioning. Resetting your thermostat is the most straightforward solution. Battery replacement, wiring inspection, and cleaning the Honeywell Thermostat’s air filter are all popular solutions.

Honeywell Home RTH221B1039 RTH221B Programmable Thermostat, White
  • One program runs for the entire week (4 periods per day)
  • Easy to use, basic operation makes programming easy
  • Precise +/- 1 degree Fahrenheit temperature control
  • Easy to install

What Model of Thermostat Do I Have?

The ID card on your thermostat is the easiest method to identify the model. Remove the gadget from the wall plate if you don’t have the product ID card.

Most models are easy to remove from the wall. Flip the case over once you’ve detached it to see the model number stamped on the back. Numbers starting with TH or T are preceded by the letters RTH or T in some way.

Common Fixes When Your Thermostat Cannot Turn on The AC

Now that you know what kind of Honeywell thermostat you have let me guide you through some typical techniques for troubleshooting this problem.

Reset The Thermostat To Factory Settings

Depending on the model, the procedures that must be followed to reset your Honeywell thermostat might be different. Follow the steps outlined for your specific model by selecting it from the list below.

Honeywell 4000 series:

Press and hold the ‘Program’ option once the device has been turned on.

Press and hold the ‘Program’ button for one to two seconds while using a paperclip or other pointed item to reset the device.

Honeywell 6000 series:

Hold down the ‘Fan’ and ‘Up’ arrow keys for around 5 seconds before releasing them when your smartphone is turned on. Press and hold.  Press the bottom left button repeatedly until the number on the display screen changes to ’39’.

As soon as you’ve completed those steps, just hit the “Done” button to finish the process. Now that the thermostat has been reset, everything should be as it was before.

Honeywell 7000 series:

Turn off the thermostat first, and then unplug everything. Remove the wall plate from the thermostat now. There are two AAA Alkaline batteries in total. For around 5 seconds, take them out and put them back in the other way.

Now that the batteries are in the correct orientation, the display should come on. After you’ve mounted the thermostat to the wall plate, turn the power back on.

Honeywell Lyric T family

Scroll down to ‘RESET,’ then tap the ‘Menu’ button. ‘Yes, I want to do the reset. Tap Select, then pick Yes to finish the reset. If you choose ‘No,’ you’ll be sent back to the main menu.

Honeywell 8000 series

Hold down the blank button in the middle for five seconds while pressing and holding ‘System’ on the screen. Select ‘Reset to factory settings from the drop-down menu. The thermostat in your home has now been reset.

Honeywell 9000 series

Navigate to ‘Preferences’ by pressing the ‘Menu’ button. Tap ‘Yes’ after scrolling down to ‘Restore to factory default.’

Note that if you reset your thermostat, you must establish your schedules and re-adjust the clock timings regardless of the model.

Replace Batteries If You Haven’t Yet In A Long While

Replace the thermostat’s batteries as follows: (if your model uses batteries). Turn off the electricity at the circuit breaker. Remove the wall plate from the thermostat and remove it from the wall.

Put in fresh ones by removing the old ones and then putting in the new ones. Reconnect your thermostat to the wall plate and turn the power back on. 4. Attach your thermostat to the wall plate.

Check Connections And Wiring For Any Damage

Remove the thermostat face or body to see whether the wiring is still intact. There will be a white and a red wire there for you to use. By connecting these, your thermostat should be set to ‘On.’

When you connect the connections and the heating system kicks on, the thermostat is faulty. In the beginning, check whether your thermostat is set higher than the ambient temperature.

If connecting the red and white wires didn’t fix the problem, the thermostat wires may be faulty. Because working with the AC mains supply might be hazardous, it’s best not to test the integrity of the thermostat cables yourself. Instead, contact a specialist and enlist their assistance.

Replace the Air Filter If It is Clogged

If your filter is blocked, your air conditioning will have issues preventing air from passing through the vents. A leaky or overworked air conditioner is the outcome. Checking and cleaning your AC’s air filters regularly can help to keep it in good working order for longer.

As a result, they perform better and last longer. You should clean your air filters at least once a month or more often if you see anything gray or ashy on the duct side of your filter.

Contact Honeywell Support if Nothing Else Works

If none of those, as mentioned earlier factors are to blame for your Honeywell thermostat’s malfunction, it’s recommended to contact Honeywell Support. Being unable to regulate the temperature in your house may be quite unpleasant, particularly on a hot day like today.

However, with these simple and practical remedies, you will have your air conditioning up and running in no time at all. If you could not resolve the problem on your own, you might always contact Honeywell customer service.

I would also caution you from tampering with the wiring in your house excessively since your safety should always come before anything else!



How do I reset my Honeywell air conditioner thermostat?

Removing the batteries or choosing the option from the menu will allow you to reset your thermostat.

Depending on the model, the procedure might be rather different. As a result, consulting your user manual, or the manufacturer’s website is recommended.

Can the thermostat cause the AC not to work?

Yes, even if your air conditioner is not broken, it may fail to function properly owing to problems with your thermostat. It is possible, though, that resetting the thermostat would resolve the problem.

Do AC units have a reset button?

A reset button is often found on the AC unit. To discover the reset button, you’ll have to consult your AC’s owner’s handbook. You can always manually reset your air conditioner if it doesn’t have a reset button.

Best Seller List of Honeywell Thermostats:

SaleBestseller No. 1
Honeywell Home Wi-Fi 7-Day Programmable Thermostat (RTH6580WF), Requires C Wire, Works with Alexa
  • ENERGY STAR certified. Help save energy, track your heating and cooling with monthly energy reports and get personalized tips on reducing energy use.
  • C-WIRE POWER ADAPTER REQUIRED: Before purchasing, check to see if this thermostat is compatible with your home and to determine if your home needs a C-wire power adapter.
  • SMART HOME INTEGRATION. The Wi-Fi 7-Day is compatible with voice assistant devices like Amazon Alexa, Google Assistant, Microsoft Cortana, and more.
  • THERMOSTAT THAT FITS YOUR LIFE. 7-day, 4 periods per day, flexible programming lets you sync your comfort with your schedule.
  • EASY OPERATION AND INTUITIVE. Big, backlit digital display and easy controls make for a user-friendly experience.
SaleBestseller No. 2
Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy...
  • COMFORT COMES IN YOUR COLOR. Personalize your Wi-Fi Smart Color Programmable Thermostat to fit your décor.
  • YOUR SCHEDULE. YOUR WAY. Flexible programming options for your schedule or utility company’s peak rate pricing.
  • EASY OPERATION AND INTUITIVE. Bright, easy-to-read touchscreen makes for simple operation.
  • COMPATIBLE WITH: Forced air (gas, oil or electric), hot water and steam, and heat pumps with electric backup. Does NOT work with electric baseboard heat (120-240V). C-Wire required.
  • ENERGY STAR certified. Help save energy, track your heating and cooling with monthly energy reports and get personalized tips on reducing energy use.
SaleBestseller No. 3
ecobee EB-STATe3L-01 3 Lite Thermostat, Wi-Fi, Works with Amazon Alexa
  • This refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, and may arrive in a generic box
SaleBestseller No. 4
Honeywell Home RTH7600D 7-Day Programmable Touchscreen Thermostat
  • Large touchscreen display makes it easy to set your preferred temperature or set a weekly schedule for automated adjustments.
  • Set home and away temperatures to help save energy when you're not home. Temporary and permanent hold settings are also available for extended absences from home.
  • 7-Day menu-driven programming with 4 periods per day.
  • Backlit touchscreen display shows current room temperature and set point temperature simultaneously.
  • Simple and straight forward to install and use. The thermostat also has a real-time clock so it will automatically adjust for Daylight Savings Time.
SaleBestseller No. 5
Honeywell TH9320WF5003 Wi-Fi 9000 Color Touch Screen Programmable Thermostat, 3.5 x 4.5 Inch, White,...
  • Made in United States
  • Package length : 6.0"
  • Package width : 2.0"
  • Package height : 8.0"
  • Material Type: Plastic

Last update on 2022-08-11


Electronic devices are like an addiction to me. Years ago, I started my job at an audio/video installation co. Then I realized that I have a passion for home theaters. It is a perfect scope to share my different experiences about electronics and home theaters.

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