What happens if I reset my Honeywell thermostat?

Author: Landen Breitenberg PhD  |  Last update: Wednesday, July 23, 2025

Resetting your Honeywell Thermostat can fix common issues like inaccurate temperature readings, scheduling problems, and unresponsive buttons. There are specific reset methods depending on your thermostat model (Wi-Fi, non-programmable, 5-1-1 day, etc.)..

What does reset do on Honeywell thermostat?

Resetting your thermostat can solve several issues, including:
  1. Problems with your thermostat's programming.
  2. Trouble connecting to your furnace or air conditioning unit.
  3. Inconsistent or inaccurate temperature readings.

Is it okay to reset thermostat?

Misreading Room Temperature: If your thermostat reads the wrong temperature, it won't kick the HVAC system on at the right times. Resetting can recalibrate the temperature sensor. Failure to Turn On HVAC System: A thermostat reset reboots its system and attempts to restart normal functioning.

What to do after resetting the thermostat?

Reconfigure Settings: After a reset, you will likely need to reconfigure your thermostat settings. This includes setting the date, time, and preferred temperature settings for different times of the day.

How do I get my Honeywell thermostat back on?

To turn on a Honeywell thermostat, locate the power switch or button on the device. Flip the switch to the ``On'' position or press the button to activate the thermostat. Once turned on, you can adjust the settings to control the temperature and settings in your home or office.

How to Factory Reset a Honeywell T6 thermostat?

How do I fix an unresponsive Honeywell thermostat?

Here's how you can dissect the problem:
  1. Check the Power Source: Ensure your thermostat is receiving power. Replace batteries if your model requires them or check the circuit breaker if it's hardwired.
  2. Inspect the Wiring: Over time, wiring can degrade. ...
  3. Reset Your Thermostat: Sometimes, a simple reset is all it takes.

Why do I have to keep resetting my Honeywell thermostat?

Power outages or electrical issues can cause your thermostat to reset. If your home has experienced a power outage recently, this could be the culprit. Additionally, check for blown fuses and loose connections in your HVAC system.

How do I get my thermostat back on?

DIY Thermostat Fixes
  1. Step 1: Change Batteries. ...
  2. Step 2: Check Circuit Breaker.
  3. Step 3: Check Thermostat Programming. ...
  4. Step 4: Ensure The Furnace Switch Is Providing Power To The HVAC System. ...
  5. Step 5: Facilitate Air Flow.

Why is my AC not turning on?

There are a number of reasons why your AC unit may stop working unexpectedly, including electrical problems, blockages, thermostat issues, and more. Troubleshooting includes checking your circuit breakers, thermostat settings, and replacing your air filters.

How do you know if you have a failed thermostat?

A bad thermostat can be detected when your AC or furnace is not turning on, your HVAC systems are not turning off, the thermostat not responding, your HVAC system is short-cycling, the room temperature not matching the temperature displayed on the thermostat, and the programmed setting resetting themselves.

How can you tell if your home thermostat is not working properly?

7 Ways to Tell Your Thermostat Is Broken
  1. The Thermostat Has No Power. ...
  2. The AC or Furnace Won't Turn On. ...
  3. The Heater or AC Won't Turn Off. ...
  4. The Thermostat Reading Doesn't Match the Room Temperature. ...
  5. The Thermostat Doesn't Respond. ...
  6. The HVAC System Is Short Cycling. ...
  7. The Thermostat Forgets Programmed Settings.

What does a reset button do?

Many computers, especially older models, have user accessible "reset" buttons that assert the reset line to facilitate a system reboot in a way that cannot be trapped (i.e. prevented) by the operating system, or holding a combination of buttons on some mobile devices.

Do you need to reset a Honeywell thermostat after changing batteries?

Battery replacement: If your thermostat uses batteries and they need to be replaced, you might have to do a reset to ensure everything functions properly. Seasonal changes: When moving between heating and cooling seasons, you may need to do a reset to adjust the temperature for the new season's temperatures.

What does the hold button do on the Honeywell thermostat?

Using the “hold” function on your system means you can suspend the program if you'll be away from home for a while, such as while you're on vacation. This means you can tell your HVAC to stay put at a specific temperature to keep your pipes from freezing in winter but as warm as you want it to be for comfort.

How to do a full factory reset on honeywell?

For Latest Honeywell Scanners:

Use the single bar code 'DEFALT' command to reset the device. Note: This selection erases all settings and resets the scanner to the original factory defaults.

How do I override the settings on my Honeywell thermostat?

Press up or down to immediately adjust the temperature. This will temporarily override the temperature setting for the current time period.

Why is my thermostat not kicking on my AC unit?

Replace Dead Batteries

While some thermostats are hardwired, many use batteries or have batteries as a backup power source. Dead batteries are one of the most common reasons a thermostat may fail to turn on the air conditioning system, leading to a loss of connection and inability to activate the HVAC system.

How do I force my AC to turn on?

Check Your Circuit Breaker

Locate your main circuit breaker and switch it back to the "On" position. Wait 30 seconds and turn on your air conditioner again. If it still doesn't work, you'll need to call a professional for help.

Why isn't my Honeywell thermostat turning my AC on?

Some possible solutions include resetting the thermostat to factory settings, checking the circuit breaker, replacing the air filter, checking the outdoor unit, checking the indoor unit, replacing the thermostat's batteries, and checking the connections and wiring for any damage.

What does resetting a thermostat do?

Just like your cable modem, a digital thermostat needs a reset every once in a while to kick it back into shape and set it in proper working order. You will know when a reset is necessary because your thermostat will not be regulating the temperature of your home as well as it was before.

Why is my Honeywell thermostat not turning on?

Honeywell thermostat not turning on? Usually, the first culprits of a failed Honeywell thermostat are the batteries. While today's modern batteries can last quite a few years, they will all eventually run out of power. In addition, a number of factors can cause them to fail prematurely.

How do you reset a Honeywell thermostat?

Access the Menu: Tap the menu icon on the thermostat's touch screen. Hold Down the Weather Button: Press and hold the weather button for five seconds. This will bring up the reset menu. Select Reset Option: Navigate through the options until you find “Factory Reset.” Tap on it to select it.

How do I know if my Honeywell thermostat is broken?

Your Heater and Air Conditioner Won't Turn On

If you hear clicking, but the heater and air conditioner won't respond, it usually means you have a broken thermostat. An issue with the relay switch or the motherboard could cause this problem. It could also be a case of faulty wiring.

How do I know if my Honeywell thermostat needs to be replaced?

Signs You Need a New Thermostat
  1. Heating or cooling system will not turn off or on.
  2. The temperature reading is incorrect.
  3. Recent spike in your energy bill.
  4. Frequent temperature fluctuations.
  5. Thermostat is 10 years old or older.

Why is my Honeywell thermostat on permanent hold?

Your thermostat stays on hold because either a temporary hold or a permanent hold setting has been activated, overriding your scheduled settings. This means the temperature will remain at the chosen setting until it is manually changed.

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