Honeywell thermostats are some of the most trusted and reliable thermostats on the market—but even the best technologies are subject to necessary reset and repair! If your home seems to be off a few degrees, if you’ve noticed your energy bill going up unexpectedly, or if your thermostat fails to trigger your heating and cooling system, it may require a reset.

What Is Wrong with My Honeywell Thermostat?

Resetting your thermostat can solve several issues, including:

  • Problems with your thermostat’s programming
  • Trouble connecting to your furnace or air conditioning unit
  • Inconsistent or inaccurate temperature readings

What Honeywell Thermostat Do I Have? 

To reset your thermostat, you’ll need to know the model. If you still have the product packaging or the thermostat ID card, your model number will be written on either of those items. If you don’t have that packaging on hand, you can remove your thermostat from the wall and locate the product number on the back of the wall plate.

Most thermostats can be gently lifted from the wall without tools. Pull evenly from either side of the thermostat. If it won’t come off, you may need to search online to find models based on their resemblance to your thermostat.

Resetting a Honeywell Thermostat

For battery-powered thermostats, there is a quick way to perform a thermostat reset. Here’s how:

  1. Power off the thermostat and remove the batteries.
  2. Put the batteries in the wrong way, with negative to positive and positive to negative.
  3. Wait ten seconds and put them back in the correct way.
  4. Your thermostat will be reset to factory settings. Be sure to reprogram your thermostat to your normal schedule.

Not all Honeywell thermostats use batteries. Those that don’t are hardwired to the home’s electrical system. For guidance to reset thermostats that don’t require batteries, look at this handy resource.

For more on how to replace Honeywell thermostat batteries, read on.

How to Replace the Batteries in a Honeywell Thermostat

If your unit does require batteries, replacing them is easy. If your screen looks dim or goes blank, don’t get worried until you replace the batteries. Here’s how to do it.

  1. Remove the faceplate of the thermostat. Most thermostats will simply pull off with even, firm pressure. Some models have small tabs on the top and bottom. A few seconds of inspection should make it clear whether your model has tabs.
  2. Remove the old batteries. Depending on your model, the unit may take AA or AAA batteries. Look at the batteries you are replacing to confirm the right size.
  3. Install the new batteries into the battery compartment.
  4. Put the faceplate back onto the backplate. Once it is reconnected, the thermostat display should turn back on. Take a moment to confirm that any programmed settings are still stored correctly by selecting the Menu or Program key, depending on your Honeywell model.

If the thermostat display does not turn back on, contact One Hour for expert thermostat services.

How to Unlock a Honeywell Thermostat 

Like a factory reset, the steps for unlocking your thermostat depend on which Honeywell model you own. For most Honeywell models, however, the process is similar. Most users will need to lock or unlock their thermostat to limit how many family members can control programming or adjust the temperature.

  1. Press the Center or Menu button and enter 1234.
  2. If you are setting up your thermostat for the first time, you’ll be able to set a passcode. Save this number somewhere you won’t lose it, such as on your phone.
  3. Select the Lock option to restrict access to changing temperatures or reprogramming the unit.

I Lost the Passcode for My Honeywell Thermostat 

Don’t worry, there’s a workaround for this!

  1. Repeat the first step of the instructions above. If you get an error or incorrect warning when you input the number 1234, carry on with the steps below.
  2. Remove the thermostat from the base plate. On the back of the thermostat, you’ll find a four-digit date code.
  3. Add 1234 to the date code. For example, if the date code is 1420, then add 1420 + 1234. The new passcode would be 2654.
  4. Enter in the new passcode from the Menu option on the thermostat. Then you will be able to reset your passcode.

Troubleshooting Honeywell Thermostats 

If you tried a reset, replacing the batteries, or unlocking your thermostat to no avail, it’s time to call in the professionals. Trust One Hour to help with all your heating and cooling needs with fast, experienced technicians that can fix HVAC problems both big and small. Call (800) 893-3523 or request an appointment online to get started.