Honeywell Thermostat Battery Replacement Manual

Last updated on April 12th, 2024

Some of the Honeywell thermostats are battery-operated. They use AA or AAA batteries to power the device. The type and number of batteries vary from model to model, which we will discuss in this article. These are not rechargeable batteries so you need to replace them from time to time.

So, we will see how do you replace batteries in a Honeywell thermostat. Is the Honeywell thermostat battery replacement procedure the same for all models? Do we need to take any precautions? We will find all that out in the coming sections.

Honeywell thermostat battery replacement is required when the thermostat:

  • Flashes a low battery notification
  • Has a blank screen
  • Screen fluctuates

Identify your model of Honeywell thermostat

To replace batteries in a Honeywell thermostat, you need to know what model it is. This information is vital as it will tell you which type of batteries you need, how many batteries you need, and where they are located. So you can buy new batteries of the same type and replace them based on where they are located.

The batteries are usually located on the side or inside the base plate. The base plates also have two types – one with hinges and the other without hinges. So, based on the type of base plate and location of the batteries, the procedure to replace the batteries changes.

Location of battery

To give you a better idea of what you should expect with your Honeywell thermostat battery replacement, here’s a table containing detailed information about their batteries. We start by stating different series and the models that fall under this series. Then, we look at the type and number of replacement batteries required. Lastly, we see where they are located.

Honeywell thermostat seriesModels coming under the seriesType of batteriesNumber of batteriesLocation of batteries
1000 SeriesTH1100DV, TH1110DV, TH1210DVAAA batteries2Under the cover plate
2000 SeriesTH2110DV, TH2210DVAAA batteries2Under the cover plate
3000 SeriesTH3110D, TH3210DAA batteries2Under the cover plate
4000 SeriesTH4210D, TH4110DAA batteries2Under the cover plate
5000 SeriesTH5110D, TH5220D, TH5320UAA batteries2On the side
6000 SeriesTH6110D, TH6220D, TH6320UAA batteries2On the side
8000 SeriesTH8110U, TH8320U, TH8321UAAA batteries3Under the cover plate
Round SeriesLyric RoundAAA batteries1Under the cover plate
Honeywell thermostat battery replacement instructions

Old Honeywell thermostat battery replacement instructions

Now that we know the different locations of Honeywell batteries, we will see how to replace batteries in each of these locations. In the following sections, we discuss the detailed procedures for these.

1. Models with a side battery door

This procedure to replace batteries in a Honeywell thermostat only applies to models with a side battery compartment. These include models from the 5000 and 6000 series. Here are the step-by-step instructions:

Replacing thermostat batteries with side battery door
Replacing thermostat batteries with side battery door

Step 1: Turn the device off by sliding the power switch.

Step 2: Locate the ‘Press’ button on the top-right edge of the device.

Step 3: Press that button and slide off the battery compartment.

Step 4: Remove the battery cover.

Step 5: Take out the old batteries and replace them with new ones.

Step 6: Replace the battery cover.

Step 7: Insert the battery compartment back into its place.

Step 8: Slide the power switch back on.

2. Models with hinges

Replacing thermostat batteries with hinges
Replacing thermostat batteries with hinges

Some of the models have hinges on the top side. This prevents you from pulling off the cover plate directly towards you. That’s why there is a dedicated procedure to change the Honeywell thermostat battery of models with hinges. Here’s how it goes:

Step 1: Turn the device off by sliding the power switch.

Step 2: Hold the bottom of the cover plate and pull it towards you but in a slightly upward direction.

Step 3: Take the panel off the hinges.

Precaution: Don’t try to pull it without tilting upwards, or you could break the frame.

Step 4: Take out the old batteries and replace them with new ones.

Step 6: Replace the cover plate by sliding it into the hinges.

Step 7: Slide the power switch back on.

3. Models without hinges

Replacing thermostat batteries without hinges
Replacing thermostat batteries without hinges

Models that do not have hinges are comparatively easy to open. The following is the detailed process for changing the batteries of a Honeywell thermostat without hinges:

Step 1: Turn the device off by sliding the power switch.

Step 2: Pull the cover plate off by applying a little pressure.

Step 3: Take out the old batteries and replace them with new ones.

Step 4: Replace the cover place by pressing it into place.

Step 5: Slide the power switch back on.

Conclusion

Honeywell thermostat battery replacement is vital if you want it to operate without disruption. You can know when to replace them from the indication on the screen or from the notification on the mobile app.

Then, you can bring replacement batteries that your model uses. It is easier to buy the right replacement batteries if you know the model number or series of your device. Or you can check which batteries were previously used.

Follow the correct procedure based on the type of model you own so you have a smooth replacement process. And don’t apply unnecessary pressure, or you could break the device.

FAQs

What kind of battery does a Honeywell thermostat take?

A Honeywell thermostat either uses AA or AAA batteries based on which model you have.

What happens if you don’t replace the thermostat battery?

If you don’t replace the thermostat battery, then the device will power off, and you won’t be able to change the cooling and heating settings.

Can a Honeywell thermostat work without batteries?

An analog Honeywell thermostat can work without batteries, but digital models cannot.

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Siddhi Gurav

She is the editor and content writer at Smart Home Bulls. Siddhi merges her passion for language with SEO expertise. With 4 years of experience as a creative writer and a passion for smart home technology, she fits in perfectly at Smart Home Bulls. Her wide experience in content marketing has been an excellent addition to our team.

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