How to Change Battery in Honeywell Thermostat Th8321wf1001? Detailed Guide

Navigating the world of thermostats can sometimes be a bit challenging, especially when it comes to maintenance tasks like changing the batteries.

For Honeywell thermostat users, understanding how to change battery in Honeywell thermostat th8321wf1001 and other models is crucial for ensuring continuous and efficient operation.

This guide aims to simplify the process, providing clear and concise instructions tailored to various Honeywell models.

We’ll explore not just the specifics of changing batteries but also delve into when it’s necessary, identify your model, and determine the type of batteries required.

Whether you own the advanced 8000 series or the more basic 1000 series, this guide will ensure your Honeywell thermostat continues to function effectively, keeping your space comfortable and energy-efficient.

When Should You Change the Batteries?

Now, speaking of Honeywell thermostats replacing batteries, although changing the batteries is very easy, sometimes with different models, there are some variations in the process.

Hence, we will be helping you understand those variations.

Also, not all thermostats run on batteries, so if you want to check if yours is a battery-run device, you should check if it has an LED display.

If it does, then your device is running on batteries.

Now, coming to the main question how to change battery in honeywell thermostat th8321wf1001 and other series and when should you change?

For better clarity, Honeywell thermostat th8321wf1001 is typically known as 8000 Honeywell Thermostat.

Generally, changing the batteries once a year would be best.

Although the battery’s lifespan also largely depends on your general use, one set of batteries lasts for about a year.

Also, once the batteries are about to expire, you get enough warnings from the device.

The first warning that you get is about 60 days before the battery expires.

Here, the LED screen flashes, low battery, or battery needs to be replaced repetitively on the screen.

It is better to be prepared and change the battery before your device dies.

This notification will keep flashing not one day but continuously with breaks in between once you enter the last 60 days of the battery life.

How Do You Find the Model Number and Why Is It Necessary?

how to change battery in honeywell thermostat th8321wf1001

Next on, Honeywell thermostats replacing batteries. Let us talk about why it is necessary.

As we discussed, each thermostat model has a different way of changing its batteries.

So, to know the right way to remove the battery from your device and replace it with a new one, you will have to know about the model you are using, that is, the model number.

This information will ensure that you go in the right direction to do the work.

Now that we know why you need to know your device’s model number, we will discuss where to spot it.

If you are lucky enough, most devices have the number printed at the front of the model.

In this case, finding the model number is no big deal.

However, if you see that your device does not have the model number printed on it, then there can be 2 places where you can find it.

It is either on the back of the device (you must remove it from the base to check it) or on the LED display.

If it is on the display itself, then again, you will not have to go through much trouble to find it, but if it is on the back of the model, then there are a few more steps involved.

What Kind of Batteries Does Your Thermostat Require?

Next, on Honeywell thermostats replacing batteries, we need to know the type of battery your thermostat needs.

There are generally two types of batteries that are required for a thermostat. It is either AA or AAA.

Also, there are two types of covers for a thermostat. Some of them have a sliding cover; you can slide the device off the base plate just as you did to check the model number.

But let us say your device does not have a sliding compartment feature; then, you must remove the cover plate from the device and gently separate it from the base plate.

Even doing this is not very difficult; you might need some extra effort to do that.

How to Change Battery in ‘Honeywell Thermostat Th8321wf1001’ and Others

1. 8000 Honeywell Thermostat Battery

Honeywell TH8321WF1001 Touchscreen Thermostat WiFi Vision Pro 8000 with Stages Upto 3 Heat / 2 Cool
  • With a large touchscreen display, the VisionPRO 8000 WiFi Programmable Thermostat makes it easy to...
  • Program a schedule for every day of the week or control the temperature remotely anytime from the...
  • Adaptive Intelligent Recovery
  • Schedule for Energy Savings

This is a brand-new model with a lot of the latest features. This model is compatible with wifi and a large-screen display.

In this model, you can also set the schedule for the day or even the entire week and control the temperature from any remote location easily through the Total Connect Control App.

Now, coming to the part of changing the batteries. First, let us tell you that this series of Honeywell thermostats will require 3 AAA batteries. Here are the following steps:

  • The first step is basic, and this goes for all thermostats; you need to switch off the current supply, and it takes it out of the electrical outlet for your safety.
  • After this, hold the base plate properly and pull off the front cover. Holding the base plate will help you exert the required force to pull out the front cover.
  • Once the front has been separated, you will see the battery compartment. There, replace the old batteries with the 3 new AAA batteries. Make sure you check the polarity of the batteries properly.
  • Put the front cover back on the device, secure it, and plug the thermostat back into its position.

And that is it. Your thermostat’s battery has been changed, and it will start to work like before.

2. 6000 Honeywell Thermostat Battery

Honeywell TH6220WF2006/U Lyric T6 Pro Wi-Fi Programmable Thermostat with Stages Up to 2 Heat/1 Cool...
  • 4-1/16 in. Long x 4-1/16 in. Wide x 1-3/32 in. Deep
  • 20 to 30 vac
  • 37 f to 102 f
  • 4-1/16 in. Long x 4-1/16 in. Wide x 1-3/32 in. Deep

Next, we will talk about the 6000 series on Honeywell thermostats replacing batteries.

This model, too, comes with a feature to schedule the program for the thermostat in advance.

This does not just make your work easy, but it also saves a lot of energy.

Apart from that, it has a big backlit LED display showing both the room and set temperatures.

Along with all these, one of the biggest benefits of this model is its wireless installation, which is highly convenient for consumers.

The batteries will require AA batteries instead of AAA (as needed in the 8000 series); honestly speaking, changing the batteries for the 6000 is comparatively easier because of the sliding battery compartment.

Now that we know about the basic features and the type of batteries this model will require, let us talk about changing the dead batteries from this thermostat:

  • Please switch off the power supply to the thermostat, as we have already discussed.
  • Then, press on the back cover and pull it off to remove the battery holder. Remember that if you are not pressing it right, then the cover from the bottom might not come off that easily.
  • Next, slide out the battery compartment. Please take out the old, dead batteries and replace them with new AA batteries.
  • Ensure that you have checked the polarity of the batteries properly. The (+) and the (-) sign will help you determine the polarity.
  • Secure the cover back on the base plate like it was before.

You can now switch on your thermostat.

3. 5000 Honeywell Thermostat Battery

The Series 5000 comes with a lot more features. Its large backlit display makes reading the numbers very easy, even in a dark or dimly lit room.

The second-best thing is that it can automatically change between a cooling or heating system depending on the room temperature. It also has the option to adjust the font size at your convenience.

Speaking of changing the batteries, the best part here is that accessing the battery compartment in the 5000 models is very easy because it has a sliding battery compartment, and you do not have to separate the cover from the base plate as we did in the previous models. Speaking of the battery type, for the 5000 model, you will need AA batteries.

Here are the steps that you need to follow to change the batteries of this series:

  • First, turn off the power supply as usual for your safety.
  • Next, press and pull the cover to remove the battery compartment from the top right corner.
  • Then, take out the battery compartment, remove the old batteries, and replace them with the new AA batteries. As usual, make sure that you check the polarity properly.
  • Now, place the cover back on the top like before.

Now, you can switch on the thermostat; the batteries have been successfully replaced.

4. 4000 Honeywell Thermostat Battery

Honeywell 105841 TH4110D1007 Programmable Thermostat, 3-13/16" High x 5-3/8" Wide x 1-1/4" Deep,...
  • HONEYWELL Pro 4000 5-2 programmable digital thermostat 1 heat/1 cool white
  • Model - TH4110D1007
  • This is manufactured in United States
  • Weekday/Weekend programming - 5-2 (Weekdays, Weekend) programming

The 4000 series comes with air cleaners, a large backlit display for easier readability, energy-saving benefits, a scheduling program, and an inbuilt compressor protection system.

The controls are also great for this series and give you good control over the temperature, fan speed, etc.

Also, the quality of the product and the battery life is great. For this model, you will need AA batteries.

Now, we will discuss the steps that are involved in changing the batteries of the 4000 series:

  • Firstly, as usual, remove the thermostat from any source of electricity. Make sure that you are not exposed to any live wire.
  • Next, remove the cover plate. To do that, push the plate from the bottom. It will come out.
  • Next, replace the old dead batteries with the new AA batteries and check the polarity again.
  • Then, put the cover back in its place and secure it firmly.

Your thermostat is now ready for use.

5. 3000 Honeywell Thermostat Battery

This model, too, comes with a compressor protector so that the air conditioner compressor and the heating compressor are well protected.

Also, this model has easy-to-read backlit LED screens with easy-slinging switches that make controlling the temperature and the fan easy.

Now, we are going to discuss the process of changing the batteries for this model:

  • Firstly, as usual, you must cut off the power supply for protection.
  • Press and pull off the cover plate from the base plate to access the battery compartment.
  • Once you find out the battery compartment, replace the old batteries with the new ones.

And your thermostat is all set and ready to be used again.

6. 2000 & 1000 Honeywell Thermostat Battery

Honeywell TH4110U2005/U T4 Pro Program Mable Thermostat, White
  • Country Of Origin: United States
  • Model Number: TH4110U2005/U
  • Item Package Dimension: 6.49999999337" L x 5.099999994798" W x 2.299999997654" H
  • Item Package Weight: 13.8 oz

Lastly, we will talk about the 2000 and 1000 series of the Honeywell thermostat.

These are best suited for you in case you are on a budget. It comes with the usual features of program scheduling and a backlit display with easy controls

Steps involved in changing the battery in these two series:

  • As mentioned before, cut off the power supply to ensure your safety.
  • Separate the base plate and the cover plate. To do this, you need to pull the plate from the bottom.
  • Once you find the battery compartment, replace the old batteries with new AA batteries.
  • Put the cover plate back in its place and secure it firmly in its place.

And that is it. That is all you need to do to change the batteries from these two devices.

Guide to Change the Battery in Some Other Models-

Apart from the series of models we have mentioned above, a few more models are available on the market,, so we would also tell you about the process of changing their batteries.

Additional Guide to Adhere While Replacing Batteries

Now that we have talked how to change battery in honeywell thermostat th8321wf1001 and in other sereies, there are a few things that you need to keep in mind while changing the batteries:

  • The best-suited batteries for most Honeywell thermostats are AA or AAA alkaline batteries; if you are still confused, we recommend that you refer to the user manual provided with the device. The best companies to purchase thermostat batteries are Duracell and Panasonic.
  • Once you change the thermostat’s battery, the low battery signal goes away, and it goes back to its usual functioning. However, if you see that even after changing the battery, the symbol of low battery is still flashing then do not worry, just reset the device and it will be fine.
  • If you see that after a while of showing the low battery symbol, the LED display of the thermostat has turned black, then again, you do not have to worry. Your thermostat has gone into a power-saving mode, and it will be back to normal once you change the batteries,
  • Always remember to cut off the power supply to the thermostat when you are working with it, that is, changing its battery, Or you might be exposed to a live wire and get a fatal shock.
  • Your thermostat will inform you about the low battery 60 days in advance, but that does not mean you should wait until the end. Be it your thermostat or any other device, waiting until the last moment to change the batteries can damage them in the long run.

Wrapping it Up

Maintaining your Honeywell thermostat, including models like the th8321wf1001, doesn’t have to be a daunting task.

By following the steps outlined in this guide, you can easily change the batteries of your thermostat, ensuring it operates smoothly.

Remember, regular battery replacement is key to preventing interruptions in your thermostat’s function and maintaining the comfort of your home.

With different models requiring specific battery types and methods for replacement, this guide serves as a comprehensive resource for managing your thermostat’s power needs.

Armed with this knowledge, you can confidently tackle the battery replacement process, contributing to the longevity and efficiency of your Honeywell thermostat.

Mila Patel

Mila Patel is an expert in consumer technology and household appliances who earned her degree in industrial design from Georgia Tech. She brings over a decade of experience from her time at Consumer Reports and as a freelance product reviewer. Her professional journey includes working with major appliance manufacturers and contributing to home improvement magazines. Her hobbies include interior design and staying updated with smart home trends. She also enjoys cooking and experimenting with the latest kitchen gadgets in her free time.

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