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Honeywell Thermostat Battery Replacement: What You Need To know

by Nick Evans | Last Updated: November 18, 2021

If you are trying to figure out how to replace the battery in your Honeywell thermostat, you have come to the right place.

Honeywell thermostats are popular thermostats that regulate the temperature of your home using a combination of AC power and battery power. These thermostats connect with air conditioning and heating units to control when they’re activated. In the summer, thermostats regulate temperature and humidity by activating the air conditioning, and in the winter thermostats regulate temperature by activating heating units like furnaces.

If you have a Honeywell thermostat you have to replace the batteries at some point. Even if your Honeywell thermostat only uses the batteries to control temporary AC power interruptions they need to be changed at least once every two years. For models that use batteries as the primary source of power, you’ll have to change the batteries more frequently.

That said, we’re going to take you through everything you need to know about Honeywell thermostats and provide you with steps to change the batteries for each model. Read on to learn more! 

how to replace battery in honeywell thermostat

Knowing When to Change a Honeywell Thermostat Battery 

Changing your Honeywell thermostat’s batteries is an important part of owning a Honeywell thermostat. If you fail to change the batteries and there is an interruption to the AC power you can damage the thermostat or have it temporarily stop working. Therefore, you need to change your thermostat’s batteries when needed.

Most Honeywell thermostats alert you when the battery needs to be changed. The alert comes around 60 days before batteries need to be replaced. Many Honeywell models display battery levels on the LED screen, so you can also use that for reference.

Even if your Honeywell thermostat only uses batteries as a backup source of power, you need to change them when the batteries begin to lose power.

What Type of Battery Does a Honeywell Thermostat Have?

Honeywell thermostats typically run on a combination of AC power and AA or AAA batteries. Most Honeywell thermostats use AC power as the primary power supply and draw energy from batteries if there is an issue with the AC power supply. This is why many thermostats have batteries that last for months and years.

What You’ll Need to Replace a Honeywell Thermostat Battery 

There are many Honeywell Thermostat models, so you need to know which one you have before grabbing tools and getting started. While you’ll only need a screwdriver and replacement batteries for the replacement part, finding the model number is trickier. That said, a Honeywell thermostat model number will look like this: TH1210DV (the model number for a Honeywell thermostat in the 1000 series).

You can follow these steps to locate the model number of your Honeywell thermostat:

  1. Isolate the circuit to avoid getting shocked if your Honeywell thermostat is connected to your home’s main circuit.
  2. Remove the thermostat from the baseplate. We recommend pulling from the bottom on some models if you’re having trouble to avoid damaging the pins that hold it in place.
  3. Look for the model number on the side or back of the thermostat.
  4. Place the thermostat back on the wall.

If you follow these steps you can find the model number for your Honeywell thermostat. Finding the model number will help you determine which product you have and what instructions you need to follow to replace the battery.

Read also: How to unlock your Honeywell thermostat

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Replacing the Honeywell Thermostat on Each Model

If you know what model number you have and which Honeywell thermostat you’re working with you can go ahead and begin replacing the battery. Each model has different batteries and replacement steps, so we’re going to take you through the steps for changing the batteries in the following Honeywell thermostats:

1000 and 2000 Series 

The Honeywell 1000 and 2000 series are common in apartment buildings and multi-family homes. Many landlords use these thermostats because they offer quality without sacrificing quality. They feature a basic LED display and work with air conditioning units and heating units.

Here are some common models that fall in the 1000 and 2000 series:

Every model in the 1000 and 2000 series requires two AAA batteries.

The steps you need to follow to replace the batteries are as follows:

  1. Isolate the circuit for your safety and turn the thermostat off.
  2. Remove the cover plate from the baseplate –be gentle here to prevent damage to pins and other things used to secure the cover.
  3. Remove the old AAA batteries.
  4. Add the new AAA batteries.
  5. Double-check that you have the batteries in the right order.
  6. Place the cover plate back on.
  7. Reconnect the circuit and make sure your thermostat works.

You can follow these steps for every Honeywell thermostat in the 1000 and 2000 series.

3000 Series 

Honeywell thermostats in the 3000 are simple and effective products. These thermostats come with additional features like built-in protections for your air conditioner’s compressor. Models in the 3000 series also feature a display screen that’s easy to work with.

While the 3000 series runs on AC power, it needs a battery replacement after a year or two. Batteries are used in the 3000 series to counteract any fluctuations in AC power. 3000 series models provide you with a warning 2 months before you need to replace the batteries.

Some common models in the Honeywell 3000 series include:

Both models in this series use AAA batteries.

Once you’re ready to change the batteries the steps are:

  1. Isolate the circuit and turn off the thermostat.
  2. Pull from the bottom of the Honeywell thermostat to remove the cover plate from the base plate.
  3. Remove the AAA batteries.
  4. Add new AAA batteries.
  5. Make sure the batteries are connected properly and in the right position.
  6. Slide the cover back onto the base plate.
  7. Connect the circuit and test the thermostat.

These steps will work for every Honeywell thermostat model in the 3000 series.

4000 Series 

Thermostats in the Honeywell 4000 series are more robust than their predecessors and come with upgraded features. One example is how the LED display is more in-depth than 1000, 2000, and 3000 series models. The upgraded screen displays things like temperature, battery life, the date, time, and the status of the thermostat.

The 4000 series also comes with a handful of features that allow you to set the temperature, control the fan, and adjust emergency settings. The two models found in the 4000 series are the:

All 4000 series Honeywell thermostats use AA batteries.

Similar to other Honeywell thermostats, changing the batteries can be done by following these simple steps:

  1. Turn off the thermostat and Isolate the circuit to prevent injuries.
  2. Detach the cover plate from the base plate by pulling from the bottom.
  3. Remove the AA batteries.
  4. Replace the AA batteries.
  5. Make sure the batteries are in the right positions.
  6. Place the cover plate back on the base plate.
  7. Connect the circuit and test the thermostat.

Following these steps will help you change the batteries on every Honeywell thermostat in the 4000 series.

5000 Series

Honeywell 5000 series thermostats are loaded with advanced features and built-in safety precautions. The 5000 series has a sliding battery compartment that allows you to change the batteries without removing the cover plate from the base plate. Moreover, Honeywell 5000 series thermostats come with an Auto Changeover feature that allows the thermostat to activate heating or air conditioning on the same day. This is based on indoor and outdoor temperatures and works well in regions that experience fall and spring.

Common models in the Honeywell 5000 series include:

Honeywell 5000 series thermostats use AA batteries and the steps you can follow to change the batteries are:

  1. Turn off the thermostat.
  2. Remove the battery holder (top right corner) by pressing and pulling the cover plate.
  3. Detach the battery compartment.
  4. Remove the AA batteries.
  5. Replace the AA batteries.
  6. Put the cover plate back in place.
  7. Turn the thermostat back on and test it out.

Following these steps will help you replace the AA batteries found in every Honeywell 5000 series thermostat.

6000 Series 

Honeywell thermostats in the 6000 series perform better than earlier models and come with upgraded features. Models in the 6000 series come with features that allow for setting heating and cooling schedules. Honeywell thermostats in the 6000 series also feature a well-rounded LED display and several preset programs.

Models found in Honeywell’s 6000 series include:

Honeywell thermostats in the 6000 series use AA batteries instead of AAA batteries like some earlier models.

The steps to change the batteries in Honeywell 6000 series models are:

  1. Turn the thermostat off and disconnect the circuit.
  2. Remove the battery holder, which is located on the top right corner of the thermostat. Be gentle and pull the cover plate to remove the battery holder.
  3. Detach the battery holder.
  4. Remove the AA batteries.
  5. Replace the AA batteries.
  6. Make sure the batteries are positioned properly.
  7. Slide the battery holder back into its compartment and make sure it’s secure in the base plate.
  8. Turn the thermostat on and test it out.

These steps only vary in some 6000 series models but not by much. The only variation is in how much effort it takes to remove the battery compartment from the base plate and how durable the pins are.

8000 Series 

Honeywell 8000 series thermostats are reliable, well-made, and advanced. Thermostats in this series feature touchscreens, WIFI capabilities, and smartphone connections. With 8000 series thermostats, you can control the temperature, humidity, schedule, and other things by using your smartphone. Honeywell completely revamped its product for the 8000 series models.

Honeywell thermostats in the 8000 series include:

Models in the 8000 series use AAA batteries but the steps needed to change the batteries are similar to earlier models. The main difference with 8000 series Honeywell thermostats is that there are two ways to remove the cover. There is the basic pull design and the hinge design. When replacing the battery, knowing which one you have is crucial.

Hinge

The steps to replace a Honeywell 8000 series thermostat battery with the hinge design is:

  1. Disconnect the thermostat from the circuit and turn the power off.
  2. Place your thumbs at the base of the thermostat and on your other fingers on top.
  3. Pull from the bottom in an upwards direction to unhook the faceplate from the hinges on the baseplate.
  4. Remove the AAA batteries.
  5. Replace the AAA batteries.
  6. Double-check that AAA batteries are positioned properly.
  7. Put the cover plate back on the base plate by realigning the top hinges on the faceplate with the top hinges on the baseplate of the thermostat. Push from the bottom and it will snap back into place. 
  8. Turn the thermostat on and test it.

Basic Pull

The steps to replace a Honeywell 8000 series thermostat with the basic pull design are:

  1. Disconnect the thermostat from the circuit and turn it off.
  2. Put one hand on either side of the thermostat’s faceplate.
  3. Wiggle the faceplate until it comes loose from the baseplate
  4. Remove the AAA batteries.
  5. Replace the AAA batteries.
  6. Double-check that AAA batteries are positioned properly.
  7. Put the cover plate back on the base plate by pushing the faceplate over the baseplate. Make sure it has a snug fit before turning the thermostat back on.
  8. Turn the thermostat on and test it.

While the 8000 series of Honeywell thermostats introduced new and improved models, the steps to change the batteries are straightforward.

Lyric Round 

Honeywell also has Lyric Round thermostats. These thermostats are unique models that have come a long way over the last few years. Lyric Round thermostats are designed for location-based temperature control and regulation. These thermostats can connect with your phone and feature geofencing technology, which helps the thermostat identify the temperature of where your smartphone is located and it adjusts your heating or air conditioning needs accordingly.

The model number we’re focusing on for our steps below is the RCH9310WF. It’s also important to note that the Lyric Round thermostat can connect with most products like Apple watches, Samsung watches, and other smart technology products.

The steps to change the batteries in Lyric Round thermostats are:

  1. Turn off the thermostat.
  2. Remove the thermostat from the sub-base.
  3. Remove AAA batteries.
  4. Replace AAA batteries.
  5. Double-check that the batteries are in the right place.
  6. Add the faceplate back to the sub-base.
  7. Turn on the thermostat and make sure it works.

The Lyric Round thermostat by Honeywell continues to evolve each year, so some of these steps are subject to change.

HCW80 

The HCW80 thermostat by Honeywell is designed to work with the relay module (HC60NG). These two pieces combine to make the Y6630D1007 package. The combination of these units is used to send temperature information across large areas. Communication between units is wireless and the relay module makes changes and activities heating or cooling based on temperature readings from HCW80.

HCW80 Honeywell thermostats use AA batteries. The batteries have a lifespan that lasts for around 2 years. Users can also make manual changes to the temperature but this comes at the expense of battery life. 

You can replace the batteries by following these steps:

  1. Turn the thermostat off.
  2. Separate the cover plate from the base plate.
  3. Remove the AA batteries.
  4. Replace the AA batteries.
  5. Make sure the batteries are in the right position.
  6. Reattach the cover plate.
  7. Turn on and test the thermostat.

HCW80 are niche thermostats that work well if you prefer the two-unit setup.

RTH110B

RTH110B Honeywell thermostats are unique options with niche uses. This is because the RTH110B thermostat is not compatible with heating pumps. That said, it does work with air conditioning units, hot water systems, select heating systems, and fuel-based furnaces. The benefit of the RTH110B thermostat is that it comes with a built-in thermometer.

RTH110B thermostats use AA batteries and the system provides notifications when batteries are running low. Like other Honeywell thermostats, the steps to replace the batteries are simple.

These steps include:

  1. Switch off your thermostat.
  2. Remove the cover plate by wiggling it.
  3. Remove the batteries.
  4. Replace the batteries.
  5. Check the battery position.
  6. Put the cover plate back on.
  7. Turn on and test the thermostat.

Regardless of the Honeywell thermostat you have, changing the batteries is a simple process that shouldn’t take you more than 5 minutes.

Keep the Power Flowing 

Honeywell thermostats are great products that help you regulate the temperature of your home. These thermostats come with many advanced features, LED screens, and even niche uses. 

That said, one thing every Honeywell thermostat has in common is its use of batteries. Even if they’re used as a backup source of power, Honeywell thermostats use AA or AAA batteries that need to be replaced. The good news is that if you follow the steps we provided you’ll have no issue changing the batteries on any Honeywell thermostat model.

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