How To Replace Battery In Honeywell Proseries Thermostat

Top 10 Honeywell Round Thermostat Battery Simple Home
Top 10 Honeywell Round Thermostat Battery Simple Home from


Are you having trouble with your Honeywell ProSeries thermostat? One of the common issues that homeowners face is a low or dead battery. In this article, we will guide you through the process of replacing the battery in your Honeywell ProSeries thermostat. With just a few simple steps, you can have your thermostat up and running again in no time.

Step 1: Turn Off the Thermostat

Before you start replacing the battery, it is important to turn off the thermostat to prevent any electrical mishaps. Locate the power switch or circuit breaker that controls the thermostat, and switch it off.

Step 2: Remove the Thermostat Cover

Once the power is off, carefully remove the cover of your Honeywell ProSeries thermostat. You may need to use a screwdriver to loosen the screws that hold the cover in place. Take your time to avoid damaging the thermostat or any of its components.

Step 3: Locate the Battery Compartment

Inside the thermostat, you will find a battery compartment. It is usually located at the back of the device. Look for a small door or panel that can be opened to access the batteries. Once you find it, gently open the compartment.

Step 4: Remove the Old Batteries

Now that you have access to the battery compartment, carefully remove the old batteries. Pay attention to the correct orientation of the batteries, as indicated by the plus (+) and minus (-) signs. Improperly inserting the batteries can damage the thermostat or cause it to malfunction.

Step 5: Replace with New Batteries

Get your new batteries ready. Make sure they are the correct type and size recommended by Honeywell for your ProSeries thermostat. Insert the new batteries into the compartment, following the correct polarity. Ensure a snug fit and close the battery compartment door or panel.

Step 6: Reattach the Thermostat Cover

Once the new batteries are in place, reattach the thermostat cover. Make sure it is properly aligned and securely fastened. Use a screwdriver to tighten the screws, if necessary. Be careful not to overtighten as it may damage the cover or the thermostat itself.

Step 7: Turn On the Thermostat

Now that everything is in place, it’s time to turn on the thermostat. Locate the power switch or circuit breaker that you turned off in Step 1 and switch it back on. The thermostat should power up, and you can proceed to adjust the settings as needed.

Step 8: Test the Thermostat

After replacing the battery, it is essential to test the thermostat to ensure it is functioning correctly. Set the desired temperature and check if the thermostat responds accordingly. If everything is working as expected, you have successfully replaced the battery in your Honeywell ProSeries thermostat.

Tips and Precautions

Tip 1: Battery Life

Keep in mind that the battery life of your Honeywell ProSeries thermostat may vary depending on usage and environmental factors. It is recommended to replace the batteries every 6 to 12 months to ensure optimal performance.

Tip 2: Battery Recycling

When disposing of the old batteries, make sure to follow proper recycling guidelines. Many communities have designated recycling centers or drop-off points for batteries. Do not throw them in the regular trash as they can be harmful to the environment.

Precaution: Electrical Safety

Always prioritize your safety when working with electrical devices. If you are unsure or uncomfortable with any steps in the process, it is best to consult a professional or contact the Honeywell customer support for assistance.


Replacing the battery in your Honeywell ProSeries thermostat is a simple task that can be done in a few easy steps. By following our guide, you can ensure that your thermostat continues to function effectively, providing you with the comfort and convenience you need in your home.