How to Change Honeywell Thermostat Battery?- Easy Steps

A Honeywell thermostat is a kind of thermostat that uses a battery that provides power to the thermostat to give the readings of the temperatures of a room and control them. Not all Honeywell thermostats use batteries to provide power to them due to the difference in making. In case of any signs with the thermostats when working, it shows that the thermostats need immediate change. Therefore, follow the steps depending on how the manufacturers instruct on how to use the thermostat.

A battery in a  Honeywell thermostat needs replacements immediately after failing to work as it can cause discomfort to an individual in a room. Before taking any action with the battery, ensure you read the manufacturer’s instructions on the thermostat, understand them and apply them in the replacement process to make work easier.

Types and steps of changing Honeywell thermostat battery

There are different Honeywell thermostat batteries with various steps that one must follow when replacing the batteries. Some thermostats are intelligent and modern thermostats assume analog thermostats. Below are the steps of changing a Honeywell thermostat battery with the different types of ordinary Honeywell thermostats.

1. Honeywell thermostat RTH2300 seriesHow to change Honeywell thermostat battery

Honeywell thermostat RTH2300 series uses a flashlight as a source of warning from the Lo Batt on the display screen thermostat. Replacing the batteries is kind of hard and needs help from a technician as it consists series of steps to follow that include;

  • Adjust the settings of a Honeywell thermostat to an auto position to turn on or off when in need.
  • Switch off the switch that determines whether the temperatures are to be warm or cold.
  • Disconnect the thermostat from its position by gently pulling it.
  • Find the position of the batteries, which are two in this case.
  • Remove the older batteries and replace them with new batteries carefully to avoid damaging the other parts of the thermostat.
  • Return the thermostat to its position by placing it gently and ensuring all the mounting parts fix each other as it produces a clicking sound.

2. Honeywell thermostat 1000 series and 2000 seriesHoneywell thermostat 1000 series and 2000 series

1000 series and 2000 series thermostats are almost identical in that the 2000 series has a flat battery while the 1000 series has a vertical thermostat. A Honeywell thermostat 1000 and 2000 series needs replacement now and then since they rarely indicate that the battery is terrible in their system. The Honeywell thermostat above has two major parts in its system, which are the control panel and the cover surface on the wall. The following steps guide on how to replace its battery;

  • Switch off the Honeywell thermostat to prevent electrical damages.
  • Displace the thermostat from the wall by removing it gently using your hands as you handle it carefully.
  • Turn the Honeywell thermostat to have a clear view of the back end where the battery is.
  • Remove the cover surface that covers the thermostat at the back.
  • Locate the position of the battery for changing.
  • Remove the bad battery from the thermostat by unscrewing all the screws holding it.
  • Place the new battery in the position of the older battery.
  • Return the thermostat to the wall and turn it on to confirm if it is working correctly.

3. Honeywell thermostat 3000 and 4000 versionsHoneywell thermostat 3000 and 4000 versions

A Honeywell thermostat with this version is programmable and hence quicker when reading and regulating the temperatures. Such thermostats notify the owner when the thermostat is wrong and needs replacements by warning using a flashlight. To replace the batteries, follow the steps below;

  • Switch off the Honeywell thermostat.
  • Remove the thermostat from the wall by drawing it gently at its lower edges.
  • Turn the thermostat to see the back area and remove the cover surface.
  •  Locate the older battery and remove it.
  • Place the new battery to the position as per the instructions.
  • Return the thermostat to its normal position and switch to adjust its settings.

4. Honeywell thermostat 5000 and 6000 versionsHoneywell thermostat 5000 and 6000 versions

The Honeywell thermostat 5000 and 6000 series has the location of the battery at the top of the Honeywell thermostat. When opening the battery, you need to remove the cover panel to access it. The steps to replace such batteries is simple as follows;

  • Turn off the Honeywell thermostat when replacement time arises.
  • Find the battery at the top side of the thermostat.
  • Click a release button to allow the removal of the battery and remove it from its holder.
  • Fix the new battery on the thermostat and close the battery holder for proper function.
  • Switch off the thermostat for normal operations.

5. Honeywell thermostat TH800 versionHoneywell thermostat TH800 version

The Honeywell thermostat TH8000 version is a type of Honeywell thermostat that supports the backup of the battery to pass through when the connection of power is lacking at the time. The Honeywell thermostat TH800 version gives a warning via the Lo Batt as it shows in the front area of the thermostat. Follow the steps below to change the battery in the thermostat accurately.

  • Put off the Honeywell thermostat TH800 before replacing the battery.
  • Disconnect the Honeywell thermostat from the wall for easy access to the battery for replacement.
  • Flip the thermostat to access the back end and remove the cover panel from the thermostat.
  • Find the older battery and remove it from its position.
  • Fix the new battery at the location.
  • Hook up the thermostat back to the wall and turn it on.

FAQs About How to Change Honeywell Thermostat Battery?:

  • What are the signs of a defective thermostat that needs replacement?

1. Poor readings with the Honeywell thermostat

 A poor thermostat that needs repair or replacements will fail to display the particular readings it should show and keeps setting the readings carelessly on its own. In case of such signs in the thermostat or sometimes the thermostats, the screen turns to be blank without readings. Consider changing the thermostat.

2. The battery keeps shutting down

A faulty Honeywell thermostat battery will keep shutting down every time it is in use and can keep showing low levels of power in the battery and cannot give the exact condition of the area. If the battery is deficient, the Honeywell thermostat will switch off and fail to communicate to produce the result for the thermostat. The Honeywell thermostat’s indication is very low because it produces an LED flashlight every time it is shutting down to show that it is shutting down as some use the Lo Batt that is the modern programmable thermostat.

3. High temperatures of air in a room

When the temperatures of air in a particular room are very high, it indicates that there is no regulation of air in that room and that the thermostat’s battery has some issues with it. In case of such changes in temperatures and not returning to normal, the Honeywell thermostat needs serious replacement immediately. As too much damages to the thermostat without repair, the thermostat will misbehave, bringing false readings with the house condition.


Replacing a Honeywell thermostat is an easy task, so long you follow the steps in the article above according to the type of thermostat you are using. The article shows the various steps with the different types of thermostats that exist. Unfortunately, some thermostats have a series of steps that can confuse the user, and it is advisable to call a professional for more explanations.

In the process of changing the Honeywell thermostat batteries, consider following the manufacturer’s instructions that contain the directives of the specific thermostats and how to handle them. Read and understand the instructions before taking any activity on the battery. Always consult a technician to help fix minor issues that you cannot recognize.

I’m not a professional technician, just sharing my personal experience and if you find my video useful, please perform all repairs at your own risk. Thank you.

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