Thermostat batteries are a part of your HVAC system that you may overlook or take for granted. Thermostats require a backup plan for when the power goes out, typically in the form of a battery. Batteries ensure the HVAC system does not reset itself after a power cut. That is especially pertinent for standard and more complex “smart” models. Even those with an electrical connection rely on batteries for reliable functioning during such circumstances.
These batteries play an important role in your thermostat system. However, like any ordinary battery, they have a limited lifespan. At some point, you will likely need to replace thermostat batteries, regardless of which type of thermostat you have. This featured article will give you an overview of thermostat batteries, including how to identify them and where they are located. We will also teach you how to change them and what to consider when replacing them.
The Basics of Thermostat Batteries
There are three types of batteries for powering AC thermostats. These include AA and AAA alkaline batteries and 3V disc-style lithium batteries. Such power sources give thermostats memory for their programming and stop HVAC systems from abruptly restarting should there be electrical disruptions. Before replacing your current set of batteries, check your manual to see which kind is for your device. Also, pay close attention to any specifications regarding size, especially when selecting a lithium option.
To access the batteries in your thermostat, you will first need to remove them from the wall. You can do it by sliding it off the plate or removing a battery compartment. Then that is when you will locate the spot where they are stored. It is important to note that instructions for such may vary depending on the manufacturer and model of your thermostat.
When to Change Thermostat Batteries
For optimal performance, it is best to switch out the batteries at the same time you do your yearly HVAC maintenance. However, your thermostat will alert you at some point when its batteries are starting to run low. Depending on the model, this may be in the form of a light or a warning indicator on display itself. That can be your cue to start thinking about changing the batteries up, even though they may still have another month or two of power.
If the display on your programmable thermostat goes blank, this is a sign that your batteries have gone flat. That will render the thermostat inoperable, and you may be unable to use any previously programmed settings. At this point, changing out the batteries is a must for you to control your HVAC system again.
Replacing Thermostat Batteries
Beforehand, you will need a flathead screwdriver and fresh batteries. Unscrew the wall thermostat’s housing from its base plate and turn it over to locate the battery slots. You may find the batteries stuck in place and require extra force to remove them. Use your screwdriver to free them. Slide out the old batteries and replace them with new ones. Ensure that the plus sign is facing up (in cases where there are no markings). To re-attach the thermostat to the wall, match up and line up the pins at its rear with those of the terminal screw block. With a little pressure, it should snap into place securely.
Always install new batteries—not old, corroded ones to ensure your thermostat runs at peak efficiency. If your heating and cooling system still is not responding, it is best that you get in touch with a licensed HVAC repair professional. They can help answer any questions or concerns you have about the system.
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