Radio Thermostat CT110 - Battery Replacement
Oct 09, 2025
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Radio Thermostat CT110 – Battery Replacement & Safety Guide
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Any questions regarding the installation, maintenance, and/or usage instructions in this guide should be directed to the device manufacturer.
To access the full installation guide, see Radio Thermostat CT110 - Installation Guide.
Battery Requirements
The Radio Thermostat CT110 requires four AA alkaline batteries.
Special Thermostat Battery Cautions
- Replace the batteries as soon as the low battery indicator appears.
- Always replace the batteries at least once a year to prevent leakage or corrosion damage.
- If leaving your home for a month or longer, replace the batteries as a precaution.
- Only use new, high-quality alkaline batteries.
- Failure to replace batteries can result in heating or cooling system failure and possible damage to your HVAC system.
- If the thermostat loses power, it will not control temperature, leading to risks such as frozen pipes or excessive heat.
How to Replace the Batteries
- Remove the back cover from the thermostat.
- Install four new AA batteries, ensuring correct polarity:
- Insert the negative end first (against the spring).
- Push the positive end into place.
- Reinstall the back cover securely.
- The CT110 will automatically power on in the OFF mode.
Note: Failing to replace batteries promptly can cause thermostat malfunction or complete power loss. Regular maintenance ensures consistent heating and cooling control.
