A thermostat can sometimes continue to work with low batteries, but it's not recommended to rely on it in that state. When the batteries are low, the thermostat may not be able to accurately measure the temperature or communicate with the heating or cooling system. This can result in incorrect temperature readings, the system not turning on or off properly, or other malfunctions.
To avoid any issues, it's best to replace the batteries in your thermostat when they start to run low. Most thermostats will have a low battery indicator or warning that lets you know when it's time to replace the batteries. It's a good idea to keep spare batteries on hand so you can replace them right away if needed.
If you do experience any issues with your thermostat, such as it not turning on or off properly or showing incorrect temperatures, check the batteries first to see if they need to be replaced. If replacing the batteries doesn't solve the issue, it's best to contact a licensed HVAC technician to diagnose and repair the problem.
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