Check that you’re using the.

Thermostat not working after battery change. Check the power to the thermostat when your. Remove the wall plate from the device. There are three significant reasons your thermostat isn’t working even after changing the batteries.

Changed batteries on thermostat now central ac will not work thermostat (simple honeywell, not wifi/smart) was alerting to low battery, so i pulled it off the wall (didn't think to. Next he asked me to check the ac condensation overflow pipe to make sure that there wasn't a clog because if there is a clog the safety valve will cut off power to the thermostat. Hold the “reset” button on your thermostat for 5 seconds if it’s not working after a power outage.

Learn what they are and what to do here. It’s likely due to needing a battery replacement, but there are other possible causes. You replaced the old batteries with the wrong batteries;

How to fix a honeywell thermostat that isn’t working disconnect all of the cables from the thermostat. If this doesn’t work, turn off your thermostat and inspect the batteries; Ask your own hvac question.

Here is how to perform a honeywell thermostat reset: Ensure you’re using the required batteries; As a last resort, you may want to.

Power cycle your thermostat 3. Remove and reinsert the batteries 2. Try these troubleshooting tips 1.