Take out the dead, old batteries.

Changing batteries in honeywell thermostat. Wait five minutes after removing. Changing batteries of honeywell thermostat. Remove the bad battery from the thermostat by unscrewing all the screws holding it.

Return the cover plate to the wall plate. Some honeywell thermostats use an aa battery or aa alkaline batteries, while others use aaa batteries. Dispose of them properly and then insert your new batteries.

Turn off your thermostat, open the battery compartment on the front, and remove the batteries. Put your fingers at the bottom of the thermostat. Remove the old batteries, noting where the positive and negative ends are placed.

Pushing down the tab on the top opens the battery compartment. Then, use a phillips screwdriver to remove the two screws that secure the cover in place. Thermostats can be tricky, and this guide aims to make the task of changing a thermostat battery a bit easier.

Honeywell thermostat 5000 series and 6000 series. Put the new batteries in the compartment and slide the protective plate over them. Once you have taken off the cover it is.

Now pull the cover with your fingers to take the cover off. If so, your thermostat may go into setup mode that can result in blinking cool on indicator. First, locate the battery cover on the back of the thermostat.