Remove the old batteries and replace them with new ones.

How to open honeywell thermostat to change battery. Remove the wall plate from the device. If the battery compartment is covered, remove it then take out the batteries. Swing it out from the face plate to reveal the batteries.

How to change honeywell thermostat battery step 1: Locate the batteries by removing the battery compartment tray or cover or by removing. How to fix a honeywell thermostat that isn’t working disconnect all of the cables from the thermostat.

Depress the tab to open the battery compartment. How to change battery in honeywell thermostat cool on but not working ac. Put the thermostat in the ‘off’ position and remove the batteries.

Remove the older 3 batteries and replace them with 3 new aaa batteries. Turn it over to access the battery compartment. Replace batt air conditioner if central air thermostat not working.

You will probably find two of them there. Locate the position of the battery for changing. Wait five minutes after removing.

Replace them with new ones. Turn it over and replace the aaa batteries. Here is how to replace the battery in honeywell 5000 series thermostat.