On a programmable Honeywell thermostat, lift the thermostat cover outward from the bottom.

Honeywell makes a large number of different thermostats, and if you want to replace the Honeywell thermostat battery, the procedure depends on the model. The T6 Pro Smart Thermostat can give you home comfort control from anywhere. Replace the old Honeywell thermostat battery or batteries with fresh alkaline AA batteries. It's always easy to do, involving little more than pulling the cover plate off the wall or opening a battery compartment on the side of the unit. Product Description. You can take the cover off a Honeywell T6 Thermostat by pushing up on the device and pulling it off its UWP mounting system. 7 Press Back to go back a step to enter the correct number and press Select. Adaptive Intelligent Recovery Over time, the Honeywell T6 Pro Thermostat “learns” how long it takes your system to reach the temperature you want. This will let you access the batteries and any wiring for the device. It turns on the heating or cooling system earlier to make sure you’re comfortable at the time you expect. Connect to the app to view and change temperature settings, program a 7-day schedule or just let the T6 respond automatically — it's designed to work with the heating stages of your existing system. You can then snap the T6 Thermostat back onto the mounting system so that it resumes operation. Control Your Comfort.

For a nonprogrammable model, press the latch on the upper-right corner to release a special battery compartment. T6 Pro Your New Non-Connected Workhorse.