How to Change Batteries on Honeywell Thermostat RTH2300 RTH221. Honeywell Thermostat 5.2 Models RTH2300B and RTH221B can be a challenge to open, to access the batteries. ( My thermostat is UPC Code 085267406123. These models of Honeywell thermostats use two AAA alkaline batteries. ) In this video, the thermostat has already been mounted to the wall. So, the process is somewhat different from opening this thermostat, if it has yet to be installed. To see how I opened the brand new thermostat, you could click the following link: https://www.youtube.com/watch?v=j2WR9ibhdqo
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