You need to remove the thermostat from the wall plate to change the battery. Look on the bottom of the thermostat for a locking screw. Loosen this screw with an appropriate screw driver. Then pull the bottom of the thermostat away from the wall plate and then lift up from the bottom. When you put the thermostat back on, line up the brackets at the top of the thermostat with the slots on the wall plate. Then push the thermostat against the wall plate and tighten the locking screw.
The documentation for the Honeywell RTH2300B1012/U is available on the product page: https://www.honeywellstore.com/store/products/5-2-day-programmable-thermostat-honeywell-rth2300b.htm . Click on the Manuals tab. See page 4 (page 6 of the PDF) for removing the thermostat from the wall plate. See page 9 (11 of the PDF) for replacing the batteries and putting the thermostat back on the wall plate. The current link to the manual is https://www.honeywellstore.com/store/images/pdf/rth2300b1012-u-5-2-day-programmable-thermostat.pdf .
I hope this helps.
Cindy Wells
SOURCE: I changed the batteries of
Hello my name is Heath it will be my pleasure to assist you. Take the new batteries out and let the display go completely blank then reinstall the new batteries and the lo batt light should go off.
SOURCE: How do I change the battery on Honeywell Thermostat T8001C?
According to the manual for the model series (see link), only the T8002 Model has batteries. They are accessed from the right side of the thermostat. See page 14.
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1431.pdf
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