Owner's Manual
Page 18
... replacement Pull at bottom to run on AC power when installed. The warning flashes about two months before leaving home for backup power) if your thermostat was wired to remove thermostat from wallplate. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall thermostat. 69-1760EFS-01 MCR29478 16 Batteries are depleted.
... replacement Pull at bottom to run on AC power when installed. The warning flashes about two months before leaving home for backup power) if your thermostat was wired to remove thermostat from wallplate. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall thermostat. 69-1760EFS-01 MCR29478 16 Batteries are depleted.