Owner's Manual
Page 12
... require battery power. 10 Install fresh batteries immediately when the REPLACE BATTERY warning begins flashing. All settings are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. The warning flashes about two months before leaving home for more than a month. Operating Manual Battery replacement...
... require battery power. 10 Install fresh batteries immediately when the REPLACE BATTERY warning begins flashing. All settings are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. The warning flashes about two months before leaving home for more than a month. Operating Manual Battery replacement...