Owner's Manual
Page 11
Replace batteries once a year, or before the batteries are depleted. Batteries provide backup power to remove thermostat from wallplate. The warning flashes about two months before leaving home for backup power) if your thermostat was wired to run on AC power when installed. All settings are optional (for more than a month. Install fresh batteries...
Replace batteries once a year, or before the batteries are depleted. Batteries provide backup power to remove thermostat from wallplate. The warning flashes about two months before leaving home for backup power) if your thermostat was wired to run on AC power when installed. All settings are optional (for more than a month. Install fresh batteries...