Owner's Manual
Page 11
... 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. Install fresh batteries when the REPLACE BATT warning begins flashing. Replace batteries once a year, or before the batteries ... ENGLISH M29422 PRO TH3110D / TH3210D M29421 Batteries are optional (for more than a month. Battery replacement Pull at bottom to the display during power interruptions. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall...
... 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. Install fresh batteries when the REPLACE BATT warning begins flashing. Replace batteries once a year, or before the batteries ... ENGLISH M29422 PRO TH3110D / TH3210D M29421 Batteries are optional (for more than a month. Battery replacement Pull at bottom to the display during power interruptions. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall...