Owner's Manual
Page 11
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. All settings are depleted. M29422 PRO TH3110D / TH3210D ...
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. All settings are depleted. M29422 PRO TH3110D / TH3210D ...