Owner's Manual
Page 19
... if the warning does not appear, you should replace batteries once a year, or before the batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. MCR29467 Batteries are depleted. Install fresh batteries immediately when the REPLACE BATTERY warning begins flashing. If batteries are...
... if the warning does not appear, you should replace batteries once a year, or before the batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. MCR29467 Batteries are depleted. Install fresh batteries immediately when the REPLACE BATTERY warning begins flashing. If batteries are...