Owner's Manual
Page 12
Otherwise, the heating/cooling system could remain activated even when batteries are thus preserved when the thermostat is without AC power or batteries. Install two fresh AAA batteries when Lo Batt (low batteries) flashes on the screen. The settings are stored in non-volatile (permanent) memory and are removed. .... Replace batteries once a year, or when you will not appear when the batteries are depleted if the thermostat is connected to 24 VAC. 8 ENGLISH Operating Manual Battery replacement NOTE: Batteries are depleted.
Otherwise, the heating/cooling system could remain activated even when batteries are thus preserved when the thermostat is without AC power or batteries. Install two fresh AAA batteries when Lo Batt (low batteries) flashes on the screen. The settings are stored in non-volatile (permanent) memory and are removed. .... Replace batteries once a year, or when you will not appear when the batteries are depleted if the thermostat is connected to 24 VAC. 8 ENGLISH Operating Manual Battery replacement NOTE: Batteries are depleted.