Honeywell T8131A Owner's Manual - Page 9

Install Batteries IMPORTANT Batteries must be installed for programming and operating the thermostat and heating/cooling system. ³ Use two AA alkaline batteries; nonalkaline batteries will not last as long, and can leak, causing damage to the thermostat or the wall surface. We recommend Energizer® batteries. ᕢ Make sure the thermostat is set to the OFF position. ᕣ Use a coin to remove the battery door. ᕤ Install the fresh batteries as shown, making sure positive and negative terminals are oriented correctly. ᕥ Replace the battery door. REMOVING BATTERY DOOR M1719C As the batteries are running low, a bAt Lo indicator flashes for one to two months before the batteries run out completely. Replace the batteries as soon as possible after the indicator starts flashing. If you do not replace the batteries sometime during the flashing bAt Lo, the 9 69-0887-1