Honeywell T8131B Owner's Manual - Page 10
and heating/cooling system
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indicator eventually stops flashing. bAt Lo stays IMPORTANT on without flashing to indicate the thermostat and Although the thermostat has a low heating/cooling system have stopped working battery indicator, replace the batteries and the batteries are almost completely dead. once a year to prevent the thermostat and heating/cooling system from After the batteries are completely dead, the bAt shutting down due to lack of battery Lo indicator disappears, leaving a completely power. blank display. As a precaution, when Press down on the left ends of batteries to remove them. If you insert the new batteries within 20 to 30 seconds of removing the old ones, you do not need to reprogram the thermostat. However, if the display is blank, INSTALL TWO AA ALKALINE BATTERIES AS SHOWN leaving home for longer than a month, change the batteries before you leave to prevent the system from shutting down due to lack of battery power. the batteries are dead or incorrectly installed and you need to reprogram. See pages 16 to 19 to reprogram. M1713 10 69-0887-1