Honeywell T8001 Owner's Manual - Page 14
Back Lighting Select Models, Replacing the Batteries, T8002 Models Only - thermostat blank display
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Back Lighting (Select Models) Any key pressed lights the display for approximately ten seconds. Replacing the Batteries (T8002 Models Only) The T8002 Thermostat requires three AA alkaline batteries to operate. As the batteries run low, your thermostat shows a "bAt Lo" message in the digital display. The message flashes for one to two months before the batteries run out completely. Replace the batteries as soon as possible after the message flashes. The batteries are located on the right side of the thermostat. Open the battery door from the bottom, lifting out. If you insert the batteries within approximately 30 seconds of removing the old batteries, the thermosat retains the current time and day. If the display is blank when changing batteries, reset the time and day. Your program does not require resetting; it is stored permanently! Important: Even if you do not see the "bAt Lo" message, replace the batteries once a year to prevent leakage and/or the heating/cooling system from shutting down due to lack of battey power. 14 69-1431-1