Carrier PTACSTAT-NP-HP - Manual (Page 22)

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Two AA batteries should last about one year. When the batteries have lost about
one--third of their power, a battery icon appears on the display (two--thirds of it
will be black). As the batteries get weaker, the icon goes down to one black bar
and then none. When the icon is empty, you will begin to lose thermostat
functions. We recommend that you replace the batteries at the one bar level with
two AA alkaline batteries.
They are located in the back of the thermostat, so you’ll have to remove it from
the wall. Here’s how to replace batteries:
1. Locate the latch at the top of the thermostat. It’s at the center of the top
rim.
2. Press it down. This will disconnect the thermostat from the top of the wall
plate.
3. Remove the thermostat from the wall bracket completely by bringing it
slightly toward you and lifting it up and off the lip on the lower edge of
the wall bracket.
4. You will see the batteries in the lower right corner. Replace the batteries
with two AA alkaline batteries.
5. Put the thermostat back on the wall bracket by lining up the slot on the
bottom edge of the back of the thermostat with the lip on the wall bracket.
You will feel the slot fit over the lip.
6. With the bottom of the thermostat attached to the bottom of the wall
bracket, bring the thermostat back to the wall. Line up the latch at the top
of the thermostat with the corresponding lip on the wall bracket.
7. Lightly push the thermostat toward the wall. When the latch and lip are
lined up properly, you will hear the thermostat snap into place.