Carrier PTACSTAT-NP-HP, PTACSTAT-NP-HC specification

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.