I don't know it is very old, not digital . It has clear plastic tabs to slide a/c on top right and heat on left. The bottom has a slide that says off,on,sup.heat which makes a red light come on. On the bottom of the other side it has on, auto,,offI don't know it is very old, not digital . It has clear plastic tabs to slide a/c on top right and heat on left. The bottom has a slide that says off,on,sup.heat which makes a red light come on. On the bottom of the other side it has on, auto,,off
That is the switch to bring on your emergency/ supplemental heat when the heat pump is unable to heat the home. It needs to be off while in a.c.That is the switch to bring on your emergency/ supplemental heat when the heat pump is unable to heat the home. It needs to be off while in a.c.
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Which carrier thermostat?
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I don't know it is very old, not digital . It has clear plastic tabs to slide a/c on top right and heat on left. The bottom has a slide that says off,on,sup.heat which makes a red light come on. On the bottom of the other side it has on, auto,,off
That is the switch to bring on your emergency/ supplemental heat when the heat pump is unable to heat the home. It needs to be off while in a.c.