My 15-yr old thermostat has weird programming quirks that I got tired of so I bought a new one and installed it. I made sure to follow the instructions to the letter and am quite sure that the wiring was correct.

However, when I turned the breakers in my main house breaker panel back on neither the heat or air conditioning work, only room temperature air comes out of the furnace. There's a heat pump outside which doesn't turn on either (it used to turn on for a/c).

I think it's a breaker problem because I put the old thermostat back in and still have the same problem. I can provide model numbers of everything if need be. Obviously I'm new to HVAC type stuff.

--opm8

Often there is a fuse/breaker near the outside unit. Did you check to see if they were still good.

Yes, there is a breaker which I turned off and on again and it didn't change anything. Also, one of the pipes from the heat pump outside is cold and the fan blades spin freely if I move them by hand. I switched the house breakers that control the heat pump and furnace off and on, too.

Help!

I don't understand how one of the pipes to you condensing unit is cold if it is not running. Is anything outside running. One other thing, heat pumps go through a defrost stage and sometime they even quit working.

OK, so once more resetting all my breakers the heat pump has mysteriously started working and I have A/C again. I'm going to test if heat works and then I will be swapping out the old thermostat for the new one.

I'll post an update when that's done, and in the meantime thanks for your help jasv and letmetellu.

--opm8

I reinstalled the new thermostat and all seems to work. Thanks for everyone's help.

--opm8

This post is over 3 years old

And it still looks as good as the day it was new... ;)

I'm here too :) Thermostat still working fine. Heat pump needed a new capacitor during this summer's heat wave, though.

Could be worse... imagine being told your capacitor needs a new heat pump... :confused:

That sounds expensive. LOL