[Greg21159]

I was changing out a thermostat on a heat pump and shut off power. After I put power back on, I needed to switch 2 of the wires and forgot to turn power off. I think I may have messed up the circuit board or something because it won't come back on. What are my options?

 

[yuri]

Look for a 3-5 amp GM type auto fuse on the circuit board or its vicinity.

 

[bristol 123]

Fuse is correct

 

[biggles]

what subbase letters did you have to flip the 2 wires between?