I attempted to replace an old York programmable thermostat with a Hunter thermostat. After installing the Hunter thermostat, my unit will now not come on. I checked the circuit breaker and it is on. What else do I need to check? Please tell me that I didn't blow my unit. Any help or suggestions would be greatly appreciated. THANKS!

It would help to know what the thermostat operates, is it a furnace, an airconditioner or both. Is it a heat pump and if so it is all electric or does it have an alternative fuel.

It operates both the AC and heat. It is electric.

You have probably miswired the new thermostat. Double check the wiring diagram. I had a similar problem when installing a new Honeywell thermostat on a heat pump. Labman, the thermostat guru of this site, led me to find that I had fried the 24 volt transformer in the HP through my mistakes. A new transformer cost me about $11. Check to see if you are getting 24 volts from the red wire from the HP. Good luck.

THANK YOU!! That is a relief!! I will check the transformer and red wire.