While I was replacing old Honeywell 7day programmable thermostat with new Ritetemp touch-screen programmable thermostat, something went wrong and now I have no fan nor heat. The phone support at ritetemp suggested that I must have blown fuse of the transformer.

I have 12yrs old York Heatpump model 2HM06501306D. Inside the unit of the indoor unit looks simple and wonder if I can replace it easily.

Any suggestions will be greatly appreciated.