I have a york heat pump model #E1F024506B. I changed the thermostat on it a month ago. the a/c was working fine but when it started getting cold my heat wasn't working so I put the old thermostat back on it then only the air handler was working. I checked the voltage at my pumps contactor and I was getting 26 volts to ground but 0 across the coil so I checked my board in my air handler and someone put a 30 amp fuse where a 5 amp suppose to be. I took off the board and found a burnt spot on it. I soldered the bad spot and put 5 amp fuse back in it now my air blower and aux heat is working but not my heat pump. Any ideas what could be wrong.

Thank you,
Jason

 

Does the A/C work?

When you said you got the fan and Aux heat to work, is this with the old or new t-stat?

Check your Y wire hook up on the board to see if you are getting power from the t-stat, and there should be another wire from the outdoor unit meeting on the board's Y.

 

the a/c is not working either and it is my old thermostat and I'm getting 26 volts to Y.

 

Quote "I checked the voltage at my pumps contactor and I was getting 26 volts to ground but 0 across the coil"

It sounds like you are getting 24 volts control voltage at the contactor, so IS the Contactor pulling IN?

 

I was before I fixed that burnt spot but it looked like I wasn't getting my common. I even tried to hook up another contactor
and it still wasn't closing. After I fixed the burnt spot I'm reading nothing to ground or across the coil.

 

The burnt spot I fixed on the board was for the common.

 

sounds like we may have a board failure if it is not sending the 24 volts out, the soldering iron may have damaged one of the little diodes or something. I guess you will have to put a new board on dont you think?

 

Yeah thats what I figured but I wanted another opinion.
Thank you for response,
Jason