Robert, Between the double terminals on the contactor I have 24vac. From the right double terminal to ground I have 0vac. From the left double terminal to ground I have 24vac. And yes the contactor bar pulled in. Nothing is running on the heat pump. Only the inside the house blower fan is running. S...

Robert,

Since I had that new contactor here, I installed that tonight. I then checked what you asked.

I have 24vac from post T1 to ground and also from T1 to T0.

And the middle of the contactor is pulling in.

Anything else I need to check?

Thanks,
Greg

Thanks for the info Robert. I haven't checked anything out yet as it was 11 pm when I noticed this. Could you explain how I might check what you mentioned?

I bought a new contactor from you too, but haven't installed it as the defrost board took care of the issue the first time.

Greg

Hi, I have a T3BA-030K heat pump and just noticed last night that it is not coming on after the electric furnace kicked on and it was 50 degrees out. I replaced the defrost board earlier this year as I was having the same issue at the beginning of the heating season. The new defrost board took care ...

Hi, new here, great site! My heat pump won't come on this heating season. It is a T3BA-030K. I can hear it wanting to come on by the clicking noise it makes at the contactor. I had our "trained" HVAC come out to trouble shoot if for me and he "thinks" it is the Defrost Control Bo...