Goodman A/C compressor contacter won't close

[jet62]

Installed a new Goodman furnace (GMS81405DN), evaporator and condensing unit (GSC130481) last Fall for my Parents. Furnace worked great all Winter and now the air conditioner compressor contactor won’t close. I have 27 volts at the contactor and 18 ohms across the contactor coil. I have tried another contactor as well. I also jumpered a spare contactor at the furnace board Y and R and it still won’t close. I have 28 volts across Y and R also. Indoor fan runs like it is supposed to.

I am wondering if something on the furnace board is opening up when I put a load on Y? Has anyone had problems with these boards before?

Thanks in advance.

[jet62]

Well I don't have a common on this board. Also when the thermostat calls for cool the R and Y contacts close as they should. The compressor contacter is wired in series with the Y wire back to the board and like I said I have 27 volts at the contacter, it should close.

[dandyme]

don't let the magic smoke out!

[Gunnery Sergeant Hartman]

This thread is full of DIY advice!!!

[seanddd]

Hopefully OP sees these advise before blowing his transformer, to say the least.


This thread is full of DIY advice!!!

[seanddd]

OP at least owns a set of gauge, torch and vacuum pump/gauge, so he is a pro.


This thread is full of DIY advice!!!

[cehs]

I have stated that the OP needs a Pro.
He does not understand simple control wiring, and therefore needs a PRO...

[seanddd]

Jet62, I think you are very capable. Just take a picture of the install inside and outside, show the pros here that you do things just as well as they do.


Installed a new Goodman furnace (GMS81405DN), evaporator and condensing unit (GSC130481) last Fall for my Parents. Furnace worked great all Winter and now the air conditioner compressor contactor won’t close. I have 27 volts at the contactor and 18 ohms across the contactor coil. I have tried another contactor as well. I also jumpered a spare contactor at the furnace board Y and R and it still won’t close. I have 28 volts across Y and R also. Indoor fan runs like it is supposed to.

I am wondering if something on the furnace board is opening up when I put a load on Y? Has anyone had problems with these boards before?

Thanks in advance.

[cehs]

In another thread, you asked about the relay the power company put on some Apt units.
Is this one of them???

[seanddd]

Never seen a 120V contactor coil in residential equipment.


Ok iv read back a bit and haven't seen this question yet.. you sure you got a 24v coil? not a 120v coil

[ccut]

This thread is full of DIY advice!!!

I agree, where's bt?

[beenthere]

Jet, you want technical advise.
Apply for pro membership. And ask for help in the pro forums.