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Old 05-02-2013, 09:57 PM   #1
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Goodman Ac Heating SOS wiring thermostat & ac dibacco


I have a GMH950703BXAF Goodman I bought a Honeywell RTH8500WF Thermostat installed and someone messed up namely (ME) one of the wires. thought they would just take apart with no reference.

The fuse on the main board was BLOW. replace that and have a heartbeat! But I have the red 3 code flashing.. lights Pressure switch stuck closed.
it turns it on all you hear is the blower is just spinning. no control at t-stat.
is there a manual reset for the presser switch?

Need help with wiring??

I have 2 little wires that go the the ac unit outside.
I think they connect to Y and C on the main board?

https://docs.google.com/file/d/0B8Jr...hNM2N2MHM/edit

Ac Out side unit

https://docs.google.com/file/d/0B8Jr...dCeFYtNTA/edit

to the main board inside wiring

https://docs.google.com/file/d/0B8Jr...l1SGhsQlk/edit

and here is the thermostat wiring

https://docs.google.com/file/d/0B8Jr...R3b0d4LUE/edit


You can see there us a 3wire red green white
(red)Y
(green) G
(white) W
and 2 wires
(Red) R
(White) C

Now there is a pump on the side of the unit

https://docs.google.com/file/d/0B8Jr...ZTeDFISGc/edit

A pump of water needs 24 volts looks like it turns on when water needs to be pumped?

thanks it all that even look.. and laugh at me.

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Old 05-02-2013, 10:32 PM   #2
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Goodman Ac Heating SOS wiring thermostat & ac dibacco


Furnace- Stat

R-R (24 volts)
G-G (fan)
W-W (heat) (I'm betting you took the heat wire outside to the condenser the first time, blew the fuse. or hooked the condenser white wire to the W terminal)
Y-Y (cooling)
and if there's a C than that's common to power a digital stat so C to shining C
now you have one SEPARATE y wire going out to the condenser and one common , the two wires you previously spoke of. those two bring on the condenser during call for cool, from furnace. Stat is merely a switch which tells the furnace what to do, like a light switch telling the light to come on. Just makes and breaks a circuit.

sorry, I didn't read with authenticity, nor looked at your links. I'm tired. hope I helped, though.

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Last edited by Doc Holliday; 05-02-2013 at 10:39 PM.
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Old 05-02-2013, 10:48 PM   #3
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Goodman Ac Heating SOS wiring thermostat & ac dibacco


what you need to do is jump the r to the W on the furnace board itself and see if she lights up or still gives you a code. you should unhook all stat wires first. if the furnace lights up with jumping the control board to bring on heat without giving you a pressure switch stuck closed ordeal then we can rule out the pressure switch to begin with and soley focus on your wiring.

make sure and turn off all power first, don't want to blow another fuse or get shocked.

let us know.
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