Question about Goodman GMS90703BXA Heater

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AIR or Heat wont come on/ goodman GMP075-3

MY Goodman GMP075-3 unit will not come on. The Status light is red, I checked the fuse, and replaced the Termostat. nothing worked.

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  • rhglass59 Jun 27, 2008

    I have the same model. I disconnected the thermostat so the unit would run independently and the ignitor ignites and the fan blower comes on. I checked for frayed wires in the low voltage but didn't see any. I think checked the transformer to be good. Other than safety low voltage relays, door switches and thermal overloads, the only solution has to be the circuit board. The red light stays on constantly. I didn't see that in the code sheet. I would assume a solid 'green' light would indicate the board to be working correctly. Now who sells the boards where I won't be robbed.??



    Thanks.

  • deniseiscold Nov 17, 2008

    Does anyone know what type of circuit board to buy?

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If there is no blinking light, then the unit is not seeing a call for heat or cool. My guess is a lose or broken wire in the thermostat circuit. Try and putting a jumper across the red and white heat terminals inside the furnace and manually closing the door switch. If you get heat, it's telling you there is a wiring issue. If you get nothing, it's a bad circuit board.

Posted on Jun 10, 2008

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