Question about Goodman GMS90703BXA Heater

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Goodman Furnace GMP 050-03

I have goodman Furnance Model GMP 050-03 the until was working fine until just the other day. Problem The Unit is Turned on And The First Fan comes on the one with the black Vacume tube The Electonic ignigator comes ons on Gets read hot and redy to fire the gas. (But) no Gas is released. The unit Then Shut the Ingianor offf and the Unti Repeates it Self for Three Times same thing then shuts Down. Every Thing Seem to work prestage to the Gas Release and firing the Heater up I have also Been told there is a Senaor Light Ect that Blinks a Code where is it? Apperciate the Help Limited Budget Like the Reast of ALl of us and Two Disabled people in the House any Correct help would Be apperciated

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  • dwkcool May 11, 2010

    look in the lower part of the unit the control board is in there and the light is on there that flashes

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You need to check for 24 volts across the gas valve as the ignitor glows. If you get it, it is a bad gas valve. If there is no voltage or strange voltage, replace the control board.

Posted on Dec 10, 2008

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Mine was a composite problem.
Problem #1 - the ignitor, which to the best of my knowledge was 12 years old, didn't ignite anymore (wouldn't get hot).
I replaced that and then had this problem.
I checked the voltage and after a few tries I saw the voltage go up to about 25V for about half a second.
I ended up disconnecting the gas valve terminals and reconnecting a few times, and that seems to have made the trick - bad contacts after 12 years of service.
All in all I paid $60 for the igniter (the new nitride kind) from a local repair person (paid a little extra and avoided waiting for it to be shipped).
I definitely learned a little bit about these things!

Posted on Jan 19, 2009

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I had a similar problem and it turned out to be the flame sensor. if you look in the furnace, there are two burn tubes - one has the ignitor and the other will have the flame sensor - it looks like a little rod with a wire coming out of the top end. i readjusted the position of the sensor and turned the air/fuel mixture on the burn tube to burn more fuel than air. it seemed to solve the problem.

Posted on Jan 08, 2009

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Posted on Jan 02, 2017

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