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Have a Bryant model 394ga1024075 when I call for heat the pilot comes on but when the gas valve comes on it lites for a second then gos out. Ive replaced control board , spark igniter gas valve and pi

Have a Bryant model 394ga1024075 when I call for heat the pilot comes on but when the gas valve comes on it lites for a second then gos out. Ive replaced control board , spark igniter gas valve and pilot assm. still same problem. there are no roll out switches on this unit

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  • 166 Answers

Check the gas pressure and/or gas line to see if it's it plugged
Q. does it pop when it goes out???

Posted on Nov 14, 2014

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Posted on Jan 02, 2017

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SOURCE: goodman ac/gas furnace unit mdl. # gmp075-4

i HAD THE SAME PROBLEM, TURNS OUT IT WAS THE FLAME SENSOR, CLEANED IT, AND ALL WAS GOOD

Posted on Dec 13, 2007

Therinnaiguy
  • 1420 Answers

SOURCE: Goodman GMP075-3 ignition problem

OK, if the furnace is not lighting for even a few seconds, you have either a bad gas valve, bad wire, bad control module or no gas. The pressure switch is not the issue. Check all wires to the gas valve and look for 24 volts across them when the ignitor glows and you hear the click. Then test for 24 volts to ground. It could be a bad ground wire.

Posted on Oct 21, 2008

  • 6 Answers

SOURCE: Goodman GMP075-3 ignition problem

bad board,i have had several board failures on goodman

Posted on Dec 31, 2008

SOURCE: Ducted heating unit blows cold air and fan is always on..

that s correct the control is done by the thermostat stop the heating up to your set point and restart if the medium temp is under the set point
if this sequence fail means
- no power to the control element or is defective
thanks

Posted on Apr 27, 2009

  • 1 Answer

SOURCE: Goodman GMP075-3 ignition problem

Goodman gmp075-3 gas furnace and the flame cycles for 4 sec

Posted on Dec 11, 2009

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Hello
Sounds like the thermocouple is going bad.The thermocouple is a thin tube that runs from the pilot lite to the gas valve.
What it does is it sences the heat from the pilot lite and keeps the gas valve open to allow the pilot to stay on.
This can be easily repaird by shutting off power and gas to your heater and removeing the thermocouple from the gas valve,then unclip or unscrew it from the pilot lite area.
Any plumbing supply store or home depot or lowes should have these.

Once you get a new one,install to gas valve and pilot lite area then turn on power and gas to heater and follow pilot lighting procedure,you may need to hold gas on for 60 seconds.

Here is a picture of the thermocouple so you know what to look for.


http://thermocatalytic.com/Thermocouple.JPG
http://homerepairgeek.com/wp-content/uploads/2010/12/furnace-thermocouple.jpg

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Heats fine when gets up to temp gos down to pilet will not lite back up tell i tap the valve


you could have a dirty pilot. these run on 750 mv. it takes around 200 to run the main burner. check to see if the pilot is sharp and blue or lazy and yellow. loose or dirty connection on the wiring will also cauce this problem.

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