Goodman gmh80603an gas valve shut off. First turns on, igniter comes on burner light then after 5 seconds goes out then runs through the cycle again but lights for only a second or two. Cleaned flame sensor still the same problem. Installed new flame sensor same problem, unit is a year old.

Sounds like it might be the roll out switch. Do you have a voltmeter?

Yes I got a voltmeter I'll look through the manual and see if I can find the roll out switch and check it.

Checked all the roll switches, they are good. Check other switches and did get the furnace to stay on for one heat cycle then it went right back to turning on the gas and shutting it back off without ever butting tue furnace in lock mode.

So you aren't getting any flash codes?

That is correct would make it a lot easier if I would get a code

Was just down looking over the furnace now I'm getting a pressure switch code. Checked continuity over switch while restarting furnace, got good constant continuity but going to get online and order a new one and go from there.

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Originally Posted by cesport

Was just down looking over the furnace now I'm getting a pressure switch code. Checked continuity over switch while restarting furnace, got good constant continuity but going to get online and order a new one and go from there.

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The best way to check the pressure switch would be to put one lead of the voltmeter on C of the control module and the other lead on the pressure switch. If you have 24V on both sides of the switch then it's closed and working properly. If you have 0V on one side the switch it's open. If it's open then make sure the inducer motor is running.

Put the new pressure switch in still had the same problem. Decided to pull out the inducer motor and found 2 birds stuck around the fan. Reducing my vacuum. Thanks for your help