Gas Furnace Issues

[mshell56118]

I have a Goodman GMS950904cxa furnace
The inducer come on & off several times then ignitor starts flame starts
blower comes on run 30 sec flame shuts off blower continues to run then 30sec-1min the ignitor comes back on flame starts and usually will stay on for the heating cycle but if not same thing flame out blower continues the restarts ignitor

I have replaced a air pressure switch and the flame sensor
Any ideas???

 

[brihvac]

Take your stat off the wall and jump R & W and see what happens.

 

[mshell56118]

same thing still

 

[goneflyin2002]

check to see if the 24VAC is staying on at the gas valve terminals.
my house furnace just crapped out middle of the night last night- 24VAC was there at the gas valve, but the solenoid in the valve was intermittently open circuit.

 

[zmaxmotorsports]

What code is it giving you?

 

[mshell56118]

that is the issue no code at all
if you are watching it it is like the gas is shut off
but then t will retry

very confused

 

[bazar01]

that is the issue no code at all
if you are watching it it is like the gas is shut off
but then t will retry

very confused

That unit has integrated furnace control and diagnostics.
It should give a flashing led code on the control board inside the unit.

Anyway, it looks like it tripping on something (high temp limit maybe or something), then it resets and tries to relight and so on and so forth.
Check the nameplate for the temp rise and compare to actual readings using a thermometer on the inlet and outlet).
How old is the unit?

 

[mshell56118]

5 -6yrs old
I have watched the led when it drops out and it never changes state stays solid lit
I will check temp rise tonight or tomorrow when time allows


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[mshell56118]

The new air pressure switch was defective


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