york 80 furnace mod. # p4hua12n06401a ser. # wemm01044

[repairguy42]

igniter comes on, gas ignites and goes out in 6 seconds.  red light on board comes on and goes out.   then that cycle reapeats. need help. thanks

[jumptrout51]

Make sure all burners are lit for the short duration.
Pay special attention to the burner at the flame sensor.
Clean the flame sensor probe.
A dirty sensor probe can cause this issue.
It may not look dirty.
A few swipes with fine sandpaper should do it.