GoodMan Furnace GMS80904BNA Flame Problem
Furnace flame ignites till blower starts and goes off in 10 seconds 15 seconds and will ignite again and will repeat all night long or until thermostat reaches temp.. System does not lock out.
No troubleshooting codes.
Started with a bad Pressure switch (no flame at that time) did receive codes for this replaced and got flame.
What I have done so far:
Replaced mother board twice.
Cleaned flame sensor.
Cleaned evaporator coils.
Had 2 technicians who apparently have no clue.
Any help would be appreciated.