Speed Queen AGS28AWF Flame will not stay on for longer than 5 second. Will fire up than shut off. Have replaced Flame Sensor, Thermostat (All) igniter the coils and gas housing to the unit and today the timer. But all that happens is the Flame will go on for about 5 seconds and turn off. Vents are clear as well. Not sure what else it can be.
have discovered by blowing air into the flame assembly will make it stay on for longer