When a load is started the flames kick on but less than a minute later the flame goes out and ther is no heat produced. I have check and cleaned out the vent and blower. I have also blown out all of the dust and lint from the burner assy and motor. all the belt appear to show no sign of wear. all of this has seem to help alittle but loads use to dry in 1 hour and now it takes about three hour to dry. What can I do to resolve this issue that I have not done yet?

Thanks, Tim