Does it burn continuously when the vent is disconnected and all stats wired? Do not do this test for more than a few seconds. You must block thedoor opening to have flame pulled through.
did not try it with the vent disconnected. i had the door on when i last ran the dryer. i can hear the burner ignight then go out.
Also i don't know if this matters but on the display where is says processing the "cooling" light is always on along with the "drying" light.