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When the heater is working properly: • The emmitter screen is glowing bright orang-red. • There are no flames above the burner. • The flame is burning on the surface of the screen and not inside the burner (flashback). • There is no strong disagreeable odor, eye burning or other physical discomfort. • There is no smoke or soot internal or external to the heater. • There are no unplanned or unexplained shut downs of the heater. The parts lists and exploded view show the heater as it was construct