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View Full Version : A.O.Smith FPS 50 hot water heater burner won't light


Jeep1
Feb 2, 2010, 06:54 PM
The pilot light is lit but the burner won't light. The vent blower is running, the vent flapper valve is free to move and in the open position. If I tap the flapper valve shut for an instant, the burner lights. What position should the flapper valve be in when the burner is running?