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    Mr Heater Big Maxx 3rd burner won't light

    I have a new 50000 BTU Big Maxx installed in my shop. The igniter lights the 1st burner fine and the flame quickly spreads to the 2nd burner but won't spread to the 3rd and the flame sensor shuts it down. If I just blow on the 2nd burner the flame will jump up and the unit runs fine until it...
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