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Once the Safe Start Check operation passes, the control turns on the spark circuit and at the same time, the S8701/S8702 opens the gas control’s main valves, which allows gas to flow to the main burner. Power is supplied to the generator until: • The main burner(s) lights and the flame sensor current reaches 1.0 m A, or • The ignition activation period ends If the main burner lights, a flame sensing circuit is completed through the flame to the burner head to ground. This current flow sets the T