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c. Watch the ignition sequence at the burner. If the spark still does not stop after the pilot lights, replace the ignition module. If the main burner does not light, check for 24V AC across MV-MV/PV terminals. If there is no voltage, replace the module. Also, check the electrical connections between the module and the gas control. If they are okay, replace the gas control or the gas control operator. Appearance Cause small blue flame lack of gas due to clogged orifice filter lack of gas due to