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== Electronic Ignition ==The electronic ignition system in a gas furnace is a more efficient way to light the burners than the old pilot light system. The electronic ignition occurs typically in one of two ways, Intermittent Pilot, or Hot Surface Ignition. The intermittent pilot system uses an electronically controlled high voltage electrical spark to ignite the gas pilot and then subsequently the main burners when the thermostat calls for heat.The hot surface ignition system uses an electronically controlled resistance heating element, not unlike a light bulb filament (and shown in the photo above), to ignite the gas burner.