It is also essential that any gas furnace ignition system has a good ground.
Automatic ignition system furnace.
If you have a newer furnace or one with an afue rating above 80 it most likely has an electronic ignition system.
That means the 24 volts cannot float from one leg to the other.
Intermittent pilot ignition the intermittent pilot was the most common furnace ignition system in the second half of the 1900s.
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That ensures the 24 volts system is not a floating 24 volts.
The pilot in turn lights the gas for the burners.
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It used an automatic spark ignitor to light the main burners via a gas pilot light that was always on.
The furnace s electronic control board activates an electric igniter that uses a high voltage spark to light the pilot.
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The module needs good ground to the control board or control module.
One type of electronic ignition is an intermittent pilot.