Troubleshooting A Defective Electronic Ignition
One of the ways that a furnace will ignite itself is with electronic ignition. This is a common point at which a gas furnace fails and can leave you without heat. Of course, you should check to see if the gas heading to your gas furnace has been disrupted, but you should also look into your electronic ignition.
How Electronic Ignition Works
While older gas furnaces use a pilot light, some newer gas furnaces use electronic ignition.