An furnace or heater igniter is an electronic device that lights the burner in a gas furnace. Many newer furnaces use electrical igniters instead of pilot light systems, and replacements allows users with broken parts to get their systems running again.
Electrical igniters are generally fairly easy to test, so owners who think their furnaces are malfunctioning may want to first test their igniters
Before troubleshooting an electrical igniter, owners should be sure to disconnect the power to the system. After opening the door to the ignition area, owners should look for a reset button, which might pop up if the system is faulty. After pressing the button or setting the system to off for a few minutes, owners can restore the power and test the furnace to see if it's able to produce heat.