What does a bad furnace ignitor look like? Check yours.
It's freezing outside, you've cranked the thermostat, but all you hear is a faint clicking sound and the rush of cold air from the vents. If you've opened up your heater's cabinet and are wondering what does a bad furnace ignitor look like, you're likely staring at a small, gray or black component that isn't doing its job. Usually, a failed ignitor shows its age through visible cracks, dark "burn" spots, or a chalky white residue, but sometimes the damage is so subtle you need a flashlight and a close eye to spot it. ...