How to Check a Flame Sensor on a Furnace Yourself
You're probably here because your heat just kicked off, and you're trying to figure out how to check a flame sensor on a furnace before calling in an expensive repair tech. It's a classic winter frustration: you hear the furnace click, the inducer motor starts humming, you see the glow of the igniter, and for a glorious three seconds, you feel a puff of warm air. Then—click—everything goes cold again. It's enough to make anyone want to pull their hair out, especially when it's ten degrees outside and the house is cooling down fast. ...