Exactly what does a thermocouple do in a furnace anyway?
If you've ever found yourself shivering in a cold house on a winter morning, staring at your heating system, you might have wondered what does a thermocouple do in a furnace and why such a tiny piece of metal matters so much. It's one of those components that stays tucked away out of sight, but if it decides to quit, your whole heating system effectively goes on strike. ...