Your furnace is a controlled fire burning in your home to keep you warm all winter long. Of course, when everything is working right, it won’t do damage to your house. That’s because of special safety controls installed in your furnace! If something requires that many safety controls, you can imagine there’s a lot that could go wrong.
Fire, dangerous gases like carbon monoxide, and other hazards are all kept at bay when your safety controls are working properly. But how do you know they’re working?