Most Common Gas Furnace Problems

Posted By calgarypro | Posted On January 19, 2018 | Posted Under Furnace Repairs

Furnace Issues

I’d like your advice regarding the most common gas furnace problems, and what to do about them. Make sure you actually set the thermostat to heat instead of simply turning the temperature up before you assume the furnace is broken. I’ve heard jokes about that being one of the easiest service calls people get. If the unit starts up and then dies, the first thing I’d check is the air filters. Not the flame sensor? You can check to make sure the filter is not clogged while the furnace cools down. If the filter isn’t dark, then you can see if the flame sensor is.

It’s a piece of metal, usually with a ceramic base. Sure, and if it is covered in black soot, the furnace is dying because the sensor can’t tell that the flame is actually on. So I need to replace it. You can clean it with a brillo pad or emery board. I have sand paper. Sand paper removes a lot of the soot but leaves behind sand that is just as insulating. So that would be counter-productive. There is the chance the flame sensor is actually broken, assuming you didn’t break it. I’ve heard you need to have a spare pressure sensor around because that does break periodically. Yes, they tend to go out every three to four years. And if the pressure sensor is broken, the furnace won’t start. I know that Trane furnace repairs often died because the pressure sensors were tripped by stuff sucked into the air intake valve.

That does not happen very often, but it is something to check if you have a Trane. A different common problem furnaces have is with condensation. Of ash? Oh, ash and soot can build up in the exhaust and block that, along with clogging the filters. But I’m talking about water. It is a furnace burning gas. Where’s the water coming from, assuming the basement did not flood? If the basement did flood, you’d need to replace all the electronic components if not the mechanical and electrical ones. That would be just about everything in the furnace. The gas plus oxygen creates carbon dioxide and water vapor. If there’s poor venting of drainage of the water vapor, you get water inside the furnace putting out the flame if not rusting the insides.

That’s why you need regular maintenance to clean it, replace sensors as necessary and check for cracks in the heat exchanger. You have to do that regularly with a lot of furnaces just to keep the warranty in effect..

As found on Youtube