HVAC systems are major pieces of equipment in your home, and important for your year-round comfort and health. And yet, we don’t really give our heating and cooling systems much thought until something goes wrong. Here are three of the most common heating problems and what might be causing them.
My Furnace Won’t Start
When your furnace won’t ignite, the first things to check are that the air filter is still clean and that the power and the gas supply to the furnace are connected.
From there, if your furnace commences the start cycle, but then does not fire up, it could be that your sensor or ignitor is dirty or damaged and needs to be either cleaned or replaced. These are not necessarily DIY fixes, but they can be if you are comfortable with it.
The flame sensor takes care of igniting and maintaining the flame in your furnace. It’s not uncommon for a sensor to get dirty from carbon buildup or other particles within its enclosed space, and it does require periodic cleaning. If you feel confident to do this yourself, make sure the furnace is turned off, and it’s not a bad idea to switch off the breaker just to be safe. You’ll find the sensor by looking for the metal rod in the path of the burner with a wire attached to it. See if you can remove the sensor. This is generally done by removing the screws and pulling off the wire. It can be cleaned with sandpaper or steel wool, and then screwed back into place and the wire reattached.
The furnace ignitor is responsible for starting up the furnace, as its name implies, and sometimes needs to be replaced. To do this, as with the sensor, make sure the furnace is completely off before doing anything. The ignitor is usually found near the center of the burners. Unscrew it, be careful to see where and how it fits, and then screw the replacement ignitor into place.
If you are not 100% sure of what’s causing the problem, or unsure about doing these jobs yourself, it should be quick and inexpensive to have an HVAC professional drop by and do it for you as part of your system’s routine maintenance.
Why Is My Furnace Leaking?
Nowadays most of us have either a standard gas furnace or a newer high-efficiency gas furnace, and each has different causes for leaking.
A standard gas furnace doesn’t leak that often. If you have a humidifier built into your central heating system, that could be a likely cause of leaking water. The other cause could be an incorrectly installed flue or exhaust pipe. If that flue is faulty or improperly installed, it can cause heat to be trapped. This heated air will eventually cool and any vapor will convert to liquid, which will then go down into the heater or onto the floor. If you haven’t already guessed, this can cause significant damage to your furnace, and it’s not something you can fix yourself. Call a professional HVAC tech right away.
If you have a more modern, high-efficiency gas furnace, there are a different set of causes for leaks. These furnaces use a method to create heat where there is a small timing break in between the actions, during which the air in the furnace is allowed to cool, and that creates some condensation. This condensation is a normal part of the process and is routinely disposed of by the furnace drain system. Sometimes, you’ll have leaks if the drain line is clogged or damaged, or if a heat exchanger is not working correctly. This is less serious than leakage in a standard-type furnace, but still something you should get fixed by a professional.
There Are Strange Noises Coming From My Gas Furnace!