The dust and dirt on a clogged air filter might cause a burning smell from the heat passing through it. We constantly remind you to change your air filters regularly, and this is especially important when using your heater. Replacing your old air filter with a clean, new filter could get rid of that nasty burning smell.
Anything near your heating unit or vents can cause a burning smell when the heat is on. If you haven’t used your heater in a while, it’s possible you may have placed flammable objects where they don't belong. Whether it’s fabrics, plastics or any other flammable material, check to make sure they're not in close proximity to your heating unit or register vents. In other words, make sure there is plenty of distance between objects that can burn and the heating elements that can burn them.
As we already mentioned, the initial burning smell from turning on a heater that’s been inactive for a long time is normal and should dissipate quickly. However, there are several causes that could bring about a burning smell and ways to identify them. The following are several types of burning smells that could emanate from your heater and what the causes could be:
Accumulated dust burning is the very common odor you smell when turning your heater on for the first time in a long time. This means dust has settled on the heat exchanger, burners and other heating components over the period of inactivity. So once the heat comes on, the dust burns off and the odor passes through your air vents. The smell of burning dust should go away after a while, so there’s no cause for alarm. However, if the initial burning dust smell has passed and your heater still smells like it’s burning, it could be something worse.
If your heating system is on and it smells like electrical wires are burning, then you have a more serious problem on your hands. This could be a sign of an overheated blower motor. Normally as a safety measure, your system will shut itself off if it overheats. However, if something is malfunctioning or damaged, your heater might continue to operate and become dangerously hot. The smell of electrical burning could also be exactly that: frayed or damaged electrical wiring. If your heater emits an electrical burning smell, it could be a cracked heat exchanger, which is a very serious and potentially dangerous problem. So if your heater is emanating an electrical burning smell, turn it off immediately and call us at 813-609-5015 for help!
Another smell coming from your heater could be that of burning plastic or rubber. Usually this means a foreign object such as a toy has found its way into your heating system. A plastic or rubber object burning will give off fumes and can be hazardous to breathe in. If you smell burning plastic or rubber, immediately shut off your furnace or heater and find the object that is burning. And if you can’t find the culprit in your heating system, vents or ductwork after a thorough inspection, call us immediately so we can locate the source and eliminate the problem. The smell of burning plastic or rubber is more serious than a misplaced object. It can mean electrical failure, so don’t run your heater if you can’t find what’s causing it to smell.
A musty odor is a sign of mold and mildew in your heating system or ductwork. Changing a dirty air filter could solve the musty smell problem. But if it doesn’t, you might need something more powerful like a home duct cleaning to sanitize the air. Duct cleaning uses specialized equipment for removing any and all bacterial growth from your ductwork. We should point out that while duct cleaning is highly effective at removing mold and mildew from your duct work, you should still schedule an inspection to find out if mold is growing in other parts of your home. A mold problem beyond your HVAC system requires a reliable mold removal company to rid your entire home of it.
Other types of smells you might encounter are smoky or oily smells, as well as an odor very similar to gunpowder. These are all signs of very serious problems that should only be addressed by a professional.