Worn-out ball bearings, clogged burners, etc., are some of the common causes of the scraping or loud banging sounds you may hear as your furnace works. In this scenario, you need a professional to run detailed diagnostic checks to isolate the problem.

 

Don’t attempt to troubleshoot the problem if you experience any of the more serious  furnace problems. Opening the furnace to see what’s happening inside will rarely end well. Apart from voiding your warranty, there’s a high chance you’ll cause more damage than correct the problem.

 

Fortunately, you’re unlikely to experience any issues that will require expensive furnace repairs within the first decade of using your furnace. In the rare event that a problem occurs, your warranty may cover the repair.

 

However, as the unit ages, you’ll see more of these costly repairs. At this point, it may be in your best interest to consider a new heating system.