Is Your Furnace Making Odd Noises?

If your furnace (heater) begins making loud or bizarre noises, it might be a clear sign of trouble. Furnaces tend to be the one appliance in your home that can be left alone. However, you likely recognize what sounds to expect from your furnace when it’s operating like it’s supposed to, so noise that’s out of the ordinary needs your attention. Your furnace may get your attention by making a few of these sounds.

  • Screeching Noise: If you hear a screeching noise, it may be a problem with the motor, or a bearing within the motor that is making the noise.
  • Metallic Chirping Noise: If you hear a metallic chirping noise, it could be caused by the wheel slipping out of alignment, a motor mount might be coming loose, or your bearings could be going out. Sometimes you might be able to wiggle the wheel to get the alignment to resolve itself, but if you are unsure about what you’re doing, it’s just a better idea to have an experienced HVAC tech take a look.
  • Rattling sound: If you hear a noisy rattling sound when your furnace turns off, it is probably the metal parts to your furnace cooling down. However, it may also be something more serious. The blower might be out of alignment or a problem in the motor occurred. If you hear this noise you should give Precision a call.
  • Clanging noise: If you hear a clanging noise, the problem is most often in the pipes, not the furnace itself. This tends to happen when the pipes are able to cool down and contract after the furnace shuts off.
  • Loud Boom or Thud: A loud boom or thud sound may start somewhere inside the ducts. They occasionally expand and contract in cold weather, particularly if the furnace’s surroundings aren’t heated. However, it can also be evidence that the burners in the furnace are dirty and should be cleaned. These are fairly easy to clean by yourself if you use hot soapy water. If you want to clean these yourself, make sure they are totally dry before putting them back. If you learn that it’s not the ducts or the burners, it may be that your gas valve is malfunctioning (assuming you have a gas furnace), which can cause a delayed ignition. In many cases, it is a good idea to call Precision so one of our seasoned HVAC technicians can evaluate the problem.
  • Pinging and or Popping: A pinging or popping sound is typically coming from one of the ducts and is not really something to fret over.
  • Odd Vibrating Noise or Whining: If you hear an unusual vibrating noise or whining, it may reveal a problem with your furnace. It might be serious, so a Precision technician really needs to check it out.
  • Loud Humming: A loud humming noise may come from when the furnace burners light and its cold outside. You can eliminate this noise by turning the “off/pilot/on” control to shrink the burner flame.
  • Rattling Noise When the Furnace Starts Up: If you hear a rattling noise when the furnace starts up, it might be a motor bearing going out.
  • Crackling Noise: A crackling noise is more than likely a result of the metal parts of your furnace cooling down when the furnace shuts off.
  • Clunking and Banging: A clunking and banging sound is sometimes a cracked belt. If you hear this noise you ought to have a Precision HVAC tech out to your home to replace the belt.

Have Your Furnace System Checked by an HVAC Professional

For the most part, if your furnace is making sounds that are seem out of place its always a good idea to schedule one of our NATE Certified HVAC technicians to visit your home to do a system diagnosis to reveal any hidden problems before it’s too late. As they say, an ounce of prevention is worth a pound of cure.