Is Your Furnace Making Odd Noises?

If your furnace (heater) is making loud or strange noises, it may be a clear sign of trouble. Furnaces are often the one system in your home that can be ignored. However, you likely know what sounds should be coming from your furnace when it’s operating like it’s supposed to, so something out of the ordinary needs your attention. Your furnace can get your attention by making some of these sounds.

  • Screeching Noise: If you hear a screeching noise, it could be a problem with the motor, or a bearing inside the motor that is making the noise.
  • Metallic Chirping Noise: If you hear a metallic chirping noise, it could be caused by the wheel falling out of alignment, a motor mount might be shaking loose, or your bearings could be worn down. Occasionally you might be able to adjust the wheel to get the alignment to resolve itself, but if you aren’t certain of what you’re doing, it’s just a better idea to have an expert 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 might also be something more serious. The blower can be out of alignment or an error 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 usually coming from in the pipes, not the furnace itself. This tends to happen when the pipes are able to cool down and contract after the furnace switches off.
  • Loud Boom or Thud: A loud boom or thud sound may have come from the ducts. They sometimes expand and contract in cold weather, namely if the furnace’s surroundings aren’t heated. However, it may also be an indication that the burners in the furnace are dirty and need to be cleaned. These are comparatively easy to clean yourself using hot soapy water. If you do attempt to clean these yourself, don’t forget to check that they are completely dry before reinstalling them. If you find out that it’s not the ducts or the burners, it may be that your gas valve is malfunctioning (if you have a gas furnace), which can create a delayed ignition. In the majority of cases, it is wise to call Precision so one of our seasoned HVAC technicians can troubleshoot the problem.
  • Pinging and or Popping: A pinging or popping sound is most likely coming from one of the ducts and is not really something to be concerned with.
  • Odd Vibrating Noise or Whining: If you hear a strange vibrating noise or whining, it may be coming from a problem with your furnace. It may 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 prevent 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 turns on, it could 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 switches 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 come to your home to replace the belt.

Have Your Furnace System Evaluated by an HVAC Professional

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