Is your furnace making odd noises?

If your furnace (heater) starts making unusual or odd noises, it might be a warning sign of trouble. Furnaces tend to be the one thing in your home that can be neglected. However, you probably know what sounds to expect from your furnace when it’s operating normally, so anything out of the ordinary needs your attention. Your furnace may 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 in the motor that is making the noise.
  • Metallic Chirping Noise: If you hear a metallic chirping noise, it could be caused by the wheel being out of alignment, a motor mount might be loose, or your bearings could be going out. Sometimes you may be able to wiggle the wheel to get the alignment to resolve itself but if you don’t know what you’re doing it is always a better idea to have an experienced HVAC Tech check things out.
  • Rattling sound: If you hear a noisy rattling sound when your furnace shuts off, it is probably the metal parts to your furnace cooling down. However, it may be something more serious. The blower may be out of alignment or a malfunction 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 more than likely in the pipes, rather than 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 be caused by the ducts, which can expand and contract in cold weather. Especially if where the furnace is located is not heated. However, it might be an indication that the burners in the furnace are dirty and need to be cleaned. These are relatively easy to clean yourself with hot soapy water. If you do attempt to clean these yourself, make sure they are completely dry before reinstalling them. If it’s determined that it’s not the ducts or the burners, it may be that your gas valve is defective (if you have a gas furnace), which can cause a delayed ignition. In most cases, it is wise to call Precision to have one of our experienced HVAC Technicians evaluate 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 worry about.
  • Odd Vibrating Noise or Whining: If you hear an odd vibrating noise or whining, it may indicate a problem with your Furnace and 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 reduce the burner flame.
  • Rattling Noise When the Furnace Starts Up: If you hear a rattling noise when the furnace starts up, it could be a motor bearing going out.
  • Crackling Noise: A crackling noise is more than likely caused by the metal parts of your furnace cooling down when the furnace shuts off.
  • Clunking and Banging: A clunking and banging sound indicates a cracked belt. If you hear this noise you need to have a Precision HVAC Tech out to your home to replace the belt.

Have your system evaluated by a HVAC Professional

Overall, if your furnace is making sounds that are out of the ordinary its definitely a good idea to schedule one of our NATE Certified HVAC Technicians to come out to your home to do a system diagnosis to evaluate any potential problems before its too late. As they say, an ounce of prevention is worth a pound of cure.