Is Your Furnace Making Odd Noises?

If your furnace (heater) is making loud or bizarre noises, it might be a warning sign of trouble. Furnaces are usually the one system in your home that can be neglected. However, you also know what sounds should be coming from your furnace when it’s performing like it’s supposed to, so anything out of the ordinary needs your attention. Your furnace might get your attention by making one or two of these sounds.

  • Screeching Noise: If you hear a screeching noise, it could be an issue with the motor, or a bearing in the motor that is producing 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 broken or loose, or your bearings could be worn down. Sometimes you are sometimes able to shake the wheel to get the alignment back to normal, but if you aren’t certain of what you’re doing, it’s always 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 can also be something more unpleasant. The blower could 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 may 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 sometimes expand and contract in cold weather, most often if the furnace’s surroundings aren’t heated. However, it may also be evidence that the burners in the furnace are dirty and need to be cleaned. These are comparatively easy to clean by yourself by using hot soapy water. If you do attempt to clean these yourself, be sure they are entirely dry before reinstalling them. If you learn that it’s not the ducts or the burners, it could be that your gas valve is faulty (should you have a gas furnace), which can cause a delayed ignition. In most cases, it is better to call Precision so one of our knowledgeable HVAC technicians can diagnose 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 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 stop 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 activates, it may 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 often 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 Furnace System Evaluated by an HVAC Professional

Overall, 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 come out to your home to do a system diagnosis to determine any possible problems before it’s too late. As they say, an ounce of prevention is worth a pound of cure.