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Is Your Furnace Making Odd Noises?

If your furnace (heater) starts making loud or bizarre noises, it may be a clear sign of trouble. Furnaces are often the one thing in your home that can be left alone. However, you also recognize what sounds should be coming from your furnace when it’s performing like it should, so noise that’s out of the ordinary needs your attention. Your furnace could get your attention by making a few of these sounds.

  • Screeching Noise: If you hear a screeching noise, it may be an issue with the motor, or a bearing inside the motor that is creating the noise.
  • Metallic Chirping Noise: If you hear a metallic chirping noise, it might be caused by the wheel slipping out of alignment, a motor mount might be coming loose, or your bearings could be worn down. Occasionally you are sometimes able to wiggle the wheel to get the alignment to resolve itself, but if you are unsure about what you’re doing, it’s always a better idea to have an experienced HVAC tech handle things.
  • 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 might 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 most often in the pipes, instead of 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 have come from the ducts. They sometimes expand and contract in cold weather, namely if the furnace’s surroundings aren’t heated. However, it can also be a sign that the burners in the furnace are dirty and should be cleaned. These are fairly easy to clean yourself with hot soapy water. If you want to clean these yourself, be sure they are totally dry before placing them back inside. If you learn 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 many cases, it is wise to call Precision so one of our seasoned HVAC technicians can resolve 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 be concerned with.
  • 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 could 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 reduce 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 coming from 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 need to have a Precision HVAC tech visit your home to replace the belt.

Have Your Furnace System Reviewed by an HVAC Professional

To be safe, 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 potential problems before it’s too late. As they say, an ounce of prevention is worth a pound of cure.