Furnace Sounds and Smells To Look Out For

Are you hearing strange things and smelling something different from your furnace? Do not ignore these sensory signs as these may indicate problems and safety issues regarding your furnace. It is important to know what is wrong with your furnace so you can address problems immediately.

What Sounds and Smells Should You Look Out For?


  1. Burning Smell

If there is a burning smell when you open your furnace the first time after a long time, then there is no reason to be alarmed. However, when the smell persists, there may be an oil leak or electrical problem. A defective furnace can be a serious fire hazard so do not dismiss smoke or a burning smell.

  1. Moldy Smell

If your furnace is emitting a moldy smell, your furnace may have a serious mold issue. Moisture may accumulate in your furnace after some time and this is probably the reason for the growth of molds. It is important that you address this problem immediately because molds, when you breathe them in, can cause serious health problems.

  1. Rotten Egg Smell

When your furnace emits a rotten egg smell, it may be sulfur. When this happens, there is a potential gas leak that may cause an explosion or fire. When this happens, leave the building and contact a utility company to help you address this issue immediately.


  1. Rattling Sound

If you hear some rattling sound from your furnace, it is a possibility that a small object or toy fell into the vents. When this happens, check if you can get the object out on your own. If you cannot, contact a professional to help you clear out your furnace.

  1. Squealing Sound

A squealing sound from your furnace may indicate a belt problem. A broken belt can cause your furnace to shut down so it is a good idea to replace your belt immediately when you hear some squealing or shrieking sound from your furnace.

  1. Banging Sound

When your furnace makes banging noises when you turn them on, it may be an indication of a delayed gas ignition or the expansion and contraction of air ducts. It will be best to call a professional to help you diagnose the problem, as this may mean that your furnace needs some serious repairs.

If you smell or hear these sounds from your furnace, do not ignore them as they may indicate serious problems that can put you and your family at risk. Contact a heating professional to help you diagnose and fix your furnace problems.

Written by APM Construction Services, a construction and home maintenance company that is the best choice for heating and cooling in Columbia, MO.