Why Does My Furnace Make a Loud Banging Sound?

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A loud furnace is a symptom of another problem that should be resolved quickly before using.

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We can quiet down even the loudest home heating system.

A loud banging noise happens when the furnace starts?

This is a common problem on home furnaces that are not properly maintained or are suffering from a mechancial breakdown. The technical term for this is delayed ignition. Do not confuse this with a loud banging when the fan turns on. This banging occurs when the furnace ignites the burners and not all the burners ignite at the same time.
When the furnace seeks to ignite the burners I will typically ignite a single burner and that burner either ignite the next burners by the flames jumping from burner to another. Sometimes a long pilot ignites allt he burners. This is referred to a burner spread tube. If one of the burners fails to ignite the chamber fills up with gas until the gas rolls out of the chamber and ignites in an explosion when reaching the nearest lit burner.

This is Very Dangerous

If you are experiencing burner explosions of any type shut down your furnace and give us a call for repairs. A night or two of wearing sweaters and extra blankets on the bed is much preferable to burning down your home.

Safety Precaution

If you are having a delayed ignition problem on your forced air furnace do not look directly into the burners to see what is occurring. The flames can actually leap out of the burners by as much as three feet. I have had burns in the past because of this and even had an employee hospitalized after burning their retinas.

What Can Cause Those Furnace Explosions on Forced Air Heaters

  • Incorrect fuel air mixture
    Dirty burners
    Dirty pilot (self-igniting or standing pilots)
    Too much gas pressure
    Not enough gas pressure
    Water in the gas valve or gas line
    Cracked firebox blowing into the combustion chamber
    Spider webs or other debris blocking the gas orifice(s)
    Not enough combustion air (the flames reach out of the firebox)
    Open blower door with the fan running (creates a vacuum and pulls the flames out)
    Blocked flue

Don't Panic

These repairs will not break the bank and most are simply performed on a minimal service call. Give us a call and find out how affordable your furnace repair really can be.

With one simple Tune-Up, you are able to get more comfort, lower your energy cost and actually reduce the risk of future repairs. The number one cause of system failure is dirt! Don't let a dirty un-tuned system cost you money out of your pocket!