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www.comfort-pro.com/2014/12/why-is-my-furnace-so-loud

To see if the banging is caused by a gas-ignition problem, watch the furnace start up. Leave the doors on the furnace. If you can see into the furnace doors, you should be able to see what is happening. If not, listen in order to pinpoint where the noise is coming from. Watch to see if the doors on the furnace are at all shaking.

highperformancehvac.com/gas-furnace-making-noise-fix

First, is the gas burners. A lot of inshot gas burners make a noise when they are burning the gas. Additionally, unless you have a standing pilot gas furnace which is an older type of gas furnace and not typical in the average home today, your furnace will have an induced draft or forced draft motor to properly vent the combustion gasses and give the combustion chamber combustion air.

www.hunker.com/13415662/my-furnace-is-making-a-loud-noise

While most furnaces perform well with basic care and maintenance on a regular basis, users may occasionally experience problems. One such concern is if the furnace makes a loud noise. Some noises are normal as pipes, ducts or metal parts heat up and cool down, such as chirping, rattling or a boom. Other noises may indicate a problem.

www.wfsmith.com/blog/5-furnace-noises-you-shouldnt-ignore

Below, we’ve outlined five furnace noises you shouldn’t ignore. Warning Signs Your Furnace Needs Repair. Noises are usually an indication that your furnace needs routine maintenance or repair. However, some noises can indicate an issue with your furnace which could possibly put you and your family at risk.

www.thespruce.com/whats-causing-your-noisy-furnace-4118946

What’s Causing Your Noisy Furnace? Pin Share Email button Search Clear Search Decor ... Turn off the power and gas to your furnace if you notice loud or unusual sounds. Continuing to use a malfunctioning furnace can cause serious damage to the unit and require expensive repairs. ... Use this list of common furnace-related noises and their ...

www.nicholson-hvac.com/banging-grinding-whining-3-furnace...

Banging, Grinding, Whining: 3 Furnace Noises You Shouldn’t Ignore . ... Once the gas ignites it makes the loud banging noise. Basically, it’s a mini-explosion in the furnace. Don’t ignore this noise. These small explosions can crack the heat exchanger, which is expensive to repair.

www.hunker.com/13415597/why-is-the-furnace-making-a-loud...

The transformer takes normal household current and steps it down to a level used by the furnace. It is located in different places in different furnaces, but is typically near the rest of the electrical components. As current passes through some transformers, a humming noise results.

www.ajperri.com/blog/why-your-furnace-is-making-loud-noises

• If you hear extremely loud banging sounds shut the heating system off, something most likely has broken and disconnected. • If you hear a banging noise when the furnace turns on followed by no hot air, dirty furnace burners may be to blame. Dirty furnace burners let gas accumulate in the furnace before the gas ignites.