Common Furnace Noises in Your Loveland, CO

Common Furnace Noises in Your Loveland, CO Home and What They Mean

October 27, 2022

Any mechanical system will make some noise when running, and your furnace is no different. You might hear several noises from your furnace, indicating a different problem. Here are some common furnace noises that indicate potential trouble in your Loveland, CO home and what they might indicate.

Grinding and Scraping

If you hear a grinding or scraping noise from your furnace, it’s most likely due to an issue with the blower motor. The blower motor is responsible for circulating air throughout your home, and if it’s not working properly, it can cause your furnace to make strange noises. Regular lubrication and HVAC maintenance can help prevent this issue from happening.


Rumbling noises are usually caused by air handler vibration. This is when the air handler, the part of your furnace that contains the blower, vibrates. The vibration can be due to a loose part or an issue with the motor mounts.


Rattling noises from your furnace are due to loose panels or ductwork. The panels on your furnace protect the inner workings of your furnace; if they’re loose, they can rattle when the furnace is running. Ductwork can also make rattling noises if it’s not properly secured.

Repeated Clicking

Heat cycle ignitions usually cause a clicking noise as the gas valve opens and closes. The clicking occurs as the igniter creates a spark that ignites the gas. If you hear this noise, it shouldn’t cause alarm as it’s a normal part of the furnace’s operation. However, repeated clicking noises could indicate a problem.


Loose or worn belts can cause your furnace to squeal when running. The belts help to keep the blower motor and other parts of your furnace running smoothly.

If they’re loose, they can cause your furnace to make a squealing noise. Too much tension and too little tension on these belts can also cause squealing.

Furnaces are complex machines; if you hear strange noises from yours, it’s best to call a professional. Contact A to Z Heating & Cooling to help you diagnose the problem and do the necessary AC repairs. Our HVAC technicians have great expertise and will help you get your furnace up and running again.

Image provided by iStock

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