Why Is My Furnace Is Making A Loud Noise

4 Reasons why your furnace is making unusually noises

Are you asking yourself why is my furnace making loud noises? Isn't modern furnace supposed to be quieter?

Yes, you're correct. In this generation furnace technology efficiency do operate quietly most of the time. If your furnace is ratting, screeching or banging its telling you something is wrong.

Never Ignore unusual nosies coming from furnace

• High pitched screeching or whistling

• Rattling

• Banging or booming

• Scraping sound

Causes of Loud Noises

Dirty Furnace Filter

Some Cases dirty furnace filter causes screeching or whistling noise. Replace your furnace filter regularly, we recommend purchasing disposable filters and replace your furnace filter every 1-2 month during heating operation. If filter is dirty and clogged within 1 month replace it with a new one. Lack of furnace replacing furnace filter will continue to restrict airflow to the point where furnaces blower motor or heat exchanger might become dangerously damaged.

Blower Motor

Furnace blower motor is responsible for air circulation throughout the house. If it becomes worn out or damaged it can make various of unpleasant noises. One common noise with defective blower motor is squeaking or screeching. The motor bearings are worn out and in need of replacement. Another concerning noise is a buzzing noise which occurs if there is an electrical problem within the motor windings.

Cracked Heat Exchanger

Rattling/banging noise can indicate a defective heat exchanger. When you don't change the filter regularly and operate the furnace with clogged filter, the airflow becomes restricted causing your furnace to reach point where excess heat gets buildup and cause a crack on the heat exchanger.

Defective heat exchanger is extremely hazardous as it can cause Carbon Monoxide leak a colourless, odourless and very highly lethal gas. If you suspects this problem shut off the furnace immediately and contact qualified HVAC technician soon as possible.

TIP: We highly recommend to install carbon monoxide detector where you and loved ones sleep, incase of CO leak the CO detector can monitor levels of this deadly gas as CO is odourless and colourless. We highly recommend scheduling furnace maintenance annually.

Where to buy carbon monoxide detector?

Amazon, Costco or any hardware store provides carbon monoxide detector to purchase.

Ignition Problem

Nowadays furnace all have electronic igniter which can lead to noisy furnace startup. Some electronic igniter create spark or surface ignition to ignite the gas. If damaged or worn out ignition component it may produce erratic spark or fail to spark leading to clucking or clicking sound when the furnace tries to start up.

Conclusion

In conclusion, when your furnace is making a loud/unusual noise when starting there are several potential reasons to consider.

Defective heat exchanger, ignition problem and blower motor can all contribute to unusual noises coming from your furnace. Contact us today or your local HVAC company and have technician troubleshoot your furnace. We offer same day furnace repair service anywhere in the GTA.

Remember to seek professional help when it comes to diagnosing/repairing furnace then DIY. Stay safe and keep warm.

Trust Your HVAC System With Diamond Air

At Diamond Air we provide same day HVAC service our experienced technicians provide professional furnace maintenance, repair and replacement. Contact us today to schedule diagnostic and seek professional help.