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Serving Metro Atlanta & Surrounding Areas

Cunningham Associates
Heating and Air Conditioning, Inc.

Why is My Furnace Making That Weird Sound?

Your furnace operates at a relatively low noise level. The few sounds it does make are not disruptive and usually go unnoticed as the winter drags on. That’s why a sudden change can indicate your furnace is suffering from a malfunction. The type of noise your furnace is emitting can help you pinpoint the cause behind the sound. If your system is making an unusual noise, and you’re concerned, keep reading to find out what the sound means for the health of your furnace.

Rattling…

A rattling or banging sound can indicate a component in your furnace has come loose. Unfortunately, without inspecting the unit there is no way to tell which part is no longer secure. Ignoring the sound can lead to the malfunction getting worse, meaning the rattling will grow louder, and the loose component will completely disconnect. If this happens, turn your furnace off immediately, and contact a HVAC specialist. Having your system inspected before the rattling or banging increases in volume is crucial when it comes to saving your furnace from a serious breakdown, and keeping your repair cost manageable!

Squealing…

A furnace that squeals points to a blower motor that lacks proper lubricant between its moving parts. The friction created as the components in the motor rub together produces the unfortunate noise. During a yearly inspection, a HVAC technician examines the blower motor to ensure it has enough oil, and if it doesn’t, they add the needed amount. If you didn’t get your furnace serviced before the heating season started, and your unit is squealing, it’s time to give us a call.

Clicking…

Clicking sounds coming from your furnace can signal an issue with your unit’s igniter. If the sound lasts for only a minute or two, the igniter is likely dirty and needs to be cleaned. A problem with the flame sensor is also a possibility. The flame sensor acts as a safety mechanism, which ensures there’s a flame present when the gas valve opens. Without a flame sensor, gas would be released with no flame to ignite it. If the sensor is malfunctioning, it may not sense a flame even when a flame is present. If this happens, the gas valve will close prematurely. Problems with your furnace igniter should be addressed immediately by a highly trained HVAC technician.

When your furnace works to warm your home, the only sounds you should hear are a quiet hum and a rush of air flowing through your vents. If those noises are replaced by a sound you’re not familiar with, please contact our team here at Cunningham Associates to schedule an appointment.

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