North Dakota Heating
North Dakota Heating
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Furnace Making Loud Noise

A boom at light-off or a grinding blower means a part is working under stress it wasn't built for, so it's better to have someone listen to it now than after it lets go.

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When this becomes an emergency

What a pro does

Every noise has its own short list. A delayed-ignition whump means fuel accumulated in the burner box before it found a flame, and each one of those hammers the heat exchanger, so a tech looks at burner condition, gas or propane pressure, and ignitor position rather than just turning the unit down. Screeching almost always traces back to a bearing that's dried out or a belt on an older forced-air blower. Duct booming is a different animal altogether, usually oversized sheet metal flexing as pressure changes, and it gets fixed at the duct rather than at the furnace.

Frequently asked questions

A rattle can wait a few days. A repeated bang on ignition is worth moving up, because the pressure wave is what eventually cracks a heat exchanger.
Bearings dry out, belts stretch, and sheet metal work-hardens after thousands of heat cycles. Twenty winters of expansion and contraction shows up as noise long before it shows up as a failure.
It can. Starved return air raises velocity through whatever gaps remain, which turns into a whistle or a roar at the register and a strained sound at the blower.
Usually it's an annoyance rather than a fault, though it can point to a duct run that flexes badly enough to open its seams over time.

Furnace Making Loud Noise?

Get connected with a local pro now.

Tap to Call(866) 661-2784

Keep going

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