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Heating · Maine

Furnace Making Loud Noise

Equipment that has changed its voice is worth a look, and a bang at lightoff is the noise that shouldn't be left to run all winter.

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When this becomes an emergency

What a pro does

Sorting a noise means pinning down exactly when in the cycle it happens, which is why the first questions are about timing rather than about the sound itself. A bang shortly after the call for heat is delayed ignition, and it's the one that matters most, because every event stresses the heat exchanger. Screeching that comes and goes with blower speed is a bearing or a belt. Rhythmic knocking during a run frequently turns out to be a blower wheel out of balance, sometimes from a bit of debris, sometimes from a wheel that has collected years of grime unevenly. Salt-laden damp air ages motors and bearings faster than dry inland air does, so bearings deserve early attention here.

Frequently asked questions

Fuel that pools for a moment before catching goes off with force, and the shock travels through the heat exchanger. Repeated over a winter that becomes a safety issue.
It contributes. Moisture and salt in the air corrode bearings and windings over time, which is part of why blower and pump noises show up earlier near the water than well inland.
Yes, and it's more common than people expect. Anything from a scrap of insulation to uneven buildup on the wheel throws it off balance and produces a steady knock.
Not automatically. Expansion noise in ductwork is harmless, while ignition bangs and grinding bearings are not, which is the distinction a technician is there to make.

Furnace Making Loud Noise?

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