Furnace Making Loud Noise

A boom on ignition or a whine from the blower means a component is loaded past where it should be, so call before it takes something else with it.

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When this becomes an emergency

There is a thump or a boom at the instant the burner lights.
A high metallic whine comes from the blower while it runs.
Something rattles in the cabinet and keeps rattling longer each cycle.
Neighbors upstairs can hear the unit when they never used to.

What a pro does

The character of the sound narrows the diagnosis before anyone opens a panel. A boom at light-off suggests gas accumulated briefly before igniting, and each repetition shocks the heat exchanger, which is why that one gets looked at rather than tolerated. Whines and grinds come from the blower assembly, and listening at the motor, the wheel, and the belt in turn separates a dry bearing from a motor that's finished. Ductwork in older basements is often strapped loosely, and a duct panel drumming at a certain blower speed sounds far worse than it is.

Frequently asked questions

Is a bang at startup something to worry about?

Yes, more than most noises. Delayed ignition puts a shock load on the heat exchanger every time, and a cracked exchanger becomes a combustion safety problem.

Can loose ductwork really make that much noise?

It can. Sheet metal drums at specific fan speeds, and tightening a strap or adding a hanger sometimes ends the whole complaint.

Does a whine mean the motor needs replacing?

Not necessarily. Bearings and belts make similar sounds, and the repair for those is much smaller than a motor swap.

Is it safe to keep using the furnace with a new noise?

Brief use to pin down the sound is fine. Grinding or banging left alone for weeks tends to turn into a no-heat call at the worst possible time.

Furnace Making Loud Noise?

Get connected with a local pro now.

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