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Heating · New Hampshire

Furnace Making Loud Noise

A boom on ignition or a grinding blower is a part telling you it's working under stress, and catching it early costs less than catching it after it lets go.

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When this becomes an emergency

What a pro does

Different noises come from very different places, so the first job is matching the sound to the moment it happens. A thump right at ignition usually means fuel pooled for a beat before it caught, and every one of those events puts a shock through the heat exchanger. Scraping or grinding tied to blower speed points at bearings, a wheel rubbing its housing, or debris that found its way in. Squealing sits with a dry motor or a slipping belt on older equipment. Loose panels and unsecured duct takeoffs make an alarming racket for almost no reason at all, and they're quick to rule out first.

Frequently asked questions

Yes. Delayed ignition puts a pressure shock through the heat exchanger each time it happens, and repeated over a season that becomes a safety concern rather than a noise complaint.
Long hard runs load the equipment differently than short shoulder-season cycles, so a marginal bearing or a hairline crack in a duct joint announces itself once the system stops resting.
Often. Sheet metal expanding as it heats will bang against a joist or a hanger, and that noise travels through the house far better than the sound of the equipment does.
It helps a lot. A short clip on a phone, along with whether it happens at startup, mid-cycle, or shutdown, narrows the list before anyone opens a panel.

Furnace Making Loud Noise?

Get connected with a local pro now.

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