Furnace Making Loud Noise

A boom at ignition or a grinding blower says a part is working under stress it wasn't built for, so call before that part quits on a cold night.

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When this becomes an emergency

A dull thump or boom lands a second or two after the burner tries to light.
Something shrieks or grinds near the blower housing whenever the fan spins up.
A rattle builds the longer the unit runs and stops when it shuts down.
The sound carries through the ductwork into rooms far from the unit.

What a pro does

Different noises mean genuinely different things. A delayed boom points to gas collecting in the chamber before it finally lights, and every one of those events puts a shock load on a heat exchanger that's supposed to expand gently rather than get hit. Squealing is a bearing or a belt. Grinding is usually further along than that. A technician isolates the source by listening at each component through a startup and shutdown, then checks the easy suspects, because a panel that isn't latched or a duct joint that's worked loose can drum through a whole house and sound far more alarming than it really is.

Frequently asked questions

How concerning is a boom at ignition?

It deserves attention. Repeated delayed ignition puts sudden pressure and thermal shock on the heat exchanger, and a cracked exchanger becomes a safety matter rather than a noise complaint.

Why does the noise seem to come from another room?

Sheet metal ducting transmits vibration extremely well, so a sound generated at the unit can seem loudest at a register two floors away.

Can cold weather make a quiet furnace suddenly noisy?

It can. Metal contracts in the cold and longer run times raise duct pressure, so ticks and pops that never registered in mild weather become obvious in January.

Should it keep running until someone can look at it?

Running it long enough to describe the sound accurately is useful, but a fresh grinding or banging noise shouldn't be lived with for a week.

Furnace Making Loud Noise?

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