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518 Heating
518 Heating
Heating · New York

Furnace Making Loud Noise

A boom at ignition or a grinding blower means a part is already under real strain, so call while it's still a repair rather than a replacement.

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When this becomes an emergency

What a pro does

Sound narrows the search fast. A thump shortly after the call for heat points at delayed ignition, where fuel accumulates for a moment before catching, and every one of those little explosions works against the heat exchanger it happens inside. Bearings shriek when they're dry. Sheet metal booms and flexes as ducts heat up, and in an old house with runs threaded through joist bays and stone walls that expansion noise can travel two floors and sound far more alarming than it is. A tech listens at the burner, the blower, and the duct takeoffs separately, because the same complaint from the kitchen can come from three different places downstairs.

Frequently asked questions

No. Delayed ignition puts a pressure pulse through the heat exchanger every single cycle, and cracked exchangers are a combustion-safety problem rather than a comfort one.
Dry bearings or a slipping belt on older equipment. Both are audible well before the motor actually seizes, which is what makes an early call worthwhile.
Retrofit ducts often run tight through framing with little room to move, so metal expanding against wood transmits every pop straight into the rooms above.
Partly. Describing when it happens in the cycle narrows things considerably, though confirming which component is making it still needs someone standing next to the equipment.

Furnace Making Loud Noise?

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