Furnace Repair
No heat, cold air, short cycling, ignition faults, blower failure, and strange furnace noises in Everett homes — diagnosed and repaired by Everett Air HVAC.
Read MoreThe short answer
Furnace noises are diagnostic, and when they happen matters as much as what they sound like. A loud bang at ignition can mean delayed ignition, where gas pools and then ignites at once — switch the system off and call. Rattling often points to loose panels or blower trouble, and squealing often points to blower motor or belt wear. Never open the unit to investigate a noise, and never run a furnace that bangs at ignition.
A furnace that has run quietly for years and suddenly starts banging, rattling, or squealing is telling you something changed. Homeowners often ask whether a new noise is normal wear or a warning. The honest answer is that the timing and pattern decide it: a noise at ignition is treated differently from a noise that appears mid-cycle, and any noise paired with a gas smell or a carbon monoxide alarm is treated as urgent.
What you notice
- A loud bang or boom at the moment of ignition, sometimes strong enough to move a panel.
- Rattling or vibration while the blower runs.
- A high-pitched squeal that was not there before.
- Whistling from returns or registers, or a rumbling sound as the unit runs.
