Furnace is very noisy during operation, with loud rumbling, whistling, or roaring sounds.

Safety: Turn off power and gas before inspecting internal components.

Steps:

• Identify noise source: Remove the front panels and carefully listen (with the furnace running, if safe) to determine if the noise comes from the blower, inducer, or burner area.
• Check blower wheel: With power off, spin the blower wheel by hand. Tighten the set screw on the motor shaft if loose and ensure the wheel is centered.
• Inspect burners: Look for rust, debris, or misalignment. Clean burners according to Atlantic service instructions.
• Ductwork: Inspect nearby ducts for loose panels or thin metal that can vibrate. Reinforce or add insulation where needed.

Warning: Roaring or booming at ignition can indicate delayed ignition or improper gas pressure and should be evaluated by a gas technician.