Weil-McLain water heater’s combustion air intake is drawing in lint, dust, or debris from the mechanical room.

Safety first: Contaminated combustion air can damage the burner and produce carbon monoxide. Address promptly.

• Inspect intake location: Verify that the combustion air intake terminates outdoors if the unit is designed for direct vent. If it draws from the room, ensure the room meets Weil-McLain combustion air requirements.
• Clean intake screen: Remove and clean any intake screens or grilles clogged with lint or dust.
• Relocate chemicals: Do not store bleach, pool chemicals, or aerosols near the water heater; their vapors can corrode burners and heat exchangers.
• Improve room ventilation: If the room is under negative pressure (e.g., due to exhaust fans), provide additional makeup air openings.