Exhaust smell or suspected carbon monoxide near the unit or in the home

Safety first: Carbon monoxide is deadly. If CO alarms sound or you suspect exhaust in living spaces, turn OFF the heater, evacuate, and call emergency services.

Steps to check (once safe):

• Inspect vent connections: Ensure all vent joints are secure and properly sealed.
• Check terminations: Confirm intake and exhaust terminations are clear and properly located per Rinnai guidelines.
• Ventilation: Ensure the mechanical room has adequate combustion air openings.

When to call a professional: A qualified technician must evaluate and correct venting and combustion air issues before the unit is used again.