Noritz Combustion / Venting Safety Issue

Noritz water heater exhaust smells strongly of gas or combustion fumes; occupants may notice headaches or irritation.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Vent pipe disconnected or leaking, Blocked vent termination, Incorrect vent materials, Incomplete combustion due to gas or air issues

How to Fix / Troubleshooting

Critical safety warning: If you smell gas or suspect carbon monoxide, turn OFF the heater, evacuate the building, and contact your gas supplier or emergency services immediately. Do not attempt to operate the unit.

Steps to check (visual only for homeowners):

  • Inspect vent connections: From a safe position, visually check that all vent joints are connected and sealed. Do not disassemble venting while the unit is operating.
  • Check vent termination: Ensure the vent outlet is not blocked by debris, snow, or animal nests.
  • Do not use the heater: Leave the unit off until a qualified Noritz technician or licensed gas fitter inspects the combustion and venting system, performs a combustion analysis, and corrects any issues.
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Repair Difficulty

Professional Required 5/5

Required Part

Vent Pipe Assembly
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