Noritz Flue Gas Leakage / Venting Problem

Strong exhaust or burning smell near the boiler during operation.

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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

Loose vent joints, Cracked vent pipe, Improperly sealed combustion chamber, Exhaust recirculation into intake

How to Fix / Troubleshooting

Critical safety: Flue gas leakage can expose occupants to carbon monoxide. Turn OFF the boiler immediately and ventilate the area.

  • 1. Inspect venting: Check all visible vent and intake pipes for disconnections, cracks, or melted sections. Ensure joints are fully engaged and properly supported.
  • 2. Check terminations: Outside, verify that exhaust is not blowing directly into the intake or nearby openings.
  • 3. Do not operate: Do not use the boiler until venting defects are corrected.
  • 4. Professional service: Have a qualified technician or installer repair or replace vent components and perform a combustion safety check.
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Repair Difficulty

Professional Required 5/5

Required Part

PVC/CPVC/PP Vent Pipe Assembly
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