NTI
Flue Gas Leakage
Boiler emits exhaust smell or flue gas odor near the unit
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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 or disconnected vent joints, Cracked flue pipe, Failed flue gasket at boiler collar, Blocked vent causing spillage
How to Fix / Troubleshooting
Safety: This is a potential carbon monoxide hazard. Turn off the boiler immediately and ventilate the area. Install or check CO detectors.
- Inspect venting: Examine all NTI vent joints from the boiler to the termination. Tighten clamps and reseat gaskets as needed.
- Check for cracks: Look for cracks or holes in PVC/CPVC/PP vent pipes and replace damaged sections.
- Verify termination: Ensure the vent termination is not blocked by snow, ice, or debris.
- Professional test: Have a licensed technician perform a combustion and draft test to confirm safe operation before returning the boiler to service.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Vent Pipe and Gaskets
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