Viessmann
Flue Gas Leakage
Smell of exhaust fumes or burning around the water heater
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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 flue connection at boiler collar, Cracked flue pipe, Missing or damaged flue seals, Blocked flue causing spillage
How to Fix / Troubleshooting
Safety: Turn off the heater immediately. Risk of carbon monoxide poisoning. Do not use the appliance until the flue system is checked.
- Ventilate: Open windows and doors to ventilate the area.
- Inspect visible flue: Look for disconnected or damaged flue sections near the boiler. Do not operate the unit with the flue disassembled.
- Check flue collar: Ensure the flue is securely locked into the Viessmann flue collar and that seals are present.
- Professional inspection: Arrange for a qualified technician to perform a full flue integrity and combustion check before restarting the heater.
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Repair Difficulty
Professional Required
5/5
Required Part
Concentric Flue System
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