Hoval
Flue gas leakage
Visible white steam or flue gas escaping around the furnace casing or flue joints
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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 connections on Hoval flue system, Deteriorated flue gaskets, Corroded flue pipe, Incorrectly assembled concentric flue
How to Fix / Troubleshooting
Safety: Flue gas contains harmful substances. Turn off the furnace immediately and ventilate the area.
- Do not operate: Keep the furnace off until the flue system is fully inspected.
- Visual inspection: Check all accessible flue joints for gaps, missing clamps, or corrosion.
- Reseat joints: If you are competent and it is safe, reseat loose joints and tighten clamps according to Hoval flue installation instructions.
- Replace damaged parts: Any corroded or cracked flue components must be replaced with Hoval-approved parts by a qualified technician.
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Repair Difficulty
Professional Required
5/5
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