Rinnai Flue Gas Spillage / Venting Failure

Boiler or flue area smells strongly of exhaust or combustion fumes inside the property.

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.

Possible Causes

Disconnected or damaged flue pipe, Blocked flue terminal, Negative pressure in boiler room, Failed flue seals

How to Fix / Troubleshooting

Critical safety warning: Flue gas spillage can expose occupants to carbon monoxide. Turn off the boiler immediately and ventilate the area.

Shut down boiler: Turn off power and gas to the boiler.
Check flue integrity (visual): Inspect visible sections of the flue for disconnections, cracks, or missing seals. Do not operate the boiler if any defects are found.
Ventilate: Open windows and doors to clear fumes.
Professional inspection: A qualified technician must pressure-test and verify the entire flue system and combustion safety before the boiler is used again.

Repair Difficulty

Professional Required 5/5

Required Part

Flue Vent Pipe Assembly

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