13
Biasi
Flue System / Fan Speed Fault
Boiler shows error 13, display may indicate flue or fan fault, boiler will not ignite.
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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
Incorrect flue installation or length, Blocked flue, Faulty fan speed sensor (if fitted), PCB fan control fault
How to Fix / Troubleshooting
Safety: Isolate power and gas. Flue work must be carried out by a competent boiler engineer.
- External flue check: Inspect the Biasi flue terminal for obstructions and ensure the terminal type matches the installation (horizontal/vertical).
- Check for signs of condensate leakage: Staining around the flue joints may indicate incorrect fall or blockage.
- Engineer inspection: A technician should verify flue length and configuration against Biasi installation limits, inspect internal flue seals, and test fan speed feedback (if applicable).
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Repair Difficulty
Professional Required
5/5
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