How much does it cost to fix Biasi error code E09?

Typical repair cost for the Biasi E09 fault is £120-250 including labour.

E09 High

Biasi E09 Fault Code

Q: What does the Biasi E09 fault code mean?

Your boiler has detected that the exhaust gases are either too hot or are not flowing correctly through the flue pipe, causing the system to shut down for safety.

The Biasi E09 fault code means: your boiler has detected that the exhaust gases are either too hot or are not flowing correctly through the flue pipe, causing the system to shut down for safety.. It appears on 7 Biasi models in our database.

Technical description: Flue gas NTC probe / Flue pipes fault

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Biasi models that show the E09 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Biasi E09 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026