How much does it cost to fix Biasi error code Er 09?

Typical repair cost for the Biasi Er 09 fault is £90-160 including labour.

Er 09 High

Biasi Er 09 Fault Code

Q: What does the Biasi Er 09 fault code mean?

Your boiler has detected that a sensor monitoring the temperature of the exhaust gases is not working correctly, causing the system to shut down for safety.

Also written as ER09 — same fault.

The Biasi Er 09 fault code means: your boiler has detected that a sensor monitoring the temperature of the exhaust gases is not working correctly, causing the system to shut down for safety.. It appears on 2 Biasi models in our database.

Technical description: Faulty flue temperature probe NTC

Typical repair cost £90-160 (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 Er 09 fault code

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

Source

Biasi Er 09 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 27 April 2026