E75 Emergency

Biasi E75 Fault Code

The Biasi E75 fault code means: your boiler has detected an unsafe level of combustion gases and has shut down as a safety precaution before it can adjust its settings.. It appears on 1 Biasi model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: High CO before gas valve calibration
Typical repair cost £120-350 (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 E75 fault code

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

Source

Biasi E75 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