How much does it cost to fix Biasi error code E52?

Typical repair cost for the Biasi E52 fault is £120-350 including labour.

E52 Emergency

Biasi E52 Fault Code

Q: What does the Biasi E52 fault code mean?

Your boiler has detected that exhaust fumes are not escaping correctly through the flue pipe or are being sucked back into the unit, causing it to shut down for safety.

The Biasi E52 fault code means: your boiler has detected that exhaust fumes are not escaping correctly through the flue pipe or are being sucked back into the unit, causing it to shut down for safety.. It appears on 4 Biasi models in our database.

Technical description: Flue gas obstruction error (recirculation or flue obstruction)

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 E52 fault code

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

Source

Biasi E52 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