How much does it cost to fix Biasi error code E73?

Typical repair cost for the Biasi E73 fault is £120-220 including labour.

E73 High

Biasi E73 Fault Code

Q: What does the Biasi E73 fault code mean?

Your boiler has stopped working because one of its internal sensors is sending incorrect information while the system tries to perform an automatic self-check.

The Biasi E73 fault code means: your boiler has stopped working because one of its internal sensors is sending incorrect information while the system tries to perform an automatic self-check.. It appears on 1 Biasi model in our database.

Technical description: C.H. heating delivery probe NTC or return probe NTC or Flue gas NTC or D.H.W. NTC fault during calibration

Typical repair cost £120-220 (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 E73 fault code

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

Rinnova Adaptive Combi Repair: £120-220

Source

Biasi E73 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