How much does it cost to fix Biasi error code 75°C?

Typical repair cost for the Biasi 75°C fault is £120-£350 including labour.

75°C High

Biasi 75°C Fault Code

Q: What does the Biasi 75°C fault code mean?

Your boiler has detected that the water inside is getting too hot and has shut down as a safety precaution.

Also written as 75C — same fault.

The Biasi 75°C fault code means: your boiler has detected that the water inside is getting too hot and has shut down as a safety precaution.. It appears on 1 Biasi model in our database.

Technical description: Excessive temperature on primary circuit

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that all radiator valves are open to ensure water can flow.Ensure your system pressure is between 1 and 1.5 bar on the pressure gauge.Restart the boiler using the reset dial to see if the fault clears.

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Biasi models that show the 75°C fault code

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

Riva Compact 24S Repair: £120-£350

Source

Biasi 75°C 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