How much does it cost to fix Biasi error code Er 02?

Typical repair cost for the Biasi Er 02 fault is £100-280 including labour.

Er 02 High

Biasi Er 02 Fault Code

Q: What does the Biasi Er 02 fault code mean?

Your boiler has switched itself off because it has detected that the water inside has become or is becoming too hot.

Also written as ER02 — same fault.

The Biasi Er 02 fault code means: your boiler has switched itself off because it has detected that the water inside has become or is becoming too hot.. It appears on 1 Biasi model in our database.

Technical description: Safety thermostat intervention lockout

Typical repair cost £100-280 (including labour)

DIY fix possible

Ensure all radiator valves are fully open to allow water to circulateCheck that the boiler pressure is between 1.0 and 1.5 bar on the gaugePress and hold the 'Reset' button for five seconds to restart the system

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Biasi models that show the Er 02 fault code

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

Advance 25C Repair: £100-280

Source

Biasi Er 02 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