BoilerFaultCodesThe 6 most common faults
01
2.02 High Engineer
Your boiler has detected a safety-related issue with its internal sensors or temperature controls, causing it to lock out for safety.
Full guide for 2.0202
2.91 High Engineer
Your Biasi boiler has detected an internal electronic or electrical detection fault, causing it to lock out for safety.
Full guide for 2.9103
2.81 High Engineer
Your boiler has detected an issue with the air pressure or airflow sensor, which stops the boiler from safely igniting.
Full guide for 2.8104
17 High Engineer
Your boiler has detected an internal electronic or parameter setting error and has stopped operating to protect itself.
Full guide for 1705
2.61 High Engineer
Your boiler has detected a temperature problem related to the domestic hot water or heating sensor, causing it to lock out for safety.
Full guide for 2.6106
5.51 High Engineer
Your boiler has detected an issue with the heating system's return water sensor or temperature monitoring, causing it to temporarily stop operating to protect itself.
Full guide for 5.51on the Biasi Riva Compact HE M96.28SM/C
NTC thermistorMain PCBPrinted Circuit Board (PCB)Wiring harnessFlame sensor electrodeAir pressure switch
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Biasi shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue