BoilerFaultCodesThe 6 most common faults
01
E01 High DIY-safe
Your boiler has failed to light the gas flame and has locked itself out for safety.
What to try first
Check that your gas supply is turned on and other gas appliances are working.Press and hold the Reset button for 2 seconds then release.Wait for the boiler to attempt to restart; repeat up to three times if it fails.
02
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 2.0203
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 2.9104
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 2.8105
17 High Engineer
Your boiler has detected an internal electronic or parameter setting error and has stopped operating to protect itself.
Full guide for 1706
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 2.61on the Biasi Riva Compact HE M96.24SM/C
Ignition ElectrodeGas ValvePrinted Circuit Board (PCB)NTC thermistorMain PCBWiring harness
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