BoilerFaultCodesThe 6 most common faults
01
Faulty air pressure sensor High Engineer
Your boiler has detected an issue with the sensor that manages internal airflow, so it has safely shut down to prevent incorrect operation.
Full guide for Faulty air pressure sensor02
Lack of burner ignition High Engineer
Your boiler is failing to light the flame needed to produce heat or hot water.
Full guide for Lack of burner ignition03
Flame detection error High Engineer
Your boiler is failing to light the fuel inside because it cannot detect a flame, causing the system to shut down for safety purposes.
Full guide for Flame detection error04
Lock-out signal lamp High Engineer
Your boiler has detected a potential safety issue and has shut itself down to prevent damage or danger.
Full guide for Lock-out signal lamp05
Lock-out signal lamp 6 High Engineer
Your boiler is trying to start but the flame is failing to ignite, causing it to shut down for safety precautions.
Full guide for Lock-out signal lamp 606
Other faults High Engineer
Your boiler has detected an internal error that requires you to look at the specific flashing light patterns on the control panel to identify the exact problem.
Full guide for Other faultson the Biasi Garda HE MK2
Air pressure switchFlue fanSilicone pressure sensing tubesIgnition electrodeGas valvePCB
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