BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light the flame or has lost its flame during operation, causing it to shut down for safety.
Check if your gas supply is active by testing another gas appliance like a hobPress and hold the 'Reset' button for five secondsEnsure the condensate pipe (outside white plastic pipe) isn't frozen if it is winter
Your boiler has likely overheated, causing its safety system to shut it down to prevent damage.
Check that your radiator valves are open and not turned off.Ensure there is enough water pressure in the system (between 1.0 and 1.5 bar).Press and hold the 'Reset' button for 5 seconds to restart the boiler.
Your boiler has detected low water pressure in the system, which is preventing it from firing up to provide heat or hot water.
Locate the filling loop (the flexible silver hose) underneath the boiler.Slowly open the one or two small valves on the hose until you hear water entering the system.Watch the pressure gauge and close the valves once the needle reaches between 1 and 1.5 bar.Turn the selector switch to 'Reset' for a few seconds to clear the fault code.
Your boiler has stopped working because it has detected a specific internal electrical fault or a sensor communication error that requires a manual reset.
Locate the selector switch on the front control panelTurn the switch to the 'Reset' position for 5 to 10 secondsTurn the switch back to the 'On' (Heating or Hot Water) position and wait for the boiler to restart
Your boiler has likely detected a circulation or temperature issue that has caused it to lock out for safety.
Locate the selector switch on the front panel and turn it to the 'R' position for 5 seconds, then back to the on position.Check that your system pressure is between 1.0 and 1.5 bar on the pressure gauge.Ensure all radiator valves and isolation valves are fully open to allow water to flow.
Your boiler has failed to ignite after several attempts, meaning it cannot produce heat or hot water.
Check if other gas appliances in your home, like a hob, are working to ensure gas supply is active.Verify that your prepaid gas meter has credit, if applicable.Turn the control knob to the 'R' position for a few seconds to reset the boiler.If the boiler was recently serviced, ensure the gas isolation valve under the boiler is fully open.
on the Biasi Riva Compact 24S
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