BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light the flame or has lost it during operation, causing the system to lock out for safety.
Check that your gas supply is turned on and other gas appliances are working.Press and hold the 'Reset' button for five seconds to see if the boiler restarts.If it has been very cold, check that the white plastic condensate pipe outside hasn't frozen.
Your boiler has likely overheated, causing a safety cutout to stop the system from running.
Turn the selector switch to the 'Reset' position for a few seconds, then back to the 'On' position.Check that your radiator valves are open and not turned off.Ensure your boiler pressure is between 1 and 1.5 bar on the pressure gauge.
Your boiler has detected a problem with how it disposes of waste gases or brings in fresh air, causing it to shut down for safety.
Check the outdoor flue pipe for any obvious obstructions like bird nests, leaves, or debris.If it is freezing outside, check if the white plastic condensate pipe is blocked with ice.Press and hold the reset button for 5 seconds to see if the error clears.
Your boiler has detected that the water pressure is too low, causing the system to shut down for safety.
Locate the filling loop (braided silver hose) underneath the boilerSlowly open both taps/valves until you hear water entering the systemClose both valves once the pressure gauge on the front reaches between 1.0 and 1.5 barPress the Reset button
Your boiler has likely detected a circulation or temperature sensing issue, meaning the water is either not moving correctly or the boiler thinks it is overheating.
Check that the boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and isolation valves under the boiler are fully openTry bleeding your radiators to remove any trapped airPress and hold the Reset button for 5 seconds
Your boiler has detected an electrical configuration error and cannot operate safely, meaning you will have no heating or hot water until it is reset or repaired.
Locate the selector switch on the front control panelTurn the dial to the 'R' (Reset) position for five secondsTurn the dial back to the 'On' position and wait for the boiler to restart
on the Biasi Parva 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