BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light the gas flame or has lost its flame signal, causing it to lock out for safety.
Check that your gas supply is turned on and other gas appliances are workingPress and hold the Reset button for five secondsEnsure the condensate pipe (if external) isn't frozen in cold weather
Your boiler has likely overheated, causing a safety component to shut the system down to prevent damage.
Locate the reset button on the control panelTurn the selector dial to the 'R' position for a few seconds and then back to 'On'Check that your radiator valves are open and your boiler pressure is between 1 and 1.5 bar
Your boiler has detected low water pressure in the system, which is preventing it from heating until more water is added.
Locate the filling loop (usually two silver braided hoses) beneath the boiler.Open the valves slowly until you hear water flowing and watch the pressure gauge.Close both valves tightly once the needle reaches between 1 and 1.5 bar.
Your boiler has likely detected a circulation issue or caught air in the system, causing it to shut down to prevent overheating.
Ensure all radiator valves are fully openBleed your radiators to remove any trapped airCheck that your system pressure is topped up to between 1 and 1.5 barPress and hold the Reset button for 2 seconds
Your boiler has failed to ignite after several attempts and has locked itself out for safety.
Check that your gas supply is turned on and other gas appliances are workingTurn the selector switch to the 'R' position for a few seconds to reset the boilerWait for the boiler to restart and check if the flame stays lit
Your boiler has detected that the water pressure is too low for it to operate safely and has shut down.
Locate the filling loop (a flexible silver hose) underneath the boiler.Slowly open the tap or taps on the filling loop until you hear water entering the system.Watch the pressure gauge and close the taps when the needle reaches between 1.0 and 1.5 bar.Ensure the taps are fully closed and reset the boiler if necessary.
on the Biasi M90E 28S
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