BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light the gas or cannot detect the flame, meaning you have no heating or hot water until it is reset or repaired.
Check if your gas supply is active and other gas appliances are workingCheck if you have credit on your prepayment gas meterPress and hold the Reset button for 5 seconds to attempt a restart
Your boiler has shut itself down because it has become too hot to operate safely.
Check that all radiator valves are fully open to allow water flow.Verify that the boiler pressure is between 1.0 and 1.5 bar on the gauge.Press and hold the 'R' reset button for 5 seconds to see if the fault clears.
Your boiler has detected that water isn't moving through the system quickly enough, causing it to overheat and shut down for safety.
Check that the boiler pressure is between 1.0 and 1.5 bar on the gaugeEnsure all radiator valves and the boiler's isolation valves are fully openBleed all radiators to remove trapped air that could be blocking flow
Your boiler has stopped working because water is not moving through the system quickly enough to prevent it from overheating.
Check that the boiler pressure is between 1 and 1.5 bar on the gaugeEnsure all radiator valves and isolation valves under the boiler are fully openTry resetting the boiler to see if the error clears
Your boiler has shut down because the internal water temperature has become too hot for safe operation.
Ensure all radiator valves are fully open to allow water to circulateCheck that the boiler pressure is between 1.0 and 1.5 bar on the gaugeWait for the boiler to cool down and press the reset button
Your boiler's computer has encountered a software glitch or internal communication error and cannot start correctly.
Locate the reset button on the control panel.Press and hold the reset button for 5 seconds.Wait for the boiler to restart; if the code returns, a professional is required.
on the Biasi Basica Combi
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