BoilerFaultCodesThe 6 most common faults
Your boiler has tried to light several times but failed, so it has shut itself down for safety.
Check if other gas appliances, like your hob, are working to ensure fuel is reaching the houseEnsure your gas meter hasn't run out of credit or been turned offPress and hold the 'Reset' button for five seconds to see if the boiler restarts
Your boiler has switched itself off because it has detected that the water inside has become or is becoming too hot.
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 gaugePress and hold the 'Reset' button for five seconds to restart the system
Your boiler has stopped working because it cannot detect enough water or water flow inside its main heating pipes.
Check your boiler pressure gauge to see if it has dropped below 1 bar.Use the filling loop underneath the boiler to top up the pressure to between 1 and 1.5 bars.Reset the boiler using the reset button or dial.
Your boiler has detected that there is either not enough water in the system or the water isn't moving through the pipes correctly.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop underneath the boiler to top it up with water.Ensure all radiator valves and isolation valves under the boiler are fully open.
Your boiler has detected that there is not enough water circulating inside the system to operate safely.
Check your boiler's pressure gauge on the front panel; it should be between 1 and 1.5 bar.If the pressure is below 1 bar, locate the filling loop (usually a silver braided hose under the boiler).Open the valves to allow water into the system until the gauge reaches 1.5 bar, then securely close the valves.
Your boiler has detected that there is not enough water circulating inside the system to heat your home or provide hot water safely.
Check your boiler's pressure gauge on the front panel; if it is below 1.0 bar, your system needs to be repressurised.Locate the filling loop (a silver flexible hose) underneath the boiler and open the valves to let water in until the needle reaches 1.5 bar.Close the filling loop valves tightly and check for any visible leaks around the radiators or pipes.
on the Biasi Activ A
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