BoilerFaultCodesThe 6 most common faults
Your boiler is struggling to detect the water flowing through it, which is likely caused by low system pressure.
Check your boiler pressure gauge; if it is below 1 bar, find the filling loop (usually a silver braided hose under the boiler).Open the valves on the filling loop to allow water into the system until the gauge reads 1.5 bar.Close the valves tightly and restart the boiler.
Your boiler is struggling to light its burner or cannot detect that a flame has been successfully lit, preventing it from heating your water.
Check if other gas appliances, like your hob, are working to ensure gas is reaching the property.Verify that your prepaid gas meter has credit if applicable.Press and hold the 'Reset' button for five seconds to see if the boiler restarts.
Your boiler has detected that the water is getting too hot too quickly because it isn't circulating through the system properly.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barGently bleed air from your radiators using a radiator key
Your boiler has temporarily stopped working as a safety precaution and needs a manual reset to try and get going again.
Locate the reset button or turn the mode selector to the 'Reset' position on your Biasi boiler control panel.Hold the reset button down for about 2 to 5 seconds and then release it.Wait a moment to see if the boiler fires up and resumes normal operation.
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 the water is getting too hot too quickly because it isn't circulating through the system properly.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barGently bleed air from your radiators using a radiator key
on the Biasi Advance Plus
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