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 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 pressure is either too low or the sensor that monitors it is not working correctly, causing the system to shut down for safety.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is below 1 bar, use the filling loop valves underneath the boiler to carefully top up the water level.Once the pressure is corrected, press the 'Reset' button on the boiler control panel.
Your boiler has detected a blockage in the condensation drainage pipe or a fault with its internal sensing system, causing it to shut down for safety.
Check the white plastic pipe leading from the boiler to the outside for signs of freezing or blockages.If frozen, gently pour warm (not boiling) water over the external section of the pipe to melt the ice.Reset the boiler by turning the control knob to the 'R' position for a few seconds.
Your boiler has detected that water isn't moving through the system properly or there is a lack of water, causing it to overheat and lock itself for protection.
Check the pressure gauge and top it up to 1.5 bar if it is lowEnsure all radiator valves and isolation valves under the boiler are fully openCheck for any visible leaks around the pipework or radiators
on the Biasi Advance 25C
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