BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Locate the filling loop (a flexible silver hose) underneath the boiler.Open the small valve(s) on the filling loop to allow water into the system.Watch the pressure gauge on the front of the boiler until the needle reaches 1.5 bar.Close the valve(s) tightly and ensure the pressure remains stable.
Your boiler has switched itself off because it has detected that the water inside has become far too hot.
Check that your radiator valves are open and not turned to zero.Ensure there is enough pressure in the system (typically between 1 and 1.5 bar).Turn the selector switch to the reset position for five seconds and then back to 'onn'.
Your boiler has detected that water is not moving through the system properly, which is causing it to overheat and shut down for safety.
Check that your system pressure is between 1 and 1.5 bar on the gaugeEnsure all radiator valves and isolation valves under the boiler are fully openBleed all radiators to remove trapped air pockets
Your boiler has tried to light several times but has failed, which means the flame is either not starting or not staying on.
Check if other gas appliances, like a hob, are working to confirm gas supply.Verify that your gas meter has credit or that the isolation valve is open.Perform a reset by turning the selector knob to the 'R' position for five seconds.Ensure the external condensate pipe has not frozen during cold weather.
Your boiler has lost its connection to the gas supply or cannot detect gas flow, meaning it cannot ignite to provide heating or hot water.
Check if other gas appliances, like a cooker or hob, are working correctly.Ensure your gas emergency control valve (usually located by your meter) is in the open position.Check if your prepayment gas meter has sufficient credit.Press and hold the 'Reset' button for five seconds to see if the error clears.
Your boiler has detected that it is overheating and has automatically switched itself off to prevent any damage or safety hazards.
Full guide for E110on the Baxi Duo-tec Combi GA
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 Baxi 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