BoilerFaultCodesThe 6 most common faults
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Ensure all radiator valves are fully open to allow water to flow.Check that your system pressure is between 1 and 1.5 bar on the pressure gauge.Wait for the boiler to cool down and then press the 'Reset' button for five seconds.
Your boiler has stopped working because the water pressure in the system has dropped too low.
Locate the filling loop (usually blue-handled levers) underneath the boiler.Slowly open both taps until you hear water entering and see the pressure gauge rise.Close both taps tightly once the needle reaches between 1.0 and 1.5 bar.
Your boiler has detected that hot water isn't moving through the system properly, which usually means it is overheating and has shut down as a safety precaution.
Check if any radiator valves are turned off and open them fully.Ensure the boiler pressure is between 1.0 and 1.5 bar on the pressure gauge.Try resetting the boiler to see if the fault clears after a brief cooling down period.
Your boiler is failing to light the gas or stay lit, meaning your heating and hot water have stopped working.
Check your gas meter to ensure the valve is open and you have credit.Try turning on another gas appliance like a hob to see if the gas supply is active.Press and hold the 'R' or 'Reset' button for five seconds.In winter, check if the white plastic condensate pipe outside has frozen and thaw it with warm water if necessary.
Your boiler has detected that water is not circulating correctly through the system before the burner ignites, often due to a blockage or trapped air.
Check that all radiator valves and boiler isolation valves are fully openGently bleed your radiators to remove any trapped air pocketsCheck the boiler pressure gauge and top it up to 1.5 bar if it is too low
Your boiler's temperature sensor for the heating system has developed a fault, meaning the boiler can no longer monitor how hot the water is.
Full guide for E20on the Baxi Platinum 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 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