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 metal hose) under the boiler.Open the valves until the pressure gauge on the front reads between 1.0 and 1.5 bar.Close the valves tightly and turn the boiler off and back on again to reset.
Your boiler has switched itself off because it has detected that the water inside is getting too hot, likely due to low water pressure or trapped air in your radiators.
Check your boiler's pressure gauge and top it up to 1.5 bar if it is below 1 barBleed all radiators in your home to release any trapped airEnsure all radiator valves are fully open to allow water to flow freely
Your boiler has detected that hot water is flowing in the wrong direction or is blocked, which usually means the system lacks enough water or has trapped air preventing a proper flow.
Check your boiler pressure gauge; if it is below 1 bar, top up the system using the filling loopBleed all radiators in the house starting from the ground floor up to the top floor to release trapped airEnsure all radiator thermostatic valves are fully open to allow water to circulate freely
Your boiler has detected that the water pressure inside the system is far too low to function safely.
Locate the filling loop (usually two silver taps connected by a braided hose) underneath the boiler.Gradually open the taps to let mains water into the heating system until the pressure gauge reads between 1.0 and 1.5 bar.Close both taps tightly and check the display to see if the error has cleared.
Your boiler is struggling to move water around your heating system effectively, which is causing it to shut down to prevent overheating.
Check your boiler display for the water pressure reading; if it is below 1.0 bar, use your filling loop to top it up to roughly 1.5 bar.Ensure all your radiator valves are fully open to allow water to circulate freely.Restart the boiler once the pressure is correct to see if the fault clears.
Your boiler is trying to start up, but it cannot successfully light the internal flame after several attempts, so it has shut down for safety.
Full guide for E01on the Remeha Avanta 28c
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 Remeha 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