BoilerFaultCodesThe 4 most common faults
Your boiler has detected that there is not enough water in the system to operate safely.
Why it happens: This fault occurs when the internal pressure sensor detects that the system water level has dropped below the minimum safety threshold. The most common reason is a small leak in the pipework or radiators, though it can also happen if the expansion vessel has lost its air charge or the pressure sensor itself has failed.
Locate the filling loop (usually a silver flexible hose) underneath the boiler.Slowly open the one or two taps/valves on the filling loop until you hear water entering.Watch the pressure gauge and close the valves once the needle reaches between 1 and 1.5 bar.
Your boiler has detected that there is not enough water in the system to operate safely, which has caused it to shut down.
Locate the filling loop (usually a silver braided hose) underneath the boiler.Open the small valve or valves on the loop slowly until you hear water entering.Watch the pressure gauge until it reaches between 1 and 1.5 bar, then close the valves tightly.
Your boiler has stopped working because it cannot light the internal flame or keep it burning.
Full guide for E01Your boiler has detected that the temperature inside the unit is very low and has briefly activated its internal heater to prevent the pipes from freezing.
Full guide for AFon the Ravenheat HE 80/90 / 25-30s
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 Ravenheat 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