BoilerFaultCodesRavenheat 08E Fault Code
The Ravenheat 08E fault code means: your boiler has detected that there is not enough water in the system to operate safely.. It appears on 7 Ravenheat models in our database.
Technical description: Low water pressure
What causes the Ravenheat 08E fault?
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.
This issue often surfaces at the start of autumn when homeowners turn their heating back on after a long summer break, exposing small leaks or pressure drops.
DIY fix possible
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.
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Gas Safe Register →Ravenheat models that show the 08E fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat 08E fault code information on this page is sourced and cross-checked against the official Ravenheat service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026