BoilerFaultCodesRavenheat E8 Fault Code
The Ravenheat E8 fault code means: your boiler has stopped working because the internal water pressure has dropped too low to operate safely.. It appears on 1 Ravenheat model in our database.
Technical description: Pressure nil/too low
DIY fix possible
Locate the filling loop (a flexible metal hose with one or two valves) underneath the boiler.Open the valve(s) slowly to allow cold mains water into the system.Watch the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close the valve(s) tightly and ensure no water is leaking from the connection.
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Ravenheat models that show the E8 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat E8 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 7 July 2026