BoilerFaultCodesRavenheat E08 Fault Code
The Ravenheat E08 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.. It appears on 2 Ravenheat models in our database.
Technical description: Pressure is nil/too low
DIY fix possible
Locate the external filling loop, which is a silver braided hose with one or two valves underneath the boiler.Slowly open the valve(s) to allow mains water into the system while watching the pressure gauge on the front of the boiler.Stop filling once the needle reaches the green zone, typically between 1.0 and 1.5 bar, and ensure the valves are fully closed.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like E08: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Ravenheat models that show the E08 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat E08 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 31 August 2026