BoilerFaultCodesVokera E25 Fault Code
The Vokera E25 fault code means: your boiler has shut down because it has detected an internal safety issue, likely related to overheating or a lack of water circulation.. It appears on 2 Vokera models in our database.
Technical description: The safety devices have been activated (lockout)
What causes the Vokera E25 fault?
This fault occurs when the boiler's internal sensors detect that the water temperature has risen too quickly or peaked beyond safe limits. The most common reason is a failure in the circulation pump or a blockage in the heat exchanger, preventing heat from being moved away from the burner. It can also be triggered if there is air trapped in the system or if the water pressure has dropped too low to function.
This issue often surfaces during the first cold spell of autumn when a pump that has been idle all summer fails to restart correctly.
DIY fix possible
Check if the system water pressure is between 1 and 1.5 bar on the pressure gaugeIf the pressure is low, use the filling loop to top it up to the correct levelAttempt to reset the boiler by turning the selector switch to the reset position and back
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Gas Safe Register →Vokera models that show the E25 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E25 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026