BoilerFaultCodesVokera E 25 Fault Code
Also written as E25 — same fault.
The Vokera E 25 fault code means: your boiler has sensed that the water inside is heating up far too quickly and has shut itself down to prevent damage.. It appears on 1 Vokera model in our database.
Technical description: Excessive temperature rise
What causes the Vokera E 25 fault?
This fault occurs because the water inside the boiler is getting too hot too quickly, often because something is blocking the flow or the pump has failed. The most common reasons include a buildup of internal debris like lime scale or sludge, or a mechanical failure that prevents the water from circulating around your radiators.
This fault is frequently seen in autumn when heating systems are switched back on after a long summer break, as pumps can seize up during periods of inactivity.
DIY fix possible
Check if your radiator valves are openEnsure the system water pressure is between 1 and 1.5 barGently bleed your radiators to remove trapped air
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Gas Safe Register →Vokera models that show the E 25 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E 25 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