How much does it cost to fix boiler error code E25?

Typical repair cost for the boiler E25 fault is £200-400 including labour.

E25 High

Boiler Fault Code E25

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E25 appears across 4 boiler brands and 15 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's computer is having trouble reading its own internal memory, which means it cannot safely control its operations. (As reported on Vokera Condexa Pro)

Pick your boiler brand for the E25 fix

Ariston E25 2 models Biasi E25 7 models Keston E25 4 models Vokera E25 2 models

Source

Information for the E25 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026