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

Typical repair cost for the boiler Enn fault is £150-450 including labour.

Enn High

Boiler Fault Code Enn

Also written as ENN — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Enn appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has encountered a critical system error and has shut itself down as a safety precaution. (As reported on Keston C55)

Pick your boiler brand for the Enn fix

Keston Enn 8 models

Source

Information for the Enn 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 27 April 2026