How much does it cost to fix boiler error code 11.?

Typical repair cost for the boiler 11. fault is £250-450 including labour.

11. High

Boiler Fault Code 11.

Also written as 11 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 11. appears across 2 boiler brands and 4 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 system has encountered an internal error and cannot safely operate your heating or hot water, meaning the unit has shut down. (As reported on Saunier Duval Ecosy)

Pick your boiler brand for the 11. fix

Biasi 11. 2 models Saunier Duval 11. 2 models

Source

Information for the 11. 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