How much does it cost to fix boiler error code A11?

Typical repair cost for the boiler A11 fault is £100-£180 including labour.

A11 High

Boiler Fault Code A11

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code A11 appears across 3 boiler brands and 13 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it can no longer accurately measure the temperature of the water coming back from your radiators. (As reported on Ferroli Bluehelix Tech)

Pick your boiler brand for the A11 fix

Ariston A11 9 models Ferroli A11 3 models Vokera A11 1 model

Source

Information for the A11 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