How much does it cost to fix boiler error code 111?

Typical repair cost for the boiler 111 fault is £120-350 including labour.

111 High

Boiler Fault Code 111

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 111 appears across 3 boiler brands and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because the internal water temperature has become too high, often caused by a lack of water flow or a circulation error. (As reported on Atag iC28)

Pick your boiler brand for the 111 fix

Atag 111 3 models Baxi 111 8 models ECA 111 1 model

Source

Information for the 111 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