How much does it cost to fix boiler error code 100° C?

Typical repair cost for the boiler 100° C fault is £150-300 including labour.

100° C High

Boiler Fault Code 100° C

Also written as 100C — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 100° C appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that it is running too hot and has automatically turned itself off for safety. (As reported on Ferroli Arean)

Pick your boiler brand for the 100° C fix

Ferroli 100° C 2 models

Source

Information for the 100° C 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