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

Typical repair cost for the boiler 100 fault is £120-250 including labour.

100 Medium

Boiler Fault Code 100

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

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

Most common meaning Your boiler is displaying a status code related to its internal heat output settings rather than a functional fault, indicating it may not be configured correctly for your home's setup. (As reported on Worcester Bosch 537i)

Pick your boiler brand for the 100 fix

Worcester Bosch 100 1 model

Source

Information for the 100 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