How much does it cost to fix boiler error code Fault 40 101?

Typical repair cost for the boiler Fault 40 101 fault is £90-160 including labour.

Fault 40 101 High

Boiler Fault Code Fault 40 101

Also written as FAULT40101 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Fault 40 101 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 an electrical fault with its main temperature sensor, causing the system to shut down safely to prevent overheating. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the Fault 40 101 fix

Worcester Bosch Fault 40 101 2 models

Source

Information for the Fault 40 101 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