How much does it cost to fix boiler error code Fault 02 / 42?

Typical repair cost for the boiler Fault 02 / 42 fault is £90-180 including labour.

Fault 02 / 42 High

Boiler Fault Code Fault 02 / 42

Also written as FAULT0242 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Fault 02 / 42 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's main control chip is not making a proper connection, meaning the 'brain' of the appliance cannot communicate correctly. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the Fault 02 / 42 fix

Worcester Bosch Fault 02 / 42 1 model

Source

Information for the Fault 02 / 42 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