How much does it cost to fix boiler error code Fault 02 / 43?

Typical repair cost for the boiler Fault 02 / 43 fault is £120-£380 including labour.

Fault 02 / 43 High

Boiler Fault Code Fault 02 / 43

Also written as FAULT0243 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Fault 02 / 43 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 unit is confused because a small internal configuration plug has moved or is failing, causing the system to lock out for safety. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the Fault 02 / 43 fix

Worcester Bosch Fault 02 / 43 1 model

Source

Information for the Fault 02 / 43 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