How much does it cost to fix boiler error code 4-F1?

Typical repair cost for the boiler 4-F1 fault is £0-120 including labour.

4-F1 High

Boiler Fault Code 4-F1

Also written as 4F1 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 4-F1 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 has experienced a memory or software error and needs to be restarted to restore its original settings. (As reported on Worcester Bosch Greenstar 2000)

Pick your boiler brand for the 4-F1 fix

Worcester Bosch 4-F1 1 model

Source

Information for the 4-F1 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