How much does it cost to fix boiler error code 345 EF?

Typical repair cost for the boiler 345 EF fault is £180-350 including labour.

345 EF High

Boiler Fault Code 345 EF

Also written as 345EF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 345 EF 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 that no heat is being transferred into your radiators or hot water pipes even though the system is trying to fire up. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the 345 EF fix

Worcester Bosch 345 EF 2 models

Source

Information for the 345 EF 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