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

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

345 EF High

Worcester Bosch 345 EF Fault Code

Q: What does the Worcester Bosch 345 EF fault code mean?

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.

Also written as 345EF — same fault.

The Worcester Bosch 345 EF fault code means: 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.. It appears on 2 Worcester Bosch models in our database.

Technical description: Supply and/or return temperatures do not change after burner start

Typical repair cost £180-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the 345 EF fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch 345 EF fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026