How much does it cost to fix Worcester Bosch error code 315?

Typical repair cost for the Worcester Bosch 315 fault is £150-300 including labour.

315 High

Worcester Bosch 315 Fault Code

Q: What does the Worcester Bosch 315 fault code mean?

Your boiler is struggling to detect the water flowing through its internal pipes, which is causing it to stop heating as a safety precaution.

The Worcester Bosch 315 fault code means: your boiler is struggling to detect the water flowing through its internal pipes, which is causing it to stop heating as a safety precaution.. It appears on 2 Worcester Bosch models in our database.

Technical description: Several times lack of water flow

Typical repair cost £150-300 (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 315 fault code

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

Source

Worcester Bosch 315 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