How much does it cost to fix Worcester Bosch error code b2, b3, b4, b5,b6?

Typical repair cost for the Worcester Bosch b2, b3, b4, b5,b6 fault is £250-£550 including labour.

b2, b3, b4, b5,b6 High

Worcester Bosch b2, b3, b4, b5,b6 Fault Code

Q: What does the Worcester Bosch b2, b3, b4, b5,b6 fault code mean?

Your boiler's internal computer has encountered a data corruption or communication error, preventing the system from running safely.

Also written as B2B3B4B5B6 — same fault.

The Worcester Bosch b2, b3, b4, b5,b6 fault code means: your boiler's internal computer has encountered a data corruption or communication error, preventing the system from running safely.. It appears on 2 Worcester Bosch models in our database.

Technical description: Data error

Typical repair cost £250-£550 (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 b2, b3, b4, b5,b6 fault code

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

Source

Worcester Bosch b2, b3, b4, b5,b6 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