How much does it cost to fix Worcester Bosch error code F0 (242 - 256)?

Typical repair cost for the Worcester Bosch F0 (242 - 256) fault is £250-450 including labour.

F0 (242 - 256) High

Worcester Bosch F0 (242 - 256) Fault Code

Q: What does the Worcester Bosch F0 (242 - 256) fault code mean?

Your boiler's main electronic brain is failing to communicate properly, which means it has safely shut itself down to prevent further damage.

Also written as F0242256 — same fault.

The Worcester Bosch F0 (242 - 256) fault code means: your boiler's main electronic brain is failing to communicate properly, which means it has safely shut itself down to prevent further damage.. It appears on 3 Worcester Bosch models in our database.

Technical description: Control box or the HCM is defective.

Typical repair cost £250-450 (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 F0 (242 - 256) fault code

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

Source

Worcester Bosch F0 (242 - 256) 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