How much does it cost to fix Worcester Bosch error code F0 278?

Typical repair cost for the Worcester Bosch F0 278 fault is £90-220 including labour.

F0 278 High

Worcester Bosch F0 278 Fault Code

Q: What does the Worcester Bosch F0 278 fault code mean?

Your boiler's internal computer is having trouble communicating with its temperature sensors, which means it cannot safely monitor the water temperature and has shut down as a precaution.

Also written as F0278 — same fault.

The Worcester Bosch F0 278 fault code means: your boiler's internal computer is having trouble communicating with its temperature sensors, which means it cannot safely monitor the water temperature and has shut down as a precaution.. It appears on 10 Worcester Bosch models in our database.

Technical description: The sensor test has failed – cabling and plug sensors need checking

Typical repair cost £90-220 (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 278 fault code

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

Source

Worcester Bosch F0 278 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