290 High

Worcester Bosch 290 Fault Code

The Worcester Bosch 290 fault code means: your boiler has detected an internal electrical communication error on its main circuit board, meaning it cannot process sensor data correctly and has stopped working to prevent further damage.. It appears on 5 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: F0 AD converter reference error
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 290 fault code

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

Source

Worcester Bosch 290 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 7 July 2026