High
No functions on Worcester Bosch Greenstar i

Your boiler has lost all power and the display is completely blank because of an internal electrical failure.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

230V fuse (S11). Transformer. Otherwise replace control board.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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