Medium
267 on Worcester Bosch Greenstar 12i System

Your boiler's internal computer has crashed and needs to be restarted to resume normal operation.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

F0 Watchdog time-out error

From this model's manual
Verified against the Worcester Bosch Greenstar 12i System installation & service manual, page 63.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Locate the reset button on the front control panel of your boilerPress and hold the reset button for 3 to 5 secondsWait for the boiler to complete its automatic restart sequence and monitor if the fault code clears

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