BoilerFaultCodesWhat the manual says
Manufacturer manualReset button pressed by mistake. Press reset button again.
From this model's manual
Verified against the Worcester Bosch Greenstar I installation & service manual.
What causes this fault?
This fault occurs when the boiler's control board detects that the reset button has been held down for more than 15 seconds. It is usually caused by a user accidentally leaning on the button or pressing it for too long while trying to clear a previous error. This puts the software into a temporary state of confusion, causing it to shut down as a safety precaution.
DIY fix possible
Press the reset button briefly (less than one second).Wait for the display to clear and the boiler to restart.Ensure no other fault codes are appearing once the 'Fd' clears.
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