What the manual says
Manufacturer manualComponent test mode. Appliance is running the manual component test as activated in the menus.
From this model's manual
Verified against the Worcester Bosch Greenstar I installation & service manual, page 37.
DIY fix possible
Locate the manual/reset button or menu settings on your boiler control panelExit or cancel the 'Component Test' or 'Installation' menuRestart the boiler to return it to normal operating mode
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