What the manual says
Manufacturer manualLocking fault: To unlock Hold up and down arrow keys pressed simultaneously for 3 s. (Boiler locked. Contact a qualified heating engineer)
From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Wb 47848 installation & service manual.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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All 99 fault codes on the Greenstar 8000 F
Seeing a different code? Every code this model can display, in one place.
200201202203204208214224227228229232233234235237238242244245249250251252253254257258259262263265268269273281283284305306357358360362363604815101010131017101810191021102310251037106510681070107110721075107620852908291029142915291629202923292429252926292729282931294029462948294929502951295229552956295729612962296329652966296829692970297129722981