BoilerFaultCodesWhat the manual says
Manufacturer manualChimney sweep demand (Operating message, is not a fault)
From this model's manual
Verified against the Worcester Bosch/Worcester Bosch 2000 Gc2000iw 2019 installation & service manual, page 79.
DIY fix possible
Locate the chimney sweep button on your boiler's control panel (often marked with a chimney icon).Press the button once to exit the testing mode.Wait for the display to return to its normal temperature reading and check if the boiler resumes standard operation.
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Related fault codes
All 144 fault codes on the 2000 GC2000iW 25 C NG
Seeing a different code? Every code this model can display, in one place.
20020120220320420721221421522422722822923223323423523723824224424524624724925025125225325425625725825926226326426526826927027327528130530632332834134235035135635735836036236336436560481081510131014101710181021102210231065106810731074107510762051208529082909291029112912291329142915291629172918292029212922292329242925292629272928293029312932294029412942294329452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692971297229732974b1C1C4C6Constant redd1d3E2Flashing red