What the manual says
Manufacturer manualInternal OS error
From this model's manual
Verified against the Worcester Bosch/Worcester Bosch 2000 Gc2000iw 2019 installation & service manual, page 81.
DIY fix possible
Locate your boiler's power supply switch or plug.Switch it off and wait for 60 seconds to allow the internal memory to clear.Switch the power back on and see if the error clears itself.
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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.
20020120220320420720821221421522422722822923223323423523723824224424524624724925025125225325425625725825926326426526826927027327528130530632332834134235035135635735836036236336436560481081510131014101710181021102210231065106810731074107510762051208529082909291029112912291329142915291629172918292029212922292329242925292629272928293029312932294029412942294329452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692971297229732974b1C1C4C6Constant redd1d3E2Flashing red