What the manual says
Manufacturer manualThree way valve kick. If the 3-way valve hasn't moved in up to 48 hours, the valve will operate once to prevent seizure.
Shared across the Greenstar 8000 range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
DIY fix possible
No action is requiredObserve the boiler display to see if the status code clearsResume normal use as this is a protective self-test routine
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Related fault codes
All 107 fault codes on the Greenstar 8000 Life Regular
Seeing a different code? Every code this model can display, in one place.
1-A21-d31-d41-E11-E21-E31-E41-EA1-Eb2002012022032042082142242272282292322332342352372382422442452462472482492502512522532542572582592622632652682692732812832843063573603623636048151010101310181019102210231025103710681070107110721075107620852908291029142915291629202923292429252926292729282931294029462948294929502951295229552956295729612962296329652965 B29662966 B296829692972D4