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Mend Vaillant VUW GB 242-5 Turbomax Error

what code 5.1 means on vaillant turbomax vuw gb 242-5 boiler?

my boiler plays up on running my hot water, the info button lights up and upon pressing it the code 5.1 comes up.plus when i run a hot tap the code 5.10 comes up? i do not have an instruction manual so am unable to work out what this means! i am very pratical minded so is slightly irritating me as to what is wrong. any help please
dan

Dan
September 2007
go to vaillant web site download instructions
its S.1 = fan is running & S10= water demarnd

kris
September 2007

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