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how can i fix vaillant ecomax combination boiler?

i have no hot water or heating the fault shows numbers f21 34 25 50 48

corrigan.m
October 2009
VaillantHeating, Home Heating SystemsVaillant Ecomax Boiler
hi i have an Vaillant ecomax 613e and it is showing code F21 please can you tell me what this code means.

Hamid
December 2009
hi, i have an Vaillant Boiler ecomax 613e and it is showing code number F21 plase can you tell me what this code means.

Thanks

Imran
December 2009

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