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Mend Vaillant Ecomax Boiler

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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Other models...

Vaillant 824 EVaillant 828Vaillant ecomax 828/2 EVaillant M30100Vaillant Turbo Max VUW 242/1EVaillant TurboMAX Plus 242iVaillant turbomax plus 824Vaillant VCW 242Vaillant VCW 242/282 EBVaillant VCW 282Vaillant VCW GB 242E/282EVaillant VCWGB221

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