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Vaillant boiler problem?

I dont know the model however when the switch is turned to central heating and hot water it works but when it is on hot water only, it doesn't work.

Anglondon
January 2009
VaillantHeating, Home Heating SystemsCentral Heating Boiler Vaillant

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Vaillant 242EVaillant 824/2EVaillant 837Vaillant combiVaillant combi boilerVaillant eco PLUSVaillant eco tec proVaillant ecoMAXVaillant ecoMAX 824Vaillant Ecomax 824EVaillant ecomax 828/2eVaillant Ecotec Plus 428Vaillant ecoTEC plus 832Vaillant thermocompactVaillant Turbomax 242Vaillant turbomax plusVaillant VCWVaillant VCW T3WVaillant VUW GB 242EVaillant VUW242E

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