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vaillant boiler?

my old vaillant boiler doesnot want to fire up when hot tap is opened

fritz
June 2008
VaillantHeating, Home Heating SystemsBoiler Heating Vaillant
assuming it fires ok for c/h, then the flow switch for dhw needs cleaning / replacing or your sytem may be scaled / sludged up and need cleaning....

T
June 2008

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