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vaillant boiler trips house electrics when hot tap on?

When i put hot tap on or fire up the heating the main rcd trips on the fuse board.any ideas
steve.r, August 2012
Depends on which Vaillant, but in general, a faulty large motor will trip an rcd. Suspect pump and fan initially.

Carefree, August 2012
link Click here to see other fixes for Vaillant.