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vaillant blowing fuses?

i have changed the fuse about 5 times. changed the pump and fan, still blowing. i have now changed the gas valve and the fuse is still blowing on the board.

Any ideas??

Freddy
freddy, August 2009
if its as soon as you call for heating or dhw disconnect fan gas valve and pump from pcb if still blowing pcb faulty

san, August 2010
you dont say what model , could be a diverter valve try disconnecting sometimes water leaks into the heads

tim, August 2009
link Click here to see other fixes for Vaillant.