Vaillant 615E?

I am having problems with my bolier the whole system has gone off and we discovered the internal fuse had blown so we replaced this and it blew again. Anyone know what the problem could be? Its not the circuit board either as this has been checked???

Please help any advice would be greatly received!!
michelle todd, March 2006


done
remove power from fan, and try. if not blown its the fan. and do the same for pump.

timmo, March 2006
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