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Why does my Ideal Response 120 boiler keep fusing?

My Ideal Response 120 boiler keeps fusing the house electrics at the mains fuse board - the CH/hot water are available for about 40 mins and then it blows. A new diaphragm water pressure switch was fitted 5 weeks ago - could this be to blame?
John S, February 2007
have you checked for any internal leaks on to pcb. or electrics

hi-spec plumbing, February 2007
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