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hey fella's, went to look at a worcester 24i junior, not a greenstar. the initial fault was that the boiler was trying to light, pump runs, fan runs, starts to spark but no gas to light. checked gas valve (which was only fitted 2 months ago) only power going to the blue plug. checked cables for continuity etc. it didnt seem like the ignition was sparking long enough to light anything, less than a second then it would go to fail. we rang WB technical who said it indicated a pcb fault. weve changed that and still nothing but now it doesnt spark and when there is no demand, it still goes to lockout after a couple of seconds. also with demand the fan runs then it locks out. rang WB again they said it has a short somewhere. Im thinking its the fan but any other ideas before i go running to cust for more money!!