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By the way, transformers only work with AC. Don't go on measuring DC voltage on the secondary! Have you checked condensate trap/bottle! If all else fails replace it with a Heat Line mate, or as someone once told me Vaillant Heat-line! :cheesy:
 
Thanks for all the advice , i have done pretty much everything you have all suggested except wiring loom. I bit the bullet yesterday and told the customer to call worcester bosch and get them to have a look , anyway he has been to day thrown a load of parts on it and its still not working! Which makes me feel better ( customer not so). He is going back tomorrow cos he thinks the gas valve he fitted today is faulty ( ive already put a g v on it also ). I will post the outcome when i know
 
had a nightmare with a glowworm spacesaver mk2 40b mate pilot would not stay on when button released diagnosed gas valve replaced a few days ago - boiler been ok today get call pilot goes out now and again so the gas valve must have not been the fault I am told by customer and I have changed it for nothing even though they saw me fit a temp new thermo into old valve to eliminate it on first visit.i assume its the pilot assy that's partialy blocked now or the thermocouple lead that's no longer available that's playing up.realy got to me this wk what makes it worse is that my merchant is putting security stickers on all parts it supplies now and once the box is open they are non returnable this is on pcbs gas valves fans etc which puts more pressure on us
 
had a nightmare with a glowworm spacesaver mk2 40b mate pilot would not stay on when button released diagnosed gas valve replaced a few days ago - boiler been ok today get call pilot goes out now and again so the gas valve must have not been the fault I am told by customer and I have changed it for nothing even though they saw me fit a temp new thermo into old valve to eliminate it on first visit.i assume its the pilot assy that's partialy blocked now or the thermocouple lead that's no longer available that's playing up.realy got to me this wk what makes it worse is that my merchant is putting security stickers on all parts it supplies now and once the box is open they are non returnable this is on pcbs gas valves fans etc which puts more pressure on us

I feel your pain pal, ive ended up with a pcb, gas valve and transformer from this job. I know they will all sell at some point but it doesnt make it any better.
 

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