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Fuses on both PCB's are tested and good. I think at this point I just need to order a new PCB and try it.

Thanks fellas, I think we're nearly there! Yesterday I got as far as working up from the burner and across the control panel and I uploaded a pic showing the voltages on the previous page, but couldn't get as far as the 2nd PCB due to rain. Today I've been able to unscrew the second PCB and...

Burner lockout light is never illuminated. It appears than no power is getting to the burner but I don't know why

Thanks everyone for your help. I've been testing more today and have uploaded a few pictures showing the voltage at certain points. Should the clear relays give a reading with the boiler switched on but burner not running? The red light is on each of them, but I may not be checking the correct...

Thanks everyone, I've tested with a multimeter and the results are very inconsistent. On the wire which runs down from the top panel down the the burner control box, I've seen anywhere between 190 to 225 volts. Sometimes its zero. Following that wire up to the connector block on the left of...

Thanks for all your help so far guys! Oilhead, the burner is a Riello RDB 2.2 and I tried the new motor and capacitor together. I called an engineer who (mis)diagnosed the fault as being the control box sitting on top of the burner. I thanked him and ordered a new control box to fit myself...

New motor received today and still no luck unfortunately. I didn't "install" it. I kept the old motor in place on the burner and just connected the new motor wires up to the control box and capacitor and when I switch it on exactly the same thing happens with the new motor. The shaft turns...

Hi everyone, I have a Grant Vortex external combi about ten years old which has caused no end of problems since installation. I've replaced quite a few parts myself over the years but I'm currently facing a problem that I'm hoping somebody will have faced and know what is causing it. The...