You can test the coil with a multimeter, it should read 1.4 ohms between brown and blue wire and 1.4 kohm between blue and black wire.
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Are the electrodes cracked or have the correct gap settings
I gained 11.2% which I'm happy with the next I ever want to be there will be when I'll replace with a newboiler. Lol
Thanks for all your help! Can't express how much you guys have pushed my ability more than any books I could ever Reid. So cheers