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I don't think it is sparking but is just audible is there any other way to know? So if the coil has failed the resistance will be low? what should it be roughly?

Hi, thanks for reading. I have a Worcester Bosch Heatslave 20/25 fitted with an Inter B11 burner. Yesterday the whole boiler was dead including the control panel. I replaced the control panel fuse which had blown. The Control panel came back to life and the fan started and just ran and ran...