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I haven't read through this thread in detail, but I've seen that the immersion heater isn't working properly.
The lighting circuit fault could be a N - E fault (if I've skimmed that bit correctly), is on the same RCD as the immersion, and immersion heaters are prime candidates for having faults to earth.
Has anyone tried switching off the immersion heater at its double pole isolator.
The lighting circuit fault could be a N - E fault (if I've skimmed that bit correctly), is on the same RCD as the immersion, and immersion heaters are prime candidates for having faults to earth.
Has anyone tried switching off the immersion heater at its double pole isolator.