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I have a problem with the system it is working but the heating will not come on without hot water and I think it may need to be re-wired, or do I need to replace it? the pump and 3 point valve have been changed

I have tried to fit a new Immersion heater to a fortic cylinder it has 2 immersions one for boost and one for economy 7. the cylinder has a history of immersion replacements. The old immersion will not budge and there is eveidence of damage to the cylinder around the immersion (maybe...