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Cylinder / Tank also still firing when I switch just the boiler off (not from the mains)

The mains switch in the cupboard is switched off which looks attached to the immersion. Is there another part?

Thanks. Turning water to off does not fix the issue unfortunately. Tried this already. The cylinder is constantly on for 24hrs unfortunately :(

Good Day, I am wondering if you could point me in the right direction of my potential issue. Complete newbie to this and to the forum so thanks in advance for any help / guidance. Setup: 1/I have a boiler, along with timer dial in the kitchen. 2/Cylinder / Tank in hallway under stairs...