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  1. M

    immersion heater/FCU

    Hi, I'm new to this so please bear with me. In my airing cupboard is a switched 13a FCU with red neon. This is connected to a 3kw immersion heater. When the fcu is switched off The red neon glows ie is lit dimly but not at full brightness. When the fcu is switched on the neon lights up as...
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