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Been reading through lots of threads concerning these combis but cant find any answer to what I am looking for. I have always had it set at just over 1 bar when its standing , but today I had to bleed the rads and then went to top it up as the pressure had dropped. As I was topping up my hand...

I have just taken down a light fitting in the house and as I removed it the red tape on the black switch wire fell off (age I guess). I have a tester here that looks like a screw driver that lights up when you touch wires. Can I use this if I turn on the power and touch the black coating on...