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the the electricity just went out and i had to put on the generator but it was momentarilary set too high and one of the mcb's in the main fuse box in the domestic house will not reset, it is stuck on tripped even with all the fuses disconnected. Is the mcb damaged and is it easy replaced?

Have a Vokera boiler on a sealed system. the gauge on the boiler reads different than the gauge at the filling point (cylinder, upstairs). I currently have a leak which I am in the process of fixing and I need to top up regurily, if the boiler is at 1 bar and will not light then I top up to 2...