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I was recently working on a friends new (old) house lighting circuit, changing a light switch. I isolated the lighting circuit, tested for voltage at the switch, circuit was dead. I removed the switch circuit, then removed the earth, when I received a shock from the earth!!!!! :shock...

I have a problem with the Central heating and water not getting hot. System: Gravity feed system, with H configuration and 3-port valve, Baxi Boiler, no drain off points except from radiator. No pressure gauge. No flling loop. History: System has worked fine for past three years, when I...