Got an RCD issue I could do with some advice on please.
RCD covers 3 circuits, upstairs lights, upstairs sockets and downstairs . It is tripping on downstairs sockets; even with all devices unplugged. Tends to stay OK for about 20 minutes; when you reset it, sometimes takes two or three attempts before it stays connected. When I switch the downstairs sockets out, no problems. I've run one of those little 3-pin socket testers round all the sockets and they're coming up good. My money's on a faulty circuit breaker but i'd welcome any sensible advice.
Note; not planning to dig too deep myself, merely trying to cut the diagnostics fee down a bit!
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