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Ok I was feeling brave (and tight) so decided to do it myself. I got the suspect MCB out from the upstairs lighting circuit and swapped it on to the downstairs lighting circuit. Hurrah - it didn't work, so definitely a fault on the MCB. Then swapped it back and put the power back on. With...

Thanks for the quick reply, sounds like a job for a sparky to me!

I am having the same problem (ie. I can physically reset the MCB in that the switch stays 'up' but no power is restored). I assume the MCB is broken. How do I replace? CU is a Memera 2000 but I looked on their website and no manual is available for download. Thanks, Mike...