Tenant reported electrical fault, MCB tripped on 11/04 first time ever in 30 years, but said washing machine was not working. It was one off, I went there but all looked good, my electrician said no need to investigate at this stage.I imagine that the machine is protected via the socket it is connected to by all the correct components in the consumer unit (mcb and rcd ) if that is so and the machine is now working fine then I would say, although it is difficult to prove without close examination, that the machine is OK. The usual fault that appears in that sort of sityuation is that the heating element absorbs moisture and causes either the mcb but more commonly the rcd to trip. You don't mention having this problem. The other concerns would be circuit boards and motor brushes both of which would probably give error codes when trying to use the washer if they were faulty. Personally if the machine is not that old I would tend to just suck it and see. As Diver fred says the only real way is for someone qualified to see it on site but I doubt they would commit themselves to giving any guarantees and be a ttime consuming and expensive thing to do.
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