RCD adaptor plug and CU RCD



I have an intermittent tripping with the RCD in my Consumer Unit. I think, but can't prove, its the dishwasher which is now about 5 years old and we have hard water etc.. I had thought, mistakenly I now think, that I could prove it was the dishwasher by using a plug in RCD adaptor for the dishwasher. Trouble is, now if there is a trip they both (the RCD adaptor the dishwasher is plugged in to and the main RCD in the CU). My house also has a main RCD between the meter and the CU, this rarely trips at all.

I've had a quick look through the forums but I can't see an answer explaining how I can prove 100% its the dishwasher, or the washing machine. Obviously we could stop using it, but sometimes its several week between trips and I would want the wife to ruin her hands by getting the Fairy out :) I could also plug in the dishwasher to a circuit on the non-RCD side of the CU and see if the main RCD trips, but again I wouldn't want to do this for weeks at a time.

I'm guessing that even if I get a spark in with his test equipment it would only show positive if the dishwasher had a continual earth leak, as opposed to an intermittent one caused by water on the wash/dry cycle.

Any ideas?
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18 May 2008
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United Kingdom
Main RCD is normally a 100mA trip
The one protecting sockets and the plug in ones are 30mA trips

I would look underneath for any signs of water leaking and check the bottom door seal lip is free from gunge

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