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The circuit boards don’t have earth wires going to them. As Dave says it could be that you have an oversensitive RCBO, but as you say that you’ve moved it to another circuit and that also trips then I’d be looking towards a chafed through wire touching the earthed case or something similar. Yes the white boxes are relays but again they have no Earth connection. You could try lifting the PCBs from their mounting Pilar’s one at a time just to make sure that nothing is tracking to Earth.
Where the outlet from the dishwasher connects to the sink waste, did you remove the blanking plug before connecting the outlet pipe ?.
Ok, so unfortunately it seems that your now at the stage where you need to have a multimeter and know how to use it or look at calling in a professional to help you.
Hi: As above an RCD detects earth fault current, An RCBO will detect earth fault current and also Overcurrent in the Live / Neutral circuit.
From your original description it appeared that the circuit breaker did trip when the elements were activated as you said everything was ok until you turned the selector switch on.From the description it’s an RCBO rather than an RCD. So it serves both functions: Overcurrent and Earth leakage protection, agreed it’s much more likely to be an element at fault.
The inlet would include the isolation valve: Is water getting through it, the pipe to the machine: Same again. The inlet valve: Is it getting power, is the coil open circuit, is water getting through the valve when energised etc.
