Tripping out RCD

I had this probem and apparently there's a 'float switch' in the bottom of the machine. This switch is a safety cut off and when activated can not just stop the machine but trip the electrics in the house. the reason for it activating is when food clogs up the drainage bit water can not drain and fills up the bottom of the machine. this then activates the 'float switch' as a kind of safety cut off.
the way to sort it is to disconect the machine from the mains and drain and water. empty the clogged up food from the drain bit. then tip the machine back and a load of water will pour out (may need a load of towels for this bit or take the machine out the back and do it)
once this is done, plug it all back in and give it a try - works for my machine, good luck.

It may be the element has a tiny hole in it somewhere, I had the same problem, and found a minute pin hole under some corrosion on the element. This was allowing the power in the element to circuit to the metal casing, and trip the RCD, but only just enough to trip it, not enough to show on my DMM. Hope this helps.