Bosch dishwasher trips rcd

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Morning all, I have a bosch avantixx scs45a02gb/36. Its always worked fine then suddenly mid load, tripped the main rcd. I reset and it tripped again straight away. I turned the washer off at the plug, reset OK, turned the washer plug back on on, the machine clicked and tripped again.
This time I opened the washer door, reset the rcd, turned the plug on, all lights came on the front of the door as normal, as soon as I closed the door, click from the machine and rcd tripped again.
I've tried in different sockets too so it's not the socket.

Any advice greatly received
 
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Having read loads of the posts on here and else where it doesn't sound like heater element as most people say theirs trips when heating, mine as soon as the door shuts trips even when on the cold pre wash
 
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as the door shuts

some wires pass from the machine into the bottom of the door. If you remove the inside lining from the door, you will see them. They flex when the door moves.

over time, the insulation, or the core, may crack, break or come loose or be pinched.

You can also look for water getting inside the door, when you take the panel off.
 
OK, so I've taken all the panels off, all wires seem to be intact with no signs of breakage or wear. Also no sign of any leaks from the seals going and water getting into the electrics.
I have noticed that if I leave the on switch 'on' with the door shut and turn the plug back on, there is a double click from the machine prior to the rcd tripping.
 
I suppose it might be relevant, then, that there is a cutout which prevents pump, valves or heater running when the door is open. Maybe the safety latch turns something on when you shut the door. Have you pulled it out and looked underneath? If it has been leaking, there is probably a basin to catch the water, and it will spill out when you tilt the machine backwards (don't tilt it forwards as water may get into the door, which is full of electrics).

There are IIRC connection plugs on the pump and heater.

The electric water valve is inside the casing on the left wall as you look at it.
 
Thanks John,

So tipped and still no leak, had a good look around and no water coming from anywhere.

Decided to try isolating different parts to see if I could stop the trip that way and after a couple of different tries, I disconnected the supply to the thermostat at the top of the heater and the machine has managed to run an entire cycle without a trip all though it was cold.

Is it likely that its just the stat or the entire heater? Why would this trip an rcd?
 
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it's usually the heater. The electrical element is encased in a metallic sheath, to keep water out and to isolate the electrical parts. With age the sheath deteriorates and damp can enter. Usually the trip occurs during a heating cycle, but a neutral-to-earth fault will also cause a trip, depending on other loads in the house. Many electrical products only isolate the L connection, not the N, and your thermostat may do that. Though products designed for use in continental Europe are often dual-pole as traditionally two-pin plugs have been used. If you can seperate and test the thermostat try that, as it might be a cheaper repair.

p.s. you seem to have unplugged the blue conection, which I'd think is more likely to be the N than the red one.
 

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