I have a bosch Vario Perfect waq284d0gb, it has been working perfectly for about four years but has now started tripping the mains RCD. It doesn't trip as soon as it is plugged in but when the programmer is moved it trips immediately. At first I thought it was the mains filter so i replaced that. It worked perfectly for two days but now it is back to tripping the mains RCD again. The wiring looks in really good condition, no signs of water ingress, leaks or corrosion. I have tried plugging it into a different socket (& RCD) but i still have the same issue. I am thinking that it could be the encoder or a short on one of the boards. I am assuming that the water valve/pump, heater element and motor won't have power until the program is started? Any help would be very much appreciated.