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have you checked to see if the white and black (or hot) wires are reversed.
It is very common to have this problem.
some plug wires have a smooth edge and a rippled side, one wire per side and the ground wire is green or in the middle.
if there is a side that has a rippled edge make sure that it is on the black wire of the dishwasher and the white to the smooth side.
I remember this in this way: if i hook the power side to an oscilloscope it would show a wave pattern and if I do the same with the common or white wire then it is smooth a straight line
The Black wire is the Hot or positive wire and the White wire is the nuetral or negative wire.
The green wire gets hooked to the frame or any metal part of the dishwasher...usually there is a green screw inside the little box where the wires hook up
The black and white wires supply power to the motor so that it rotates clockwise when the machine is in it's wash cycle. The blue and red wires are opposite to the black and white. This makes the motor spin counter clockwise. The machine will be in it's drain mode mode when the blue and red wires are live.
there should only be two or three wires main wires brown & blue or red & black. green or green with yellow stripes is earth wire main wires connect to pump motor earth connects to earth point hope this helps
When you say connect, I assume you mean you are installing or reinstalling a dishwasher. With the power off, you always connect the black wire with the black wire on the dihswasher. This is the HOT or the LINE wire. The white wire hooks to the white which is the COMMON wire, and the bare copper wire connects to the green screw or green wire and is the GROUND. If you are using a pig tail (plug in connection) the common wire will usually have a line or series of lines going the length of the wire. Just be sure you identify the correct wire because a dishwasher will run with the hot and the common connected backwards which can create a dangerous situation if a short develops inside the dishwasher. Use wire nuts twisted on snugly and enclose all wiring connections in the connection box. Hope this helps! Ken
If you have a volt/ohm meter you can check for Power on the Blue wire. Or you can open the face of your fuse box and look to make sure the Blue wire is connected to the fuse. If it is, just hook up your Black from dishwasher to the blue from house. White to White ( Neutral). There is no real way to ground the dishwasher if your house wiring is a 2 wire (old) system. You shouldn't have a shock hazard if the wires are in the junction box for the dishwasher.