see point 6.
I was once called out to take a look at a dishwasher for similar reasons. It was about a week old and totally useless. A lot of work had been done on the kitchen fairly recently including a new draining board for the sink.

The appliance people had been sent round to install the cheapest model of dishwasher. Only to find that it would no longer fit under the counter due to the new draining board.their elegent solution was to remove the pipe that allowed the draining board to drain. Finding this to be still to tight a squeeze, in an excellent bit of lateral thinking they decided to cut the top off the dishwasher. Yes you read that right, I pulled out the dishwasher to find that a large hole had been cut in the outer casing. With a bin bag taped over the top as a replacement. Un surprisingly as the hole was directly under the disconnected drain for the sink draining board, the bag had failed and allowed water to fill up the dishwasher electrics.
( willenium Fist bump for verification, Mon 19 Jan 2015, 9:33, Reply)