I have a ''Fisher & Paykel Dishwasher Nautilus''. The problemm is that it runs through the cycles but the water does not spray out of the top sprayer and the flap of the soap container does not open. Water does spray out of the bottom sprayer I have checked the sprayer head for blockages. On one ocasion the letter and number ''U1'' were flashing. Can anyone help or refer me to some one. André