Diplomat dishwasher stopped! 5 lights on how do i fix?

Had a power cut & now dishwasher not working.Diplomat no model nbr supplied by Howdens 2 years ago with new kitchen.Never any problems til now. Has 5 lights on permanently so am assuming has good power.Need to reset? Tried the 4 presses,turn off,close door to reset but not working for me! Can you advise what to do? Thnx,Aitch.