diplomat dishwasher adp8224?

Hi John, this is an old model now.E2 is a flooding fault but you will not find water.It is more than likely that the air break on the right side is blocked.Take off the plinth,then the silver front cover.Shine a torch to the right and the plastic flat matrix on the right is the air break.Does it have a dark sediment in the lower part?
If so, change the air break, you may have the old white one,if so you have to order part:KIT22LTEC
Try interspares on 01526322540.All the best.

FOXY
December 2008