I googled KENWOOD E4 having got the error code and was amazed at the returns. Good news is that I seemed to have fixed it thanks to some of the replies. I was in the process of removing it - someone suggested tipping it back 45* to drain it - (it's an integrated model) but when I came to detach the drain I noticed this was connected higher in the myriad waste connections under my sink - dishwasher, garbage disposal, washing machine etc). I've cleaned the garbage disposal waste connection & the soap restrictions from the washing machine waste and made/remade the connections so the dishwasher connect is lower. No 'E4' or noise at switch on, it's now completed a 'cleaning' cycle - now for the big load after tea!! The height of the waste connection might explain why some people have experienced this repeatedly, this is the first time I've seen it in just over 12 months - I'll be keeping an eye on any restrictions building up in the wash machine & garbage disposal wastes from now on.
ron, February 2008