Have you done YOUR OWN Google search yet?
Surprised you missed these:
http://howtomendit.com/answers.php?id=36422
http://www.justanswer.com/uk-appliance/7jvbw-kenwood-kid60s10-e4-error-drained.html
Hell. why not even find the manual? Especially page 28
https://www.partmaster.co.uk/images/mediator/90/1)%20instruction%20manual%20kid60s10_ib_final110426.pdf
Anon, January 2017