Error code 4 on my whirlpool dishwasher also water spilling from overflow pipe under the machine?

According to the information in the first link; F4 indicates a drain failure in your dishwasher. It will flash if the sump is not empty of water, if the pump has run for more than four minutes or if the electronic control PCB is defective. Hope you get it figured out and fixed soon.
www.ehow.co.uk
www.appliancefactoryparts.com