Whirlpool integrated dishwasher ADG7540-flashing beeping

[dubdoc]

Hi my whirlpool ADG7540 is flashing on a pattern of 4 flashes with continuous beeping.Have cleaned water hose and put baking powder vinegar and boiling water twice now. Still on rinse and flashing in same pattern.Can anyone help?


Hi, having tried all other advice,ie.cleaning drains etc. I have now taken out the pressure switch as advised, how can I tell if it is this that is broken? its does not look as if it is damaged,what do I do now? can anyone help

 

[zipper]

F4 indicates a drain error. Check the sink spigot, drain hose, filters, pump, & pressure switch.
Plenty of posts on here covering this issue. Scroll down the page & check out "similar topics" or use the search facility & type in F4, 4 flashes, etc.