The drain pump on a dishwasher will always be located at the bottom of the machine, some can be accessed from the front as in this video, others you can removed from under the base of the dishwasher, But the first thing you need to do is drain the water from the inside using a

This video will show you how to clean filter and unblock the Dishwasher pump to clear the Bosch, Neff or Siemens E25 error code fault       Other type of Bosch, Neff or Siemens Dishwasher pump cover   The most common in my view is the impeller jamming on the pump normally something small