E24 is a pump problem, either the pump is faulty or it is blocked

Most of these smaller issues can be solved with the help of a troubleshooting guide, check out this short article and you'll get your device back on feet: Common Bosch Dishwasher Problems And Solutions

It is not the drain.
You have to close the door tight.
Push it in
It will start with no error E24

Fault Code E24
Symptom: Dishwasher not draining properly.
Cause: Drain filters blocked.
Action: Clean the filters.
Go to:Why is My Bosch Dishwasher Not Draining?

For more detailed codes see ...
http://www.drdishwasher.com/troubleshooting/manufacturer/bosch/error-codes