E02 is listed in the service manual as;
Running without heating.
Possible cause is listed as, "Working relay of heating defective".
The cure is listed as, "Replace the power module".
Unfortunately it would appear that you have a fault on the main control board of the appliance.
The cure is to replace the main control board.
This is located on the right side of the appliance and requires the right side panel to be removed (as well as the top).
If your machine is under 2 years old, and you still have proof of purchase, contact Bosch as the appliance has a 2 year warranty.
If it's over 2 years old, sorry, you need to replace the power board to try and cure the problem.
Sorry it's not good news or an easy fix.
Hope this is of some help
Let me know how it goes or if you need more help