The E15 error code on a Bosch dishwasher means that the dishwasher has detected too much water and there's a risk of a leak. The control board receives a signal from the flood switch, activates the water pump to drain the water, and then turns the dishwasher off. The error code could also be caused by a control board glitch.
***To fix the error code, you can try:***
* Turning off the water inflow
* Performing a hard reset by disconnecting the power to the dishwasher for five minutes
* Tipping the machine to drain the water and investigate the source of the leak
I have found a couple of things are the culprit:
# Inlet valve faulty and leaking (Replace)
## You'll be able to feel it leaking if this is the case
# Fill Hose leaking into the base
# Sump Gasket or Diverter Valve (Replace)
## This can be tricky. You may be able to put food coloring into the sump and let it run to see where staining shows up.