YOU could tell yourself what the code means.
Just do a Google search for the model number of your machine and E63.
Here are some results I got for the partial model code you provided:
http://www.justanswer.com/uk-appliance/6cn38-hi-bosch-washing-machine-classixx-1200express.html
http://www.ukwhitegoods.co.uk/help/fault-codes/laundry-fault-codes/3308-bosch-wae-range-washing-machine-fault-codes
http://www.fixya.com/support/t24772264-bosch_e63_error
As you can see, it will be important to have the exact model number or the exact model description.
acp
March 2017