NOt to sure about dishwashers but we were having issues with our washing maching. It was giving us all these fault codes. So not wanting to have someone come up or carry it up the stairs we looked online and found out that behind the kick plate there was a manual for the repair man that outlined what the fault codes were and how to fix each one of them! I have fixed 3 or four of the codes now myslelf and it is still running great!
Try just googling the issue perhaps there is the same thing for your dishwasher tucked away somewhere!!
Good luck