By Samurai Appliance Repair Man,

Even though this problem has been around a while, I still meet lots of techs at the Appliantology Academy who get stumped by this one.  So, it seemed like a good topic for a quick primer on this classic problem: why the dishwasher controller throws this error code and the Big Four things that can cause it.  Come with me now on a Journey of Total Appliance Enlightenment™: