I have just had the same error code on my machine and confirm it is a faulty out of balance switch. The switch is located under the grey module when you take the top cover off. Mine was corroded this is a normally closed switch I check mine with multimeter and it wasn't working. Rather than buy a new switch I cleaned it by soaking in vinegar then flushing with water, once dry I reinstalled and it now works fine.
starcee, February 2008