What should I do if the WASH light is flashing?
A flashing WASH light indicates that the drain is blocked and clogged so severely that the dishwasher cannot continue to operate satisfactorily. You should locate and remove the blockage in the drain system by checking the air gap, checking for kinks in the drain hose, and checking for stopped-up drains. To pump any remaining water out, latch the door, touch RESET, select desired cycles, touch START and RESET again. (Page 11)
From the official GE GSD4210 Top Control Dishwasher manual, page 11
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