Http://whirlpool.custhelp.com/app/answers/detail/a_id/2948
Hi please go to this above link, it is all explained at length what is going on and what to do.
This error code indicates that excessive detergent suds occurred during the cycle.
If a "Sud" or "Sd" error code is displayed, or if you can see excessive suds in the window:
There are too many suds in the washing machine. The washer will not be able to spin out water with the excess suds. When "Sud" or "Sd" is displayed, the washer automatically extends the rinse time to remove the excess suds. During this time, the washer pauses the tumbling and adds water for additional rinsing. This pause allows the bubbles in the suds to break. This pause and rinsing are necessary and may occur several times to eliminate the suds. See the animation below for more information.
Sud code and subsequent F02 code on GHW9400PW4 Whirlpool Duet HT was caused by a clogged AIRTRAP, part # 8181731. When removed, cleaned out, and put back in, the washer drained and spun as new. 
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