Why does my washer display 'SUD' and what should I do?
The 'SUD' display means the washer detected excessive suds and has automatically started a suds routine to remove the extra suds and ensure proper rinsing of garments. You do not need to take action — the cycle will complete on its own once the extra suds are removed. To prevent this in the future, use only HE (High Efficiency) detergents. (Page 23)
From the official Whirlpool Duet Front Load Washer manual, page 23
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