What does the 'Sud' error code mean and what should I do?

The 'Sud' error code means there are excessive suds in the washer and it is running a suds reduction routine. Allow the washer to continue, and going forward use only HE detergent, always measure detergent, and base the quantity on load size following the detergent manufacturer's instructions. You can also press WATER HARDNESS to change the setting to 'soft.' (Page 17)