What does the 'Sud' error code mean and how do I fix it?

The 'Sud' error code means there are excessive suds in the washer and it is running an automatic suds reduction routine. Allow the washer to continue running and make sure you are using only HE detergent, always measuring it based on load size per the manufacturer's directions. If the code appears again after touching POWER/CANCEL once to clear it and restarting, call for service. (Page 16)