Product review (5 stars): SUDS - F35 ERROR:  FIXED!
I purchased my Whirlpool Duet WFW9500 in 2008. It worked well until this year when it began showing "SUD" and "F35" error messages. I reviewed the YouTube videos on the subject. First, I began putting less than the recommended HE detergent in as this was supposedly a problem (see SamuraiRepairman video). While improved, I was still occasionally getting the error code. I opened and cleaned out the drain plug at the bottom as advised by "gioninos". No effect. Things began to escalate and my wife was unable to get a load of clothes washed as the F35 came up within 5 minutes on every load. I checked the CCU (central control unit?) as recommended by the Jared Johnson videos. Removing this was a major pain and I had to be careful to tag the connectors so I didn't connect them in the wrong spots when I hooked it back up. After careful inspection of the capacitors, I saw that they did NOT appear to have raised tops (flat as pancakes) and were probably NOT damaged. I reconnected the CCU. Finally, I bit the bullet and purchased the recommended W10156252 Pressure Sensor Switch for $123.00. Problem solved! We've washed 20-30 loads of all types without a single SUDS or F35 error. The actual switch shipped was W10312527 which is apparently an upgraded version of the one recommended at http://www.whirlpool.com/digitalassets/MLPDF/Repair%20Part%20List%20-%20W10188973.pdf