Whirlpool Duet washer SUD error

Subject washer will start to fill, then stops and displays the error msg. SUD
Washer will work ok if cold water is selected.
Think it’s either a bad water temperature sensor, or a bad heater/heater relay.
This is a 2 year old washer and could only find info on a WFW9600TC00
A service manual/job aid is needed, but can’t find one.Also, sometimes it will display the msg. F35 which calls for replacing the steam switch.
Hope someone has seen this before.

I do not know if you saw this but ir seems to sddress your problem
http://appliancejunk.com/forums/index.php?topic=1792.msg6159#msg6159