The F35 indicates a water level pressure sensor failure. The SUD is normally displayed when there is excessive detergent suds in the tub. A loose wire harness connection could be causing this problem if there is no water or suds in the tub. I recommend
unplugging the washer
and removing the top panel. Screws at the very back of the top panel secure it to the washer frame. Remove the screws and then pull the top panel slightly back and then up and off of the washer. The analog water level pressure sensor is shown in the first image below. The second image shows a clear picture of this component. Check the wire harness connection on this sensor. If you find a loose connection, secure the wire harness properly on the component then reassemble and test the washer. If you continue to get the F35 code, then this component will need to be replaced.
You can order a new analog water level pressure sensor from the
If you need more help with this problem, resubmit your question with additional details and the full model number of your Kenmore Elite HE5t Steam washer.