I installed a new control board on my whirlpool duet washer. I got an F99 code so I pressed the steam button for 3 seconds and released four times and it went into test mode.

SOURCE: Electronic control panel stuck on Whirlpool Duet Sport Washer

it looks like the panel switch is brooken . if you take the panel off and see if the switch.it may get stuck.

SOURCE: Whirlpool duet front load washer flashes F35 shortly after start

Sud= The unit has sensed there is too many suds in the unit it will flush and pump out for 5 min and restart on its own..This is caused by too much soap use..
From the book :
SUD Code=
If too much detergent was used:
—Run the unit through a Rinse/Spin cycle.
—Run a Normal cycle without adding any detergent.
This should clear the unit of the excess detergent.
1. Check the drain hose and make sure it is not plugged
or kinked.
2. Unplug washer or disconnect power.
3. Check wire harness connections to the drain pump,
pressure switch, and Central Control Unit (CCU).
4. Check/clean drain pump filter of foreign objects.
5. Plug in washer or reconnect power.
6. Check drain pump.
7. Check the pressure switch.
8. Verify CCU operation by running a Diagnostic test or any
cycle.

SOURCE: whirlpool duet gas dryer ggw9200l need error codes

There is a mini manual located inside of the machine whith the codes and troubleshooting guide on some they are on left and some are under the top.

SOURCE: new whirlpool dryer duet steam wont work

Sound like the unit doen't know the door is closed the door switch is not working. does the light inside the drum come on when the door is open and off when the door is closed

SOURCE: Whirlpool Duet Steam Dryer Beeps 3 Times But Does Not Start

Brand new unit - same problem. After an hour of investigating, I found the issue.
You don't actually have to SLAM the door. If you look closely, there are 3 separate pins that must latch. One is a simple push-button style which latches no problem.
The others are little prongs at the top and bottom of door. The bottom prong latches cleanly, but the top one will not latch because the door is a bit too flexible.
Close the door normally, then firmly press on the top edge of the door. You will hear the final latch grab, then you press and hold the start button. The dryer starts normally.
Yay!