"Fdl" is a door latch error code. This could be an indication of a door latch failure, or a defective relay on the Central Control Unit (CCU) that controls the door latch.
If you cannot get the door to open, there is a manual release you can use to open the door. The following link explains how to access:
http://www.fixya.com/support/r3576511-door_jam_on_kenmore_elite_and_whirlpool_
Make sure you UNPLUG the washer before servicig inside the unit. In some cases, using the manual release can return the washer to normal operation. However, if you still have problems there is a tech sheet inside the appliance that explains all the error codes and how to troubleshoot them. The test points required to diagnose the problem are also included. The tech sheet should be located directly behind the lower toe panel, or affixed to one of the interior cabinet walls. I would begin by checking all the interconnecting wire connectors between the CCU and door latch to ensure the connectors are all seated properly. Unplugging them and reseating each one can help.
If you determine the door latch to be the cause of the problem, the following link explains how to access and replace:
http://www.fixya.com/support/r3575840-replacing_a_door_latchReplacement parts (if required) can be purchased on line at any of the following websites:
searspartsdirect.com
pcappliancerepair.com
appliancpartspros.com
repairclinic.com
Prices vary between these sites, so shop and compare.
If you have any questions about this repair, please post back and let me know. I hope this helps you.