F13 error code is a dryer NTC problem.
What you need to do is take off the top of the washer. From there you will see the dryer chamber on top. Towards the front of this is the NTC it will have 2 thin wires going to it.
Make sure the wires are on ok and not broken. If the wiring is fine then you will need a multimeter and test the NTC. It should give a reading in Kohms.
If the NTC is fine then its possible the control board at the back is the problem.
Im afraid on these washers if theres a fault anywere the washer just stops working and shows the error code untill its been repaired.