Do you have a question about the Asko T743 and is the answer not in the manual?
Certain materials are not suitable for tumble drying. Always check and follow the instructions on each item's laundry label.
The lint filter must be cleaned after each load. If you have very hard water, this can cause limescale deposits.
Check that the door is properly closed, the main power switch is on, and the plug is connected. Check fuses and breakers.
The overheating cut-off shuts off the dryer if the temperature is too high, caused by lint clogging the lint filter.
L1 flashes indicates the maximum program time has been reached. Read 'Drying takes too long'.