It looks like that is not correct Conductivity sensor (two brushes; wiring and electronic). I'd like to know if you replaced the both carbon brush (6), which makes contact with the drum shaft is situated in the protective housing (7) of the drum shaft and carbon brush 3b.
The last alarm code memorized can be displayed even if the appliance is in normal operating mode (e.g. while the drying
programme is being performed):
- Press button start/pause and first nearest button simultaneously for at least 5 seconds: the display shows the last alarm. The alarm sequence continues to flash as long as the two buttons are held down.
The appliance continues the cycle while the alarm codes are being displayed. If the appliance is in programme selection mode, the options previously selected are stored in memory.
However, your tumble dryer is smart and if something is wrong it should be displayed by the alarm codes.