The wrong amount of detergent has been used (too little or too much).
Check the dispensing quantity of detergent. Please follow the manufacturer’s instructions.
If you are using the “Pre-wash” extra option, pour 1/3 of the detergent into compartment I and 2/3 into compartment II.
If you are using TwinDos, check the TwinDos dispensing quantity in the washer-dryer settings. Proceed as follows to check whether the right dispensing quantity has been set:
Go to the “Settings” menu and select the “Set dispensing quantity” menu option.
The values set for dispensing detergent from compartments 1 and 2 can be checked and corrected.