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 washing machine 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.