Bosch · Washing Machines
Excessive foam is building up in the drum or is detected by the appliance's foam detection system. This usually indicates that too much detergent has been used for the laundry load.
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Immediately mix one tablespoon of fabric softener with 0.5 litres of water and pour the mixture into the left-hand detergent compartment (do not use for outdoor, sportswear, or down-filled items).
For your next washing cycle with a similar load, reduce the amount of detergent used.
Ensure you are using the correct detergent type and amount according to the manufacturer's recommendations for your water hardness.