The milk valve is clogged.
Clean the milk valve as follows:
- Open the appliance door. 
- Remove the bean container on the left and the maintenance container. 
- Remove the central spout’s stainless steel cover. 
 
- Remove the milk valve cover as follows: on the top right-hand side of the cover, you will find a pin for swivelling the cover out. 
- The milk valve cover should only be cleaned by hand. 
 
- Detach the milk pipework from the dispensing unit on the central spout (1) and from the milk valve holder (2) and (3). 
- Remove the milk pipework (1) connecting the milk valve to the central spout. 
- Disconnect the angular moulded hose from the round hose. 
- Rinse the hoses thoroughly under running water. 
- Do NOT remove the connecting pieces from the hoses. 
 
- Press the latches on the left and right-hand sides of the milk valve holder. Pull the holder forwards to remove it. 
 
- Take the holder and silicone seal apart. 
 
- Pull the stainless steel bolt upwards and out. 
- Clean the individual components of the milk valve in the dishwasher. 

