1) Flush the milk container.
Make sure the milk container is placed correctly and filled with cold water.
2) Start the descaling procedure.
Make sure you have inserted the Calc-Clean tool into the coffee spout correctly. You can find the Calc-Clean tool in a recess behind the water tank.
If you have checked the above and the CLEAN/CALC CLEAN button still does not work and you are also not able to brew a coffee variety with milk, the machine may have a technical problem.
In that case, we advise you to contact the Philips Consumer Care Center in your country.