As you may know, the second phase of the descaling process is the phase with rinsing with pure water.
The machine exits the descaling process only if sufficient amount of water flowed through the machine during that second phase. [br]
If it was too little amount of water during that second phase, the machine remains in descaling mode.
Solution: Try descaling, and for the rinsing phase completely fill the water tank up to the very top with water.[br]
I have read, sometimes people even had to refill the water tank during the actual rinsing process (i.e. when water was still flowing).[br]
Then the machine will exit the descaling mode.