You need to push the hot water button on the machine panel to allow water to run out of the steam wand. After a few seconds the machines ventilate message should clear.
Just had this problem. Machine continually needed ventilation with poor/no hot water & steam flow.
Fault was worn/broken steam valve cam (p/n 140640300) which is molded plastic & apparently prone to wear/breaking a critical "pin" on it so that it does not properly operate the steam needle valve.
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