This is a really strange error, but it makes some sense if you own a S9 One Touch model. Then there`s a problem with the squeezing valve located behind the steam/cappuccino outlet. If this is an older model, then it could be a problem with the ceramic valve, but normally this makes the water flud all over the frontpanel and inside. In both cases, i would recommend to send the machine to the nearest servicecenter.
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