We present an EVN observation of the 22 GHz H$_2$O maser in a prototypical low-mass
protostellar system IRAS 16293-2422. The observation was conducted to characterise the cause of the newly discovered
enhanced maser activity in the source and to study the source's ejection behaviour as traced by maser
emission. Single-dish monitoring and analysis of archival data indicate that the activity of the
H$_2$O maser in IRAS 16293-2422 has a cyclic character and traces episodic ejection events in
the source. A new maser flare was recently discovered in a spectral feature that has never
shown such a significant increase in flux density before. The flare of this feature seems to
indicate the beginning of a new cycle of activity.