Follow the exact manufacturer's shutdown or non-use instructions and account for every connected fixture. There is no universal safe switch-off routine.
What the observation means
A leaking cistern or tap can continue feeding an isolated pump. Property users or cleaners may also use the room while you are away.
A useful next step
Arrange appropriate maintenance and clear instructions before leaving. Do not simply fit a timer or assume nobody will add water. If the manual's required water or power controls are inaccessible, obtain help rather than improvising a closure process.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.