Clear practical instructions prevent accidental continued inflow. A vague note saying 'pump issue' may not make it obvious that flushing or nearby fixture use must stop.
What the observation means
The connected basin or shower may also be unavailable. Identify those fixtures plainly rather than expecting visitors to understand the pipework.
A useful next step
Provide an alternative facility and a contact route for reporting changes. Do not ask guests to reset switches or try a test flush. Return the room to use only after its safe condition has been established.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.