Give each unit's location, accessible model and connected fixtures. A generic report that 'the pump is noisy' can send attention to the wrong system.
What the observation means
A clean-water booster, wastewater unit and condensate pump can coexist. Do not trace them by switching random supplies or operating every fixture.
A useful next step
Use records and ordinary observations already available. Label uncertainty clearly and tell the service team which room first showed the problem. Correct identification supports safe planning without owner dismantling or unnecessary tests across the property.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.