Wastewater may have accumulated while the pump was unavailable, or the system may require a documented recovery process. The exact warning matters.
What the observation means
Restored power does not prove that the unit has safely cleared or that every control has returned to normal.
A useful next step
Keep fixtures unused until the owner's instructions and actual condition support resuming use. Record the outage and alarm state. Do not add a test flush immediately, repeatedly silence the alarm or assume a briefly running motor has resolved the underlying condition.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.