A residential sump pump high-water alarm is triggered when rising water inside the sump pit basin exceeds a safe threshold (usually a couple of inches below the top of the pit or just above the primary pump's normal activation line). This occurs if the primary pump fails to turn on, a power outage shuts the system down, or heavy storm inflow overwhelms the pump's capacity, lifting a secondary alarm float switch to close the electrical circuit and sound the buzzer. Verification: Test the alarm by manually lifting its separate sensor float to ensure the siren activates instantly.
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