When a sump pump high-water alarm sounds, it means the water in the basin has reached an unsafe level and your primary pump has failed to evacuate it. Step 1: Mute or silence the alarm box. Step 2: Check if the pump's power cord is plugged securely into a working GFCI outlet and verify your home circuit breaker. Step 3: Inspect the float switch to ensure it is not stuck. Step 4: Unplug the primary pump, wait 30 minutes for thermal cooling, or prepare to install an emergency backup pump. Verification: Verify that the water level drops and the alarm stops once the pump runs.
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