A sump pump high-water alarm sounding when the pit is completely dry is usually triggered by a stuck or dangling float sensor, a displaced alarm activation weight, a low battery signal on a standalone alarm unit, or moisture short-circuiting the sensor contacts. Step 1: Mute or unplug the alarm unit. Step 2: Inspect the alarm sensor float to ensure it is hanging freely and not falsely triggered. Step 3: Check if the alarm battery needs replacement. Verification: Verify that the alarm resets to normal standby mode once the sensor is repositioned.
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