When your sump pump high-water alarm goes off, act quickly to prevent basement flooding. Step 1: Press the silence button on the alarm box if available. Step 2: Check if the primary pump is plugged in and receiving power from a working GFCI outlet. Step 3: Inspect the sump pit to see if the float switch is stuck against the basin wall. Step 4: If the primary pump is dead, use a portable utility pump or bucket to manually bail water while preparing to replace the failed unit. Verification: Confirm that water drains from the pit and the alarm resets.
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