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- Battery needs water
- Battery is old and needs to be replaced
- Battery is discharged or defective
- Cable is loose or terminals are corroded
- Power, fuse or circuit breaker has failed
- Pump has been activated; check the main pump for failure
- Backup pump defective or clogged
- Automatically tests pump weekly
- Backup pump runs off AC power as well as battery power
- Displays percentage of power remaining in the battery
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