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Float switch is broken or stuck
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Too much water is overwhelming the pump
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Clogged sump pump intake screen
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Sump pump is air locked (on but not working)
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Sump pump is jammed by mud or stone
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Power outage
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Tripped circuit breaker or blown fuse
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Sump pump is burned out
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Broken pump impeller or drive shaft
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Clogged or frozen sump pump discharge