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I have a zoeller backup pump, water powered and it doesn't turn off. I strat the water supply, it works good, but when it drains the water and the float drops down - it still runs. The pump is model 503 and it is brand new.

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The cut off switch attached to the float switch is faulty. when the float drops, the switch should be activated with the float going down. Check the sensor to this which goes to the control unit. If the drive or the sensor amp on the water level controller is faulty , you will have to change after identifying the section with a simple voltage check.
If this is a new unit , then please avail the privileged warranty of the unit. get a replacement if you can talk to them and that would be the best than to open and tamper.
Hope my advice helps.Credit if you think so.

Posted on Aug 21, 2010

Testimonial: "Thanks for your advise, it helps. I thought that that may be te issue, but I was hoping that it is not for a simple reson that the sump pump is new."

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If I undrestand your description, when the resevoir is empty, the float lays on the bottom of the resevoir but, the pump doesn't shut off, after water is pumped out? You have to look at this as opposite of a toilet tank filling with water. In a toilet, the water rises and the foat turn the water flow off. In a sump the water will rise, and the float will turnthe pump on until the resevoir is empty, then it will open the system and turn off the pump. If the float doesn't rise, the resevoir will overflow and the pump won't come on at all. If the float rises and the pump comes on but, the float does "not" drop, the pump will continue to run after the resevoir is empty.
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