Question about Little Giant Submersible Fountain Pump

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My pump is running but not sucking up water

My pump stopped pumpping water and ther is nothing blocking the entry

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Well if possible look into suction screen and see if Impeler is turning , I'll bet not , most of the lil giants come with a easy to remove pump cover (screw) so one can access the pump cavity to remove forign debris , also one can manually rotate impeller with finger (unplugged) to ck for free movement , if its hard to move your pump needs replacement

Posted on Jan 31, 2015

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There are several possibilities here. All involve water pressure. The first is that you have a water leak between the pump and where the water is going to.
The second is that the pump is not getting enough water to it so it is sucking air well as water in an attempt to give you water perssure. This could be caused by not having an inline "one way" valve on your supply line just before the pump ($30.00).
The third involves two little screws on the control where your electical connection is. These two screws control the high and low pressure settings of your pump. If your high setting is too high the pump will simply keep running trying to do the impossible, If there is not enough difference between the high and low setting the pump will also keep on. running.
Another possibility is that the pump has had debris (sand, dirt, mud, etc) sucked through it and has damaged either the housing or more likely the impeller that spins the water creating the pressure.Ther is also an internal seal that can be damaged by debris.
The final possibility is that the pressure control unit with the two little screws I mentioned earlier has failed and is deffective.

Most importantly if the pump is running hot please stop using it! You are at risk of fire and possibly the loss of your home and loved ones. Grundfos pumps can be serviced by a professional technician, Parts are readily available and not extremely expensive. I would not recommend doing it youself if it is the some specialty tools may be involved depending on the problem. You will become frustrated very quickly.
A fast solution is to buy one of the cheap plastic pumps ($169.00) made in China. They are amazing for the price and will run with no problems for years if your water is free of debris. Fixing your Grundfos may run you the same amount and you maybe without a pump for a week or more depending on the technicians work load.
I am not saying "Don't fix your Grundfos" but you don't need to be in a panic about it either.

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yes it should run continuosly,(at least untill the water level drops.) a more common instance withthis machine is that the drain line is blocked/restricted, or somethingis ninthe pump housing. it is even possible hat the pump impeller has dislodged from the housing and although it sounds as if its "pumping" its moving no water..usually in htis case your able to open the filter assembly and "pushback on hte impeller(normal impeller will not ,ove back" however if it was dislodged it will have foward play.i would even blow out the drain hose form the pump to the drain standpipe, just in case.
F02 is def a long pump out time and no ther ewill be no high speed spin with water in unit(or if it thinks thers water in unit)

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