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I don't get enough water through the pump to keep it running with pressure. Pump cycles on and off.

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Unfortunately this is rather common problem, there is several solutions, none easy. i assume that you already cleaned inlet filter and connection hose is good diameter. check your mains if it is fully open (open tap in full then back half turn), same with tap connected to your supply hose. try to re-locate washer as close as possible to your mains connector. do bear in mind that these washers require at least 2gallons of water per minute (9 litres per minute)

if this solution do not work, or it is not feasible, find some 20 litres (5gallon) canister which can survive mains pressure, connect it with very short hose to your pressure washer and other end to mains, i know this is not an ideal solution but it will give you about 3min bursts.

if you find my advice helpful, please do not hesitate to comment and leave voe4 for me, thanx!

Posted on Aug 02, 2010

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1 Answer

Why does my pump loose pressure


Sounds like your not using enough water, and or your pipes to sprinkler is to to small, causing pump to build up to cut off head. I cant lay my hands on a performance chart for your pump, but 60 psi cut off and 20 on sounds about right. Try running another tap when your sprinkler is running, and see if this keeps your pump running

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Wow, good job looking at all the possibilities. I have to ask, since you already bought the pump did you try it? Put the new pump in? Some machines like washing machines use a transmission, it is possible that the pump is sufficient for one function and not another. For what it is worth the first thing I would do is try the new pump. I know it was probably expensive and if it is not the problem you might want to return it but as you have discovered there are not many parts on the machine to fail. Most likely it is the pump or the valves and cillinoyds the pump moves water through like you have already surmised. If you do not wish to install the new on you might be able to uninstall the old one and see what it looks like running dry for just one second. my guess if it is not strong enough to pump the water 12" and a 12" water coulomb is only .5 Lbs (1/2 of a lb.) then there definitely is not enough head pressure on the pump and like you said it would have to be a leak or an open valve (the pump should produce at least 15 to 30 psi, city water pressure in many cites is 35 to 80 psig) so I would go for it, replace the pump. Good Luck.

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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 pump.as 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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If too much detergent was used:
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This should clear the unit of the excess detergent.
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2. Unplug washer or disconnect power.
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GE WBVH6240 front load washer runs on 38 min. of the speed wash cycle then stops and door unlocks at 18 min. Tried to restart via the drain and rinse cycle at 18 min., the water pump comes on but no spin...


Hello, Welcome to FixYa.

The first thing I'd suggest is removing the filter in the pump you spoke of and insuring the pump is clear...there may be alot of water though so hopefully you're close to a drain or have some buckets/towels handy.

If that fails to resolve the problem it could be a plugged or faulty pressure switch. Have you run a system diagnostic yet ?

Here's how and the subsequent code meanings...in the event you don't know...

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Let me know if any of this helps or perhaps you cannot read it, It is all included in the service manual I can send via email if you could use it.

Good luck.

Regards,

Macmarkus :)

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My first thought was that of a water logged tank which causes short cycling, from your notes the tank is good (the tank may be partially water logged though) If the tank is ok and your getting short cycling (and the switch is good) I would guess your check valve down the well has failed. As the pump creates pressure then shuts off the water may be going right back down the well causing the pump to cycle again. This could also account for the poor water pressure as the check valve may be stuck slightly open allowing the system to loose pressure but only allowing a small amount of flow by when running. There could be a leak within the pumps drop-pipe and your loosing pressure through this leak. I expect you'll have to have the pump pulled.
I hope this may have helped,
Tom

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