Grundfos Garden - Page 8 - Recent Questions, Troubleshooting & Support

Pump will stop automatically if it run dry, so you need to check it.
It seems that most probably the float switch is faulty and because of that faulty component the pump stops automatically after 30 sec.
I suggest you to replace that switch and the pump will work again.

Hope this will help you. Good Luck.

Hi,
The bearing seal between the pump and the motor has gone bad...they are replaceable but it is a time consuming job that probably will not work for you the first time...you also will probably destroy the impeller when changing the seal...

Find a pro that has done this before and have them change the seal for you...

heatman101

Here is a link to the Grundfos brochure for your model of pump:

http://net.grundfos.com/doc/webnet/mq/download/mq50_19.pdf


And here is a direct link to the Owner's Manual for that model:

http://www.freshwatersystems.com/support/L-MQ-TL-001.pdf


To view the brochure or the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual.

You may need ADOBE READER installed on your computer to read PDF documents.
You can download this free at WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, then follow the onscreen instructions to install the software on your computer.

Frequent starting and stopping can be an indication of a leaky suction inlet pipe. Check the connections around the inlet for any signs of water leakage and repair as necessary.

Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck and take care.

Joe.

No this is not a problem at all. What you are probably remembering is the pressure when the supply was getting low. When it has a lower supply it will not be able to pump as much pressure. With a higher supply, it will pump more pressure. But this is perfectly ok.

If there is a surge tank in the system this is not working.
Try raising the cut-out pressure. It sounds like the pump is reaching high pressure even when you are using water.
Gary

Press the on/off button once to reset the alarm and once again to start the pump.
If the auto reset light is on, the pump will attempt to restart in 30 minutes.
If the auto reset light is off, press and hold the on/off button for 5 seconds.
Gary

Sounds like it may be air in the system - there is a black plastic bleeder screw on the top of the pump - open it and let air escape, if any, then fill with water, close screw and start pump.

You would be better off with a brand that has better representation than Grundfos. Several of our commercial customers change to brands such as Armstrong or Bell & Gossett the first chance they get because Grudfos is less reliable and getting parts or service on them much harder.

it sounds like a relay for the auto shut off ....http://www.smarter.com/water-pumps/grundfos-mq3-35-3-4-hp-pressure/pd--ch-47--pi-11277834.html

The only thing that would cause a problem like that is when the pump is no longer primed - the water has drained out of it and it runs on empty = overspeeds.
You need to replace the valves, they are leaking. Also make sure that the rain tank is clean, dirt and debris might block the valves.

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It sounds as if the mechanical seal is leaking. it could be a defect or was the pump allowed to run dry. The mechanical seal relies on the water to keep it from overheating. You can ruin a seal in a very short time if it runs dry.

Hi,
Those pumps run at such close tolerances that even a small amount of wear or scoring from debris will cause the pressure to decrease greatly...
a couple of thosandth can be the difference bewteen it working or not working...you cannot see that...

heatman101