Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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My grundfos MQ 3's motor sounds like it is locked up. When i plug it in everything seems to work except the motor just humms until the alarm shuts it off. There is nothing blocking the impeller. What would cause this?

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Hi,
Either the motor has gone bad and will not start or the capacitor is bad and is not helping the motor to start...an experience repair person can tell tou what is happening...

heatman101

Posted on Jul 12, 2010

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No water


Does the motor turn it self off after a couple of minutes of no pumping?= ran out of water. If there is water up to the pump and still no water, check filter/s ( if there is any). Undo V band and check pump internals, impeller may be broken from shaft? When putting back together tap V band with block off wood or back of screw driver evenly as you do up the clamp to stop it distorting

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Louise, since there is several different types and models of Grundfos pumps it would be hard to answer your question. To possible point you in the right direction below are a few links to where you can find some PDF documentation about a popular Grundfos pump the MQ series and direct link to the manufactures "Service Support".

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1 Answer

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Sounds like the discharge is plugged. You can get the manual at: http://rainwatercollection.com/download/Grundfos-Manual.pdf

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1 Answer

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Grundfos said the problem of on off every few seconds was air in the line. Then

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1 Answer

I have a problem with the MQ-35 pump starting and running for about 10 minutes when there is constant demand (such as running a sprinkler) and it then alarms and shuts off for 30 minutes before it will run...


This sounds like a issue with air still being in the system and not being removed from the system to make things work properly. I did try to findthere number and was unable to locate it. The only other option for you is to return the product and find one with better support

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