Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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My Grundfos MQ pump operates for a few seconds and then switches off. After turning the electricity off and on the pump works again for a few seconds. All green lights on the pump work properly. Do you have a suggestion how to fix this problem? Thank you John Brouwer

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SOURCE: With the water running the MQ pump runs intermittently

This is a problem with your bladder in the pressure tank or the pressure switch. Ether one will produce this cycling on and off. Good luck.

Posted on Mar 09, 2010

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SOURCE: My Grundfos MQ pump intermittantly continues to run

I have the same problem and have found that the inlet check valve has a broken shaft in the center of device. It is a multi-piece plastic unit and it looks as if it is not quite seating and therefore the internal pressure leaks slowly back into my low pressure suction line. The pump will start and the pressure will build then shut off for about 30 minutes then cycle again. I am going to replace the check valve.

Posted on Apr 18, 2010

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1 Answer

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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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What type of pressure switch or pump controller on pump? Could be capacitor check. with power on try spinning fan at rear if starts probably cap. Have it checked. Could be controller faulty.

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2 Answers

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Pressure is bleeding back through the pump or system to the tank or well or where ever the water is coming from. Should be some sort of one way valve to keep water from going back to the source, mounted somewhere so that once pressure is pumped up, it will hold that pressure in the part of the system that has the pressure switch that controls the pump.

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1 Answer

My Grundfos MQ pump won't start after it has been idle for 4 to 5 weeks. It is installed at my weekend place in the country. This has happened several times. Pump was replaced once but problem...


There should be a small cap on the motor end of the pump, take that off and you will see the stainless steel shaft with a **** in it for a flat bladed screw driver. You should not need to turn the water off. A few drops might come out, but it's safe to do it that way. Turn the shaft with the screw driver and that should loosen up the pump.

Hope this helps.

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2 Answers

With the water running the MQ pump runs intermittently


This is a problem with your bladder in the pressure tank or the pressure switch. Ether one will produce this cycling on and off. Good luck.

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