Question about Grundfos MQ3-35 3/4 HP Pressure Booster Pump

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The base of the pump leaks grundfos MQ - Grundfos MQ3-35 3/4 HP Pressure Booster Pump

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Posted on Jan 02, 2017

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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

  • 1 Answer

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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SOURCE: Grundfos pump leaking?

If it is starting and stopping, it most likely does have some type of leak. The check vavlve is normally installed on the suction side of the pump, and sometimes instead of a check vavlve or in addition to, there is a foot valve. A foot valve is just a check valve (usually with a screen) at the end of the line in the bottom of the cistern. If you have much suction lift, and the check valve leaks (or any leak in the suction piping) then the water will drop back into the cistern. This will also cause the discharge side of the pump system to drop in pressure, causing the pump to restart. You mentioned removeing the pressure tank, that tank keeps the pump from short cycling when you have low demand on the system. If the pump is higher than the cistern, and you don't see a check valve between cistern and pump then you most likely have a foot vavle in the cistern. Hopefully it's accessable by removing the pipe.

Posted on Aug 01, 2010

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1 Answer

Grundfos pump


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".

Service support
Grundfos MQ Series Pumps

Feb 07, 2014 | Garden

1 Answer

Triton t200re shower


Paul. Is it only the shower that the pump cuts out? i dont think we have these pumps in AU. Would bet that its a flow issue. Either remove the water saving device in the shower, if there is one. Pr turn another tap on just a dribble when you start the shower?
We have these issues with "smart"? controllers that think there is a leak

May 19, 2013 | Grundfos Pumps Grundfos MQ 3-45 1 HP...

1 Answer

Grundfos runs intermittently and needs power cycle to get going again


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.

Jan 27, 2013 | Grundfos Pumps Grundfos MQ 3-45 1 HP...

2 Answers

Grundfos MQ pump starts every 15 seconds


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.

That or you have a leak where you can't see it. (Actually you do, it is just internal and not leaking outside the pipes!)

Nov 04, 2012 | Grundfos Pumps Grundfos MQ 3-45 1 HP...

1 Answer

Low pressure from grundfos pump to house


Does your system equipped with pressure tank (pneumatic tank)? If it has, maybe it's already filled with water due to some pinhole leaks. Drain the tank and see what will happen.

Oct 30, 2012 | Grundfos Pumps Grundfos MQ 3-45 1 HP...

1 Answer

I have a problem with mq booster pump every 10 seconds kicks back and kicks on i am check the showers no leaks everything is ok please tell what can be a problem


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

later admitted it was the control unit. After replacing two units in 2 yrs I replaced

it with a standerd pump pressure switch.....Runs fine

Nov 17, 2011 | Grundfos MQ3-35 3/4 HP Pressure Booster...

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.

Mar 09, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...

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