Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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Grundfos MQ. After period of no use, alarm button is red and pump does not come on.

I have a Grundfos MQ. It seems to work fine but usually overnight or if away for a few days, the alarm light is on and the pump doesn't pump. Don't seem to have any problems through the day if it is being used regularly.

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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

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heatman101
  • 43501 Answers

SOURCE: my grundfos MQ 3's motor sounds like it is locked

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

  • 11800 Answers

SOURCE: I have a Grundfos MQ3

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.

Posted on Oct 05, 2010

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1 Answer

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

Apr 14, 2014 | Grundfos Pumps Grundfos MQ 3-45 1 HP...

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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

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...

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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...

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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...

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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...

1 Answer

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...


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

Jul 12, 2010 | Grundfos MQ3-45 1 HP Pressure Booster...

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

May 04, 2010 | 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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