Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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Grundfos mq 45 install - Grundfos MQ3-45 1 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

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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

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...

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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