Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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Mq pump leaking base - Grundfos MQ3-45 1 HP Pressure Booster Pump

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  • 485 Answers

Check the mechanical seal.

Posted on Jan 16, 2014

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Posted on Jan 02, 2017

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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

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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...

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...

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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...

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Problem with mq pump


MAKE SURE THE PUMP IS WIRED FOR 120/220. THE WIRE GAUGE
SHOULD BE #12 OR #10 IF 100 FEET.

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

1 Answer

Hi, I have a Grunfos mq cold water booster pump. It is cutting in and out when the water is not in use, Turns on for 15 seconds tehn off for a minute. I have checked for obvious above ground leaks which...


First check with a pressure gauge to see that the pressure is, indeed, dropping. Then, if it is possible, turn off the outlet valve to isolate the pump.
If pressure is still dropping, there is probably a check valve on the inlet of the pump that prevents water from the high pressure side from leaking back to the inlet piping side.
To test this, let the pump run and pressurize the house and immediately close the valve for the incoming water. If the pressure holds, then open the inlet valve and see if the pressure drops. If it drops, the inlet check valve has to be replaced (or cleaned).
Gary

Feb 19, 2011 | Grundfos Plumbing

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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