Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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Noise in pump

Grundfos mq3-45

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Posted on Jan 02, 2017

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SOURCE: My house pump is just making a humming noise when I turn it on?

replace the start/run capacitor on the pump
any electric motor repair shop will have a suitable replacement

Posted on Apr 12, 2017

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1 Answer

My house pump is just making a humming noise when I turn it on?


replace the start/run capacitor on the pump
any electric motor repair shop will have a suitable replacement

Apr 12, 2017 | Grundfos Plumbing

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...

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

The circulation pump making noise.


Question posted under Grundfos recirculation system.
If pump is making noise, then air or sediment is probably trapped at the impeller.
Remove pump, and connection between hot-and-cold pipes and clean with white vinegar.
Or use CLR but do not soak parts in CLR or it can cause damage.
Additional Resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html

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Sep 06, 2011 | Grundfos Comfort System Recirculator ...

1 Answer

My Grundfos central heating pump is making all sorts of noises since I drained the system to replace a radiator valve. Any suggestions how to fix?


Did you bleed all air from the heating system after replacing the valve?
Did you bleed several times?
Gary

Apr 25, 2011 | Grundfos Plumbing

1 Answer

A friend has a grundfos comfort hot wter recirc system and is getting a chatter or water hammer noise at night after the toilet is flushed.he tells me it sounds like it's coming from under the counter...


1) Unplug grundfos and see if same problem occurs.

2) Noise can be cause by water not flowing freely.
Disassemble parts and clean with CLR (calcium lime rust).
http://waterheatertimer.org/Water-heater-recirculation-system.html

3) Any time there is a humming sound, it can be the motor.
I would also use CLR and clean out Grundfos pump.

4) Any pump or motor that slows down, is overheating, and burn out.

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Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 06, 2011 | Grundfos Comfort System Recirculator ...

1 Answer

Pump started to make a rattling noise after 4 yes of perfect operation.


Pull off the pump and clean it out.
The noise could be sediment build up causing pump rotor to make noise.
Noise could also be bad bearing or bad rotor.
Noise could be air bubbles in the line.
Once pump motor begins to slow, no mater what the cause, it overheats and begins to burn out.
Many times, once a motor has slowed, it never recovers and spirals downhill and stops working.
There are no repair parts for recirculation pumps.
Following page has general information plus links to Grundfos manuals, installation, and contact.
http://waterheatertimer.org/Water-heater-recirculation-system.html#Grundfos

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Also take advantage of fixya phone service.
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Fixya is always less expensive than a service call.

Feb 05, 2011 | Grundfos UP10-16B5/ATLC Comfort Series...

1 Answer

My Grundfos MQ3-35 has become very loud. Does it need lubrication, which has not been done in years? If so, I do I lubricate? Thanks, Ken


The bearings fitted to this pump are lubricated for life - if the noise is bearing related they will need to be replaced. If the noise is not from the bearings you will need to establish the cause - possibilities are:
Cavitation (sounds like frozen peas inside the pump!) caused by restricted suction - check for blocked strainer etc.
Foreign matter in the pump....
Loose impellers
Sometimes a piece of wood or a large screwdriver used as a stethoscope can be very handy in determining where abouts in the pump the noise is coming from.
Given more specific information I can suggest the next course of action.
Good luck
Mike G

Sep 26, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...

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