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

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Can I Download A Manual for for the Grundfos MQ35B Pump

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Need to find a user manual for a Grundfos pump I91340615 P10733, Type CH2-30


ManualsLib.com and enter grundfos pump ch 230 in the search area. Make sure to enter with the proper spacing.

Sep 28, 2016 | Grundfos Hardware & Accessories

1 Answer

Grundfos MQ 35 won't run


Sounds like the discharge is plugged. You can get the manual at: http://rainwatercollection.com/download/Grundfos-Manual.pdf

Jan 24, 2014 | Plumbing

1 Answer

How to connect iton to 220 volts


http://rainwatercollection.com/download/Grundfos-Manual.pdf
From what i have researched you have to buy a 120 volt pump or a 220 volt pump you cannot wire it both ways. The pictures shown on that pdf show where to put the line 1 and line 2

Oct 10, 2013 | Grundfos MQ3-45 1 HP Pressure Booster...

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

My water heater needed to be restarted and my comfort recirculation system isn't working now.I"m hoping it is just the timer. I need to reset the timer and I don't know how. I can't find my manual....


Grundfos timer and pump operate by plugging into ordinary 120V outlet.

1) If outlet has power, then dial on timer should rotate.
If dial is not rotating, then check power to outlet.

2) If outlet has power, but timer is not rotating then timer has gone bad > if grundfos pump is working but timer is not working, you can buy cheap plug-in timer and use that as the timer.

3) If outlet has power and pump is not working, then manually rotate timer dial to see if pump will start.
If pump will not start, then you need a new grundfos.
There are no repair parts for these pumps, and nobody at Fixya has reported taking Grundfos apart and repairing it.
My Grundfos pump will not come apart.

4) Following link has links to Grundfos installation manual, website, product manuals, and contact.
http://waterheatertimer.org/Water-heater-recirculation-system.html#Grundfos

5) To set timer: Grundfos timer dial has movable pins that are used to set on-off times.
When pins are pushed out, timer turns pump ON.

6) Rotate timer dial clockwise until current time lines up with arrowhead located on inner dial.
Dial rotates as time passes, and pins move a lever that turns pump on-off.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on Grundfos or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 09, 2011 | Grundfos Comfort System Recirculator ...

1 Answer

Need to find a link to the owner's manual/ repair manual for the Grundfos up10-16 b5/atlc......


Following link shows links to grundfos and grundfos manuals.
http://waterheatertimer.org/Water-heater-recirculation-system.html#Grundfos

1) My grundfos stopped working because sediment clogged the pump, and the motor slowed.
When motors slow, they get hot and burn up.
I ask my friend who rewinds motors how to fix it, he said in the old days, they rewound every motor, but today they throw valuable scrap into landfill, and then buy new motors from China.
I told him not to retire, but go to school and teach kids how to rewind motors, and then took apart the grundfos line and cleaned it out with CLR, but it never worked again.

2) If timer stops working, but pump still works, you can buy cheap plug-in timer and connect grundfos to the cheap timer

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 23, 2011 | Grundfos UP10-16B5/ATLC Comfort Series...

1 Answer

How to program timer?


Diagram showing timer tabs being pushed in or out to set programs:
http://waterheatertimer.org/Water-heater-recirculation-system.html#Grundfos

Grundfos illustrated installation guide
http://waterheatertimer.org/pdf/Grundfos-L-UP-TL-043-install-photos.pdf

Rotate programming ring clockwise until current time lines up with arrowhead on inner dial.
Current time must be reset after power outage.
Tabs located around programming ring control timer functions.
Each tab represents 15 minutes.
Tabs push in or out using a pen.
Tabs out = grundfos ON
Tabs in = grundfos OFF
Set manual switch to TIMER and timer program operates pump
Set manual switch to ON or OFF to override timer program

geno_3245_136.jpg

Dec 04, 2010 | Grundfos The UP1510B5ATLC 125th HP 1...

2 Answers

Just bought a house and it has a grundfos timer/pump attached at the hot water tank. I have no hot water and the timer doesn't turn (as I've seen other timers do). Is it supposed to turn so that the...


Grundfos is a sealed unit and not a repairable item.
The timer dial should turn.
And pins located around dial control ON-OFF functions as timer dial rotates.
geno_3245_93.jpg

Does the receptacle have power?
If receptacle has power, and Grundfos is not working, then it is broken.
Grundfos manuals for UP series pumps do not show breakdown or parts list of any kind.
http://www.us.grundfos.com/web/download.nsf/Pages

Bigger question:
Why don't you have hot water?
Is water heater functioning?
Water heater is a separate appliance from Grundfos pump.
Grundfos pump circulates hot water from tank into the lines so there is no waiting for hot water ... but hot water heater should still make hot water.
http://waterheatertimer.org/Water-heater-recirculation-system.html

Add a comment about water heater if that is also a problem.
You could have 2 problems, and water heater is main issue.

For do-it-yourself electric water heater repairs:
http://waterheatertimer.org/6DIY.html

Nov 20, 2010 | Grundfos The UP1510B5ATLC 125th HP 1...

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