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Grundfos PT18 pump wont turn off. - Plumbing

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Have the auqua stat checked to see if it is faulty

Posted on Mar 14, 2011

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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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Grundfos pump


It sounds like you have a bad pressure switch. I would also check the pre-charge pressure in the expansion tank. This needs to be 2lbs less then the "cut-in" pressure of the switch IE: 30-50 switch 28lbs air in pressure tank.
RJH2O

May 11, 2013 | Grundfos JPS4 1 HP Pressure Booster Pump

1 Answer

I don't understand how to set the timer on my UP 15-10-B5/TLC Grundfos circulating pump. When it is not plugged in, we have a hard time getting hot water


Sounds like 2 problems:
1) Crossover and 2) Setting timer
Recirculation system has check valve that stops backflow of water when pump is turned off.
When check valve is clogged with sediment, or has worn out, then cold water enters hot pipe or hot water enters cold pipe when faucet is turned on.
Take apart connection where grundfos connects to both hot and cold pipes, and clean with white vinegar or CLR.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Water-heater-recirculation-system.html

Open following link for setting typical FM/1 analog timer module on Grundfos recirculation pump:
Your timer module may vary in appearance.
Slide switch selector might be located below timer dial.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg

Aug 30, 2011 | Grundfos UP15-10B5/TLC 1/25 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

After replace the cold water pipe line, my Grundfos recirculator pump does not work anymore. I have to wait 3 min to get hot water. Do you know anything wrong here? Thanks


Many times when pipes are worked on, the work loosens sediment that was built up in the pipe.
Sediment is probably why cold water line was replaced.
That's why faucet aerators get clogged up after pipes are worked on.

It sounds like your grundfos pump got clogged too.
Immediately unplug the pump so motor is not overheating.
Motors are meant to turn freely and can be damaged when blocked.

Take apart the pipes at grundfos pump and see if you can clean out the line.
If line cannot be cleaned or pump doesn't restart, then the grundfos has to be replaced.

Also look at adjoining pipes and see if there is a clog in nearby elbow, especially where galvanized and copper pipes join..

Dec 26, 2010 | Grundfos UP15-10B5/ATLC 1/25 HP ...

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...

1 Answer

My pump stays on after having a shower sometimes...


The pump will start and stop with a pressure switch that is mounted in the discharge of the pump. Sometimes pressure switches get sticky and won't shut off when they are supposed to. You can buy them at most hardware stores, the most common is a Square D, and you'll need to both connect it to the pipe and also to the power line and the pump motor.

Sep 13, 2009 | Grundfos MQ3-45 1 HP Pressure Booster...

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