Question about Grundfos Comfort System Recirculator 595916

1 Answer

Grundfos stopped circulating.

One month past my 24 month warranty my Grundfos CS Recirculator stopped working. The motor housing gets very warm, but I've noticed others being told that "hot" equals a ruined motor. How "hot" is hot enough to cause replacement. I can place my hand on the motor housing and it warms me up nicely in this uncomfortable winter weather. But I do not need to withdraw my hand at any time. Before I continue troubleshooting, I think I need to know if it is worth the time.

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  • davidleehiat
    davidleehiat Feb 14, 2013

    They are designed to fail, the inpellors are plastic and break after a few months or a year of use.

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At approximately $238.95 new, it pays to do a bit of troubleshooting.
Below are some sites that may help:

http://www.plumbersurplus.com/Brands/Grundfos/74

http://waterheatertimer.org/Water-heater-recirculation-system.html#Grundfos


There are no repair parts for these pumps, and nobody at Fixya has reported taking Grundfos apart and repairing it.

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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  • 82 Answers

SOURCE: Grundfos installation with Buderus boiler. Pump

Do you have more than one zone? If so, it is difficult to tell if the circulator in question is actually running. A trick is to get a screwdriver and place the metal end on the front of the circ and the other on your ear. You will hear it if it is running. If you do hear it, is the circulator itself very hot to the touch? If it is, it may be burnt out, or the zone needs to be bled of air. Another doubtful, but possible, answer is that the circulator is installed backwards. There is an arrow on it and it should be aimed towards the flow of water.

Posted on Dec 31, 2009

  • 61 Answers

SOURCE: My hot water heater sprung a leak and after

pumps of this type will fail quickly without water. They are lubricated, and cooled by the fluid that runs through them.

Posted on Jan 03, 2010

SOURCE: After replace the cold water

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..

Posted on Dec 26, 2010

SOURCE: I have a Grundfos Comfort System. At the tap

Sounds like you have sediment built up in the pipes, and maybe the furthest faucet is the gathering place.
Take off each shut-off valve at furthest faucet and connect a water hose that flows into nearby toilet bowl.
You can buy garden-hose-to-1/2-pipe adapter at hardware.
Open water so it flushes the line into toilet bowl.
Then clean out valves and reassemble shut-offs and grundfos connection.
Remove faucet aerator and flush line up to faucet.
Install new aerator.

Posted on Dec 30, 2010

SOURCE: I've had my Grundfos Up1510SU7P

It sounds like thermostatic operation is not working.
I cannot offer specific repair, but can offer resources

1) Grundfos service options and warranty information + local distributor of parts and service center finder:
http://www.grundfos.us/web/homeus.nsf/Webopslag/OMAT-5S7J7X

2) Terminal strip and capacitor replacement does not show UP1510SU
http://www.us.grundfos.com/Web/Download.nsf/Pages/F3A9576228BA79AF0825691A006D2D0F/$File/Luptl028.pdf

3) Open following link for recirculation system resources including some manuals, but I don't have your exact manual.
http://waterheatertimer.org/Water-heater-recirculation-system.html
I can see your product on following link
http://www.houseneeds.com/shop/plumbing/recirculators/waterrecirculatorindex.asp

4) Recirculation systems operate 2 ways: with thermostat or timer.
Thermostat is supposed to turn off circulation when water reaches 100 degrees approx.
Until thermostat is repaired, you can work around problem by moving slide switch to TIMER and set timer to run intermittently so temperature at faucet is moderated.

5) Adjust temperature at water heater
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html

Upvote the help.
And 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.

Posted on Jun 01, 2011

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1 Answer

Same problem as another writer described: the Grundfoss comfort system for hot water only. I do not get instant hot water as the last pump (until it quit working). The pump gets very hot. I...


If the pump is hot, the motor has overheated and will stop working. There's no cure for motor at this point. Be sure to de-lime and de-scale re-circulation pumps occasionally.
Return pump and exchange for new. Sounds like you already diagnosed the problem correctly.
http://waterheatertimer.org/Water-heater-recirculation-system.html

Mar 27, 2011 | Grundfos Comfort System Recirculator ...

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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...

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Timer not working on grundfos up-15


1) I have a link for one type of timer replacement.
Have no idea if this fits your specific model.
http://www.plumbersurplus.com/Prod/Grundfos-24-HR-Programmable-Clock-Timer-%28505474%29/11040/Cat/680

2) Above is only repair part I've found for grundfos, and I look for this stuff.
http://waterheatertimer.org/Water-heater-recirculation-system.html

3) You can create a work-around by plugging grundfos into inexpensive wall timer that has 3-prong outlet:
http://www.amazon.com/59366-Appliance-3-Prong-Outlet-Repeats/dp/B001D8VIKE

http://waterheatertimer.org/Woods-timers-and-manuals.html

4) Grundfos system is replaced when it stops working.
If you have hard water, suggest you take pump off and clean with CLR.
Same with crossover located on farthest faucet.
Once motor starts to slow, it overheats and burns out.

5) 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 16, 2011 | Grundfos Comfort System Recirculator ...

1 Answer

We have three zones and one pump is not warm. It feels like the others that it is running, but the water in the loop affected is not heating. It may not be calling for heat but it is on the same thermostat...


These pumps work by timer and by thermostat.
I prefer timer-operated over thermostat because I use hot water at predictable times, thus cutting operation cost to a fraction.
http://waterheatertimer.org/Water-heater-recirculation-system.html

When my first re-circulation system stopped working, I took it off and cleaned it out, but it never started working again.
I also tried to take it apart to see if motor was repairable.
My electric motor guy told me that when motors slow down or stop rotating that they overheat and burn out.
I asked him about rewinding the motor, and he said in the old days, every motor was repaired and put back in service, but today they throw motors away. All that copper goes into the landfill for tomorrow's prospector. And he said what I noticed, that the pump assembly doesn't come apart for repairs.

You can remove the pump and try same things I did, but my guess is you need replacement.
I bought new pump from Lowes.
Local plumbing shops carry re-circulation pumps, and plumbers and handymen install them.
Installation is simple enough if you're handy and peripherally experienced with plumbing.
Grundfos instruction manual with photos:
http://waterheatertimer.org/pdf/Grundfos-L-UP-TL-043-install-photos.pdf

Add a comment for more free assistance.
Also take advantage of fixya phone service.
For a price, fixya expert says same thing shown above, and can help you install new one via phone.

Jan 02, 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 ...

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Pump gets very hot. Water not


That would be my guess. If water is not circulating then that points to impeller problem

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1 Answer

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Do you have more than one zone? If so, it is difficult to tell if the circulator in question is actually running. A trick is to get a screwdriver and place the metal end on the front of the circ and the other on your ear. You will hear it if it is running. If you do hear it, is the circulator itself very hot to the touch? If it is, it may be burnt out, or the zone needs to be bled of air. Another doubtful, but possible, answer is that the circulator is installed backwards. There is an arrow on it and it should be aimed towards the flow of water.

Dec 25, 2009 | Grundfos Comfort System Recirculator ...

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