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Recirculating Pump is not operating properly

Just had a plumber run the lines for a bar sink. Now my Grundfos UP10-16 B5/ATLC 1/33 Horsepower UP10 Comfort Series Recirculating Pump is not working properly, hot water takes a long time to reach the faucet. Is this due to air in the lines? If so, how should I correct this issue?

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  • 448 Answers

Air in the return line could be causing the problem. To purge the line will depend on whether or not any shut off valves or drain valves are installed in the line. If there is a shut off valve in the line and a drain valve or hose bibb ahead of or towards the return line shutting off the valve and draining the line through the hose bibb should purge any air out. With out knowing the actual piping layout it is difficult to explain how to purge the line also make sure the pump wasn't shut off or kunplugged when the work was done and not plugged back in or any valves were shut off. Hope this helps.

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

  • 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: The hot water comes on immediately and sometimes

If your grunfos pump is clogged with hard water sediment, then it probably needs replacement.
You can try soaking it in CLR for a while, but I doubt it can be salvaged.
Sediment adheres to surfaces and there is no way to get inside the pump and scrub it out with a tooth brush.

You might benefit from replacing pump with the type that has a timer. That might save a bit of money. Or you can add a timer to the ordinary grundfos. If pump works fewer hours, it shouldn't clog up as quickly (or so the theory says)
And your water system might benefit by flushing your water heater each 6 months to prevent sediment from forming in the water heater.
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

Posted on Oct 21, 2010

  • 14 Answers

SOURCE: My Grundfos Comfort System is not working. I has

Turn on the hot water at the farthest faucet from the water heater. Once hot water is at that sink immediately go check other taps in the home. If you have to wait more then 10 seconds for hot water at other taps then you have a branched system.

Posted on Dec 01, 2010

SOURCE: need to find a link to the owner's manual/ repair

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.

Posted on Jan 23, 2011

SOURCE: Same problem as another writer

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

Posted on Apr 10, 2011

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Hi Ray, did you ever solve your problem, I have a setup that sounds identical to yours and have the same problem, Grundfos are not been very helpful.

Oct 31, 2011 | Plumbing

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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

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 water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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

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

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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Grundfos recirculating system. Never has produced semi instant hot water at sink it is installed on. Could the original comfort valve be defective


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

The circulation system should draw hot water directly from the water heater as shown on illustrations on link above.

The Grundfos pump works on a thermostat, and some work on a timer.
Can you hear the pump working?
There should be a humming sound.
Check the timer -or- thermostat setting.

It is possible the lines are clogged with sediment if you have hard water.

If I was going to fix the problem:
1) check thermostat or timer
2) listen for pump sound
3) check electricity going to unit
4) take apart the pipes and inspect for clogging
If there is a clog, I would flush the line or soak the part in CLR (calcium lime rust remover)

The circulation pumps are sealed and there is no way to take apart the motor, timer, or thermostat for repairs.

add a comment if you need more assistance.

Nov 05, 2010 | Grundfos Comfort Series Replacement Valve

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