Question about Grundfos UP10-16BU/ATLC Comfort Series 1/33 HP Recirculator Pump with Union

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Grundfos Model 15-10su7ptlc pump does not seam to be running..just installed and no hot water

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  • Grundfos Master
  • 5,089 Answers

1) Check that plumbing is correct:
http://waterheatertimer.org/Water-heater-recirculation-system.html

2) The timer has 2 choices: thermostat operation or timed operation.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg
http://waterheatertimer.org/How-to-set-timers.html

3) Add comment and say what you discover

Posted on Jan 16, 2013

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  • 2 Answers

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Posted on Jan 02, 2017

  • 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: 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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After installing the thermo bypass valve on the furthest sink faucet from the water heater, the sink faucet has no pressure, and there is hot water slowly comling out of the cold water valve.


It sounds like the installation loosened sediment inside pipe.
Remove sink aerator and see if you can flush open the faucet.

Also check if other faucets are receiving hot water from hot-and-cold taps that says if grundfos is pumping hot water from the water heater correctly.
http://waterheatertimer.org/Water-heater-recirculation-system.html

When recirculation pump is running, both hot and cold water lines have hot water.
If other faucets have hot water in both lines, then that tells you the blockage is localized in furthest faucet supply lines.
You may have to dissemble those supply lines and flush the sediment out.

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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

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My Grundfos Comfort System is not working. I has been installed correctly....the pump is running, I checked and replaced the valve....still no immediate hot water. The installation instructions...


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.

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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.

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