Question about Grundfos JPS4 1 HP Pressure Booster Pump

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My grundfos pump auto-reset light is on...but water is not coming out of the faucets...however if I leave the faucet on and turn the pump off and on, it works well until I turn the faucet off again

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  • Joel Friedenberg May 11, 2010

    Does the pump have a pressure switch hooked up to it?

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  • 16 Answers

Check air press in built in tank.

Posted on Dec 08, 2009

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I do not have water is it the grundfos?


Probably not the pump if you have no water at all.
If you have no hot water, the problem is probably water heater.
If you have no instant hot at faucet, then pump timer or thermostat could be problem, or maybe pump is getting no power or pump has gone bad or crossover piece with check-valve (located under sink) has failed
http://waterheatertimer.org/Water-heater-recirculation-system.html

Gene

May 12, 2014 | Grundfos The UP1510B5ATLC 125th HP 1...

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

I have a Grundfos Comfort System. At the tap farthest from the hot water tank, I get a tremendous amount of grainy residue from the tap. No other taps have the residu. I've replaced teh water softener,...


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.

Dec 30, 2010 | Grundfos Comfort System Recirculator ...

1 Answer

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.

Dec 30, 2010 | 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

With the water running the MQ pump runs intermittently


This is a problem with your bladder in the pressure tank or the pressure switch. Ether one will produce this cycling on and off. Good luck.

Mar 09, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...

1 Answer

Grundfos recirculating retro fit hot water out of the cold side


they have it installed wrong it is pulling from the wrong side, it is supposed to pull ot water up to the fixture but then if it stays hot on the cold side they are backwards

May 27, 2009 | Grundfos RCP-96 Recirculation Pump for...

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