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Hello I have a Grundfos circulating pump #UP1542F on my system. It recently started making this high pitched whistling sound for about one minute than quits. It seems to only do it on start up / when

Grundfos recirculating pump #UP1542F sku# 59896155.this pump is on my hot water heating system.

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  • 3,382 Answers

I do not know your system but It sounds like a restriction forming in the system. It may be calcium deposits or a valve not closing properly.

Posted on Jun 17, 2014

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6 Suggested Answers

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 1114 Answers

SOURCE: My new AO Smith 2HP pool pump won't pump water, just hums

I'm guessing that you replaced the motor that goes to the pump, not the pump itself. You know the motor works just fine. Is the motor rotating in the correct manner(clockwise or counterclockwise) in relation to the rotation of the pump? Have you checked the pump to see if the impeller is working/rotating? Is the motor hooked up to the pump correctly, so that the motor is turning the impeller? Are all connections to the pump tight, so there are no suction leaks? Have you primed the pump and purged it of any air locks?

Posted on Aug 11, 2009

  • 9 Answers

SOURCE: Noise from hot water circulating pump

could you have gotten air into the line and now the pump cavitates?

Posted on Sep 08, 2009

Testimonial: "Thanks a million. Makes alot of sense. How do we get the air out?"

  • 1 Answer

SOURCE: Grundfos UPS 25-50 180 - start up

These days it happened to me but it was an electrical problem, but mechanical..When you loosen the center screw, you should try to turn the pump house with the help of a screwdriver (to the right and left) in turn means that the water was blocked by limestone, which is unlocked after you do water to pass through screw without to see if it turns on its own. The water that comes out is very little if it works then closes the screw .. good luck

Posted on Nov 06, 2009

  • 234 Answers

SOURCE: New grundig pump is now making a kind of clicking

I was ready to pass your question and go to the next person because you said it was making a clicking, and I could not relate or diagnose that type of sound for that kind of pump. Thank God I decided to read to the end where you said rattling sound. that is what you should have said in the beginning.
1st, did you replace the pump cartridge or the whole pump unit? 2nd, is the pump in a different oriented position than the original pump position? The inner cartridge floats inside the pump as it rotates and if it is in an oriented position that allows it to bounce (to & frow) it will make this rattle sound; not serious but can be annoying. It is was a replacement cartridge, perhaps the new gasket and the old gasket are in place, thus allowing too much space for the cartridge and it therfore moves too much and rattles. Or, if it was replaced as a whole new unit. there is a problem with it that you should not be responsible for, except for the positioning orientation. Finally, if there is still too much air in the system, the air bubbles will jossle the cartridge untill you get rid (bleed ou ) the remaining air. Goodluck<Macgivor

Posted on Jan 02, 2010

  • 151 Answers

SOURCE: my sump pump is making a loud humming sound and is

if the pump is 220v make sure that both fuses in the unit are on. If both fuses/breakers are good and the unit isn't pumping water the unit may have froze up. Remove the power from the unit and try to manually rotate the motor shaft at an attempt to free it up. If that doesn't seem to work the bearings may need to be replaced.

Posted on Jan 17, 2010

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1 Answer

What electrical part is connected to the capacitor inside a grundfos up15-42f circulating pump?


Hugh sadly as a retired Heating engineer I think you may be easier to buy a new heating pump as these things are not on the market to purchase.

Aug 02, 2014 | Grundfos Pumps Grundfos UP15-42F 1/25 HP...

1 Answer

I have low pressure at house, There is no problem


I am just guessing but it appears there is a restriction such as a partally closed valve.

Sep 01, 2013 | Grundfos Pumps Grunfos UP15-42F 1/25 HP...

1 Answer

Hot water at showers is intermitent while shower is on


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

Set timer so pump is off when shower time arrives
Check for crossover
Check if installation is correct... is the crossover valve installed correctly?

Gene

Feb 02, 2012 | Grundfos Comfort System Recirculator ...

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

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 ...

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

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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