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Grundfos ch2-50 is running but it wont stop when the water is not used

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This sounds like you have a pressure switch issue.
You can adjust the pressure sensor once you have not load on the pump to stop. If you adjust it and it fails to still shut off than I suggest you replace the pressure switch.

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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SOURCE: Grundfos pump switches on & off continuously with

if you have a pump for the whole house you need to check the bladder tank. there is a air valve on the top. Check the pressure with a tire gauge you should have at least 20 PSI this will stop the pump from the on and off thing.

You can compress air yuo can not compress water. thats why the ballder tank. As the pump work to shut off pressure it is compressing air. then when you use a little water the pump does not run until a large about is run then the pump will re fill the system

Best of luck

R J

Posted on Sep 08, 2011

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Grundfos water pump MQ3-45B. Will stop after frequent use. I have to turn it off and on to reset it. Control panel?


I would first check to see if any valves are partially closed, increasing the run time of your pump and causing over heating. Next I would check for any possible obstructions to water flow.

Grundfos pumps are designed to shut down when they are at risk of overheating and burning out which requires a manual reset. This can also be caused by insufficient water in the system, so you may want to bleed out any air that may be in it.

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1 Answer

Grundfos pump problems


There are several possibilities here. All involve water pressure. The first is that you have a water leak between the pump and where the water is going to.
The second is that the pump is not getting enough water to it so it is sucking air well as water in an attempt to give you water perssure. This could be caused by not having an inline "one way" valve on your supply line just before the pump ($30.00).
The third involves two little screws on the control where your electical connection is. These two screws control the high and low pressure settings of your pump. If your high setting is too high the pump will simply keep running trying to do the impossible, If there is not enough difference between the high and low setting the pump will also keep on. running.
Another possibility is that the pump has had debris (sand, dirt, mud, etc) sucked through it and has damaged either the housing or more likely the impeller that spins the water creating the pressure.Ther is also an internal seal that can be damaged by debris.
The final possibility is that the pressure control unit with the two little screws I mentioned earlier has failed and is deffective.

Most importantly if the pump is running hot please stop using it! You are at risk of fire and possibly the loss of your home and loved ones. Grundfos pumps can be serviced by a professional technician, Parts are readily available and not extremely expensive. I would not recommend doing it youself if it is the pump.as some specialty tools may be involved depending on the problem. You will become frustrated very quickly.
A fast solution is to buy one of the cheap plastic pumps ($169.00) made in China. They are amazing for the price and will run with no problems for years if your water is free of debris. Fixing your Grundfos may run you the same amount and you maybe without a pump for a week or more depending on the technicians work load.
I am not saying "Don't fix your Grundfos" but you don't need to be in a panic about it either.

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Grundfos pump problems


I've just had a ideal i35 boiler fitted, the grundfos ump3 economic pump has failed / seized and has been replaced 4 times since the boiler was installed 7 months ago.
It has just stopped working again and ideal are refusing to attend.
any advise would be appreciated.

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1 Answer

Grundfos pump switches on & off continuously with


if you have a pump for the whole house you need to check the bladder tank. there is a air valve on the top. Check the pressure with a tire gauge you should have at least 20 PSI this will stop the pump from the on and off thing.

You can compress air yuo can not compress water. thats why the ballder tank. As the pump work to shut off pressure it is compressing air. then when you use a little water the pump does not run until a large about is run then the pump will re fill the system

Best of luck

R J

Sep 05, 2011 | Plumbing

1 Answer

I have a Grundfos MQ booster pump and it starts and stops while the water is in use instead of continuing to run until after the water is turned off. The manual says that it could have air the lines or...


Get a good tire pressure gauge insert it into the bottom of the tank, you should read about
12psi-20psi., depending on your system. If you get no reading or unstable reading, morethan likely you need to add air. Try to add air, if it wont accept it find a place to bleed water out
of the system. Is this a water heater or a boiler?

Sep 03, 2011 | Grundfos Plumbing

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

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