It can only be three different things you've got air in the line or your pressure tank which is called the exterol tank could be losing pressure you might need a new air gauge pressure gauge on your tank or number three you have a leaky faucet somewhere or like I said air in the line if I had more details I could tell you exactly what it was
- changes in hydraulic conditions (clogged pipes, clogged filter, ...)
- pressure switch failure
- flow sensor failure
(in normal condition the pump starts when the consumption is higher than 1.2 l/min or the pressure is lower than 2 bar)
https://www.manualslib.com/manual/1569763/Grundfos-Mq-3-35.html?page=1#manual
Hi Hayley.
Please allow me to try to help you.
Random water pumping or intermittent water pumping, appears to be quite a commonality with the Grundfos pump. The solution to this is quite a bit of process, the details of which you can get here...
http://inspectapedia.com/water/Intermittent-Water-Pump-Cycling.php
I have also attached a video, trust that gives you a bit more insight.
Hope that helps.
Best wishes. Regards.
New pump? Or old? Previously used pumps sometimes get stuck. They do not have a lot of starting power and very little debris or rust can keep it from running. Remove the 4 Allen head bolts from the motor to volute. Spin impeller by hand. Should have no resistance. If that's good reinstall and try again. If you have verified power to the pump and it is still not working get a new pump.
ideal are required to fix under warranty any part that continually fails
(check with a lawyer)
as it is a possible design error or improper installation, the company is obliged to rectify the problem
while grundfos is the preferred installation pump and the problem is related to the pump the company in an effort to ensure customer satisfaction should be making an arrangement to fit a different brand of pump or rectify the cause of the pump failure
as I stated --discuss the matter with the company and a lawyer to resolve the issue
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.
