How to Troubleshoot a Grundfos SQE Using the CU 301 Indicator Lights
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- čas přidán 26. 01. 2023
- Follow the step-by-step explanation in this video to use all of the indicator lights of the CU 301 control for troubleshooting of the Grundfos SQE constant pressure submersible waterwell pump.
- Věda a technologie
Question about the indicators. At 6:30 when you've reconnected the sensor, we can see that the "Sensor Defective" light goes out. But then at 6:32 -- just as you're starting to point at the "Sensor Defective" light -- the "Pump" light goes solid red. From a troubleshooting standpoint, should we take any notice if that does or doesn't happen? The "Pump" alarm gets cleared at 6:43 by the ON/OFF switch, and the cideo's over, but I'm left with the question: Are alarm lights are *always" significant with respect to their own indicated condition? ... Or might they sometimes be merely innocent glitches due to changes in other alarm conditions (such as shown in this video)? Have you any guidance as to how a troubleshooter should consider it? Thank you!
Hi Ronnie,
Thank you very much for your question. The pump light is actually the "No contact to pump" alarm, which is an additional safety feature in the CU301, if the sensor signal is lost or out of range, CU301 disconnect power to the pump to make sure it does not run at all. This is to avoid overpressure situation. There is a small delay between the alarms happening and the relay disconnecting the pump, which is more of a timing issue in the video, than a real concern.
Let me know if you have any other questions! :)
Kind regards, Sofie
Hello, I just installed a SQE pump in my well. Currently it is using a mechanical 40/60 pressure switch and 33 gallon pressure tank. I'd like to use the CU 301 to get constant pressure feature. Can I use the CU 301 with the 33 gallon pressure tank? The tank is in perfect working condition. Thanks.
Hi,
Your already installed SQE pump will operate on a CU 301 being installed at this time. We recommend a smaller tank from 2-gallon or 5-gallon so the Pressure Transducer (Sensor), the CU 301 Controller, and the signal to the motor operate properly. We respect using a perfect working condition 33-gallon pressure tank already installed to avoid the cost of a smaller second tank and installation. If you choose that option, when installing the CU 301 controller, please run the system through all the operations (testing) and keep a close eye on the system operations for a time to be sure it is operating properly on the 33-gallon tank. If the system runs but won’t shut off or cycles on-and-off when not using water, you will have to replace the 33-gallon tank with a 2-gallon or 5-gallon tank. Thank You for asking!!! :)
Best regards,
Steph
I bought a house with a well and all this equipment is in it. I know nothing about it other than it seems to be working. For some preventive maintenance we are replacing the manifold at the bottom of the Well Mate pressure tank (WM 25) as well as a new bladder. However, the people I plan on getting this stuff from tell me I don't need a huge pressure tank with this system and to just get a smaller tank, much like the one (I assume) in your video. Not knowing anything about this system, does this advice sound right? Perhaps at some point in my home's history (the Well Mate WM 25 is 2001 model), this Grundfos was added in place of a traditional pressure switch, and I do not in fact need a huge pressure tank. Thank you in advance for your comments.
Hello Grant, thanks for reaching out to us and for your question.
It sounds right that your house has worked with another pump system before that requires a larger pressure tank. With CU 301 and a SQE you can use much smaller tanks - down to 2 gallons. It is common in US to use 4 gallons tanks with CU301.
I hope this helps you a bit! Let me know if you have any other questions.
Kind regards, Sofie
@@grundfos thank you, but what is an SQE and how do I know if I have one?
Hi again! If you have a CU301, it will only operate with SQE :-)
Kind regards, Sofie
I’m have a question i have a cu 301 and im getting a no connection light and pump still works . Do i have to enter the squ number off pump?
Hi Evan,
If the controller is “old” and the SQE has been replaced it might need a renumbering, it can also be a “wrong” pump meaning SQ and not SQE.
Grounding could also be a concern or even installation of cables, it is important that input power to CU 301 is separate from pump cable, they may not be tied together.
Also, if you are located in the US, you can call our Groundwater Contractor Hotline who can assist with troubleshooting this CU301 over the phone.
Hotline number: 844-824-8953. They are open 8-5pm CT. :)
We hope this helps.
Best regards,
Steph
I am replacing my old 220V pump with a 115V Grundfos 10SQE05-160 for my log home, do I need a CD301?
Yes, you need a CU301 controller for all models of SQE.
i have a red light at the no contact to the pump what does this mean?
Hi Betty,
The permanent red light next to “No contact to pump” indicates that the CU301 is not able to communicate with the electronics in the pump. The communication between these devices is done through the power cables. There are multiple potential causes for this communication error. A list of potential causes and solutions can be found on page 23 of the CU301 Installation and operating instructions. These instructions can be downloaded here gfos.ly/6056efX3n
We hope this helps :)
Thank you,
Steph
All three of my DC supply lights are blinking yellow. My front panel has no lights on at all.
Actually they are blinking green.
What about the 24v overload light being red the one just to the left of the 5v sensor, what does that mean?
Hi, The 24v overload light being red indicates the pump’s motor is in “Overload” condition. If the motor has not failed yet, it will soon, if not corrected.
To provide more information as to what to look for causing the overload condition. Please consider contacting the Contractor that installed the system to troubleshoot the solution.
Or, If you want to contact internal Customer Service, you can call PH # 844-994-2850, or email support-GPU@sales.grundfos.com
Here are some topics the Contractor or Customer Service will consider.
The definition of “Overload” and the red light coming on is “pulling too much amperage.”
Some common causes of pulling too much amperage:
Low voltage to motor.
You can check the voltage when the pump is off and again when the pump is on. You should not see a significant drop in voltage. If there is a significant drop in voltage, then the motor running is receiving low voltage and is overloading on amps.
Loose connections, damaged or broken wire.
Some applications can build up scale, iron deposits, or sand in the pump. This slows it down, makes it bind, or negatively reduces performance, where the motor pulls higher amps to try and overcome the problem.
For more information, reach out to your Contractor or Customer Service for more information. I hope this helps 😉 -Steph
The Grundfos System installed 1.5 years ago- no longer keeps constant pressure- operates like a conventional hi/lo system- air tank has perfect pre-charge still- 35 PSI- read manual- something about need to reset after 1000 stops?? Any advice to get back to constant pressure operation as seen when first installed? Thank you
Hi John,
The reset that you are referring to the manual is if the “No Contact to Pump” light is also illuminated. Are there any other lights that are illuminated or has anything in the system changed? I would recommend contacting our support team internally who may be able to set up a call to help troubleshoot more in-depth. They can be contacted at
support-us@sales.grundfos.com
We hope this helps :)
Best regards,
Steph
@@grundfos Thank you- I'll contact support team...
Sounds great! :)
What about no power to the box? I lost water and went to the well head and there is no power there on the box.
Main breaker is still on.
Hello Johnny,
Thank you for reaching out to us. I understand your concern regarding the CU301. It's important to note that even if the breaker appears to be in the "on" position, it doesn't necessarily guarantee that power is being supplied to the CU301 unit. To ensure everything is functioning correctly, it would be best to have a professional pump installer or electrician examine your system. They should check to confirm that the breaker is working properly, the wiring to the box is intact and securely connected, and that there is indeed power reaching the CU301 through the terminal lugs.
If after these checks, everything seems in order but you're still experiencing issues, it's possible that the CU301 unit itself may be faulty and in need of replacement. Please let us know how these checks go, and we can assist you further if necessary.
Best regards,
Steph
@@grundfos Yeah it was under warranty. They came out and tested it and it was bad. some moisture was in there and they swapped it. Thanks for responding.
Great! We are so happy you were able to get that resolved. 🙂 Please feel free to reach out with any other questions. Have a great day!
Best regards,
Steph
Can this be programmed without the remote control?
Hi,
Yes. The CU301 controller's front face plate has indication lights and push buttons that guide you through programming and reading the controller without the Grundfos GO Remote.
Thank you,
Steph
How do I program the type of pressure sensor used and the pressure range?
Hi Watdahel,
To make any changes to the preset system you would need to connect the CU301 with the Grundfos Go Remote also known as the MI301. We hope this helps. :)
Best regards,
Steph