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Grundfos cu301 pump not pumping. worked fine. Red light on at bottom of pressure gage and readout.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Grundfos submersible well pump with Grundfos CU301

Grundfos is a p. o. s. I have a new system cu 301 and I have had to get it repaired twice by Fogle Pump and Supply. These guys are real rip of artists in Washington State and should be reported to the BBB. Dont Use Fogle if you need a well

Posted on Sep 30, 2010

  • 1 Answer

SOURCE: Hello, My Grundfos CU301 pump

We had a similar problem, and the CU301 had failed. We just got a new one, so I figured I could take apart the old one without making things worse, and I discovered that the 82 ohm 4 watt power resistor had failed. I don't know if that's the only problem, but that resistor has infinite resistance now. So I ordered a couple of new 5 watt ones from newark.com for 15 - 44 cents (on sale). I'll put one in and let you know if that fixes our old CU301. Nothing else on the board looks blackened or swollen or smells bad.
The new CU301 is only able to communicate with the pump intermittently, so I'm not sure what all is wrong. If I have too much more trouble, I'm going to switch to a Cycle-Stop Valve and get rid of the electronic controllers.

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Posted on Jan 02, 2011

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We had a similar problem, and the CU301 had failed. We just got a new one, so I figured I could take apart the old one without making things worse, and I discovered that the 82 ohm 4 watt power resistor had failed. I don't know if that's the only problem, but that resistor has infinite resistance now. So I ordered a couple of new 5 watt ones from newark.com for 15 - 44 cents (on sale). I'll put one in and let you know if that fixes our old CU301. Nothing else on the board looks blackened or swollen or smells bad.
The new CU301 is only able to communicate with the pump intermittently, so I'm not sure what all is wrong. If I have too much more trouble, I'm going to switch to a Cycle-Stop Valve and get rid of the electronic controllers.

small-logo.png

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Grundfos is a p. o. s. I have a new system cu 301 and I have had to get it repaired twice by Fogle Pump and Supply. These guys are real rip of artists in Washington State and should be reported to the BBB. Dont Use Fogle if you need a well

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