Re: [RE-wrenches] grundfos cu200 failure?
I have about 1200 ft from float switches, two in parallel, to the CU200 and another 200 ft to the pump without any issues. If there is bad connection it could be a problem though. Brad Sent from my iPhone > On Feb 25, 2022, at 12:17 PM, Nick Soleil wrote: > > Hi Jay, > > Is it a long wire length? I had a similar issue with a Aquavar Solo2 pump > controller recently where the float switch was not turning the pump off. The > wire length from the float switch to the pump controller was over 300ft and > ran underneath an electric line. I believe that a small (2V) was being > induced into the control wiring and that 2V signal appeard as a closed > circuit to the pump controller. I used the float switch to control an > external contactor. The external contactor switched a short length of wire > on the pump controller's dry contactor and that resolved the issue. > > Cordially, > Nick Soleil > Enphase Energy > Senior Product Manager > (707) 763-4784 x7267 // office > (707) 321-2937 // cell > Powering What’s Next™ | The Enphase Energy Management System > NABCEP Certified Solar PV Installer #03262011-300 > California C10 Licensed Electrician #986315 > > From: RE-wrenches on behalf of > Bob-O > Sent: Friday, February 25, 2022 8:21 AM > To: RE-wrenches > Subject: Re: [RE-wrenches] grundfos cu200 failure? > > EXTERNAL EMAIL - Use caution when responding, clicking, and/or downloading > attachments. > > > > > Jay, I agree it’s probably a controller failure but double check your float > wiring, especially if it’s been in service for awhile. The current required > to activate that circuit is minuscule. A little corrosion or a loose > connection can make that controller do funny things. > > Bob-O > > On Feb 24, 2022, at 8:12 PM, Jay wrote: > > > Yes. > And if that light is on it’s supposed to stop pumping. Even if the float was > bad or maybe the wires were bad, if the cu200 is seeing a full tank signal > it’s supposed to shut off the pump. > And it’s not. > > I’ve just never seen this failure mode before. > > Jay > > > >> On Feb 24, 2022, at 8:48 PM, Mac Lewis wrote: >> >> >> Hi Jay, >> >> Have you ruled out a problem with the float switch/wiring? >> >> On Thu, Feb 24, 2022 at 5:13 PM jay wrote: >> HI All, >> >> Has anyone seen this failure mode on a Grundfos CU200. >> >> The tank full light is on and it keeps pumping ( green arrows working) >> >> I suspect the CU200 just needs to be replaced, but as they are pretty pricy >> I’d thought I’d ask around first. >> >> thanks >> >> jay >> >> >> ___ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> >> >> -- >> >> >> >> Mac Lewis >> >> "Yo solo sé que no sé nada." -Sócrates >> >> ___ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > ___ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Chang
Re: [RE-wrenches] grundfos cu200 failure?
Hi Jay, Is it a long wire length? I had a similar issue with a Aquavar Solo2 pump controller recently where the float switch was not turning the pump off. The wire length from the float switch to the pump controller was over 300ft and ran underneath an electric line. I believe that a small (2V) was being induced into the control wiring and that 2V signal appeard as a closed circuit to the pump controller. I used the float switch to control an external contactor. The external contactor switched a short length of wire on the pump controller's dry contactor and that resolved the issue. Cordially, Nick Soleil Enphase Energy Senior Product Manager (707) 763-4784 x7267 // office (707) 321-2937 // cell Powering What’s Next™ | The Enphase Energy Management System<https://enphase.com/en-us/products-and-services/envoy> NABCEP Certified Solar PV Installer #03262011-300 California C10 Licensed Electrician #986315 From: RE-wrenches on behalf of Bob-O Sent: Friday, February 25, 2022 8:21 AM To: RE-wrenches Subject: Re: [RE-wrenches] grundfos cu200 failure? EXTERNAL EMAIL - Use caution when responding, clicking, and/or downloading attachments. Jay, I agree it’s probably a controller failure but double check your float wiring, especially if it’s been in service for awhile. The current required to activate that circuit is minuscule. A little corrosion or a loose connection can make that controller do funny things. Bob-O On Feb 24, 2022, at 8:12 PM, Jay wrote: Yes. And if that light is on it’s supposed to stop pumping. Even if the float was bad or maybe the wires were bad, if the cu200 is seeing a full tank signal it’s supposed to shut off the pump. And it’s not. I’ve just never seen this failure mode before. Jay On Feb 24, 2022, at 8:48 PM, Mac Lewis wrote: Hi Jay, Have you ruled out a problem with the float switch/wiring? On Thu, Feb 24, 2022 at 5:13 PM jay mailto:jay.pe...@gmail.com>> wrote: HI All, Has anyone seen this failure mode on a Grundfos CU200. The tank full light is on and it keeps pumping ( green arrows working) I suspect the CU200 just needs to be replaced, but as they are pretty pricy I’d thought I’d ask around first. thanks jay ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org<https://urldefense.com/v3/__http://re-wrenches.org__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8bUbTPGA$> List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<https://urldefense.com/v3/__http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8UkX9HWg$> There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/<https://urldefense.com/v3/__https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8W1LArr0$> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<https://urldefense.com/v3/__http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8qYaLUyI$> List rules & etiquette: http://www.re-wrenches.org/etiquette.htm<https://urldefense.com/v3/__http://www.re-wrenches.org/etiquette.htm__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8MOdw8vU$> Check out or update participant bios: http://www.members.re-wrenches.org<https://urldefense.com/v3/__http://www.members.re-wrenches.org__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8P1s5OGc$> -- Mac Lewis "Yo solo sé que no sé nada." -Sócrates ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org<https://urldefense.com/v3/__http://re-wrenches.org__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8bUbTPGA$> List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<https://urldefense.com/v3/__http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org__;!!J0D89H32QIeNiQ!ljV_a-OGpoSq0U0Q9P7eTq0auYj5jDo8AIVu8Zs9M7E7gO30OBI7MM5oYUi8UkX9HWg$> There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/<https://urldefense.com/v3/__https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/__;!!J0D89H32Q
Re: [RE-wrenches] grundfos cu200 failure?
Hi Jay, It may be cheaper to try to use an interrupt relay to shut off the pump. Tricky though for solar direct like these. As far as I can tell, Grundfos tech support doesn't exist. On Fri, Feb 25, 2022 at 8:34 AM Bradley Bassett wrote: > Jay, > > As I remember, that is the classic failure mode. We used to see it now and > then, more often than we liked. It's why I used to recommend always getting > the extended warranty. And, it can be either the CU200 or the pump itself. > It might also be a corroded connection between the two. > Brad > > On Thu, Feb 24, 2022 at 8:12 PM Jay wrote: > >> Yes. >> And if that light is on it’s supposed to stop pumping. Even if the float >> was bad or maybe the wires were bad, if the cu200 is seeing a full tank >> signal it’s supposed to shut off the pump. >> And it’s not. >> >> I’ve just never seen this failure mode before. >> >> Jay >> >> >> >> On Feb 24, 2022, at 8:48 PM, Mac Lewis wrote: >> >> >> Hi Jay, >> >> Have you ruled out a problem with the float switch/wiring? >> >> On Thu, Feb 24, 2022 at 5:13 PM jay wrote: >> >>> HI All, >>> >>> Has anyone seen this failure mode on a Grundfos CU200. >>> >>> The tank full light is on and it keeps pumping ( green arrows working) >>> >>> I suspect the CU200 just needs to be replaced, but as they are pretty >>> pricy I’d thought I’d ask around first. >>> >>> thanks >>> >>> jay >>> >>> >>> ___ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. When one doesn't work, try >>> the other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >>> >> >> -- >> >> >> >> Mac Lewis >> >> *"Yo solo sé que no sé nada." -Sócrates* >> ___ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> ___ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> ___ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates* ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant
Re: [RE-wrenches] grundfos cu200 failure?
Jay, As I remember, that is the classic failure mode. We used to see it now and then, more often than we liked. It's why I used to recommend always getting the extended warranty. And, it can be either the CU200 or the pump itself. It might also be a corroded connection between the two. Brad On Thu, Feb 24, 2022 at 8:12 PM Jay wrote: > Yes. > And if that light is on it’s supposed to stop pumping. Even if the float > was bad or maybe the wires were bad, if the cu200 is seeing a full tank > signal it’s supposed to shut off the pump. > And it’s not. > > I’ve just never seen this failure mode before. > > Jay > > > > On Feb 24, 2022, at 8:48 PM, Mac Lewis wrote: > > > Hi Jay, > > Have you ruled out a problem with the float switch/wiring? > > On Thu, Feb 24, 2022 at 5:13 PM jay wrote: > >> HI All, >> >> Has anyone seen this failure mode on a Grundfos CU200. >> >> The tank full light is on and it keeps pumping ( green arrows working) >> >> I suspect the CU200 just needs to be replaced, but as they are pretty >> pricy I’d thought I’d ask around first. >> >> thanks >> >> jay >> >> >> ___ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> > > -- > > > > Mac Lewis > > *"Yo solo sé que no sé nada." -Sócrates* > ___ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > ___ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
Re: [RE-wrenches] grundfos cu200 failure?
Yes. And if that light is on it’s supposed to stop pumping. Even if the float was bad or maybe the wires were bad, if the cu200 is seeing a full tank signal it’s supposed to shut off the pump. And it’s not. I’ve just never seen this failure mode before. Jay > On Feb 24, 2022, at 8:48 PM, Mac Lewis wrote: > > > Hi Jay, > > Have you ruled out a problem with the float switch/wiring? > >> On Thu, Feb 24, 2022 at 5:13 PM jay wrote: >> HI All, >> >> Has anyone seen this failure mode on a Grundfos CU200. >> >> The tank full light is on and it keeps pumping ( green arrows working) >> >> I suspect the CU200 just needs to be replaced, but as they are pretty pricy >> I’d thought I’d ask around first. >> >> thanks >> >> jay >> >> >> ___ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > > > -- > > > > Mac Lewis > > "Yo solo sé que no sé nada." -Sócrates > > ___ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
Re: [RE-wrenches] grundfos cu200 failure?
Hi Jay, Have you ruled out a problem with the float switch/wiring? On Thu, Feb 24, 2022 at 5:13 PM jay wrote: > HI All, > > Has anyone seen this failure mode on a Grundfos CU200. > > The tank full light is on and it keeps pumping ( green arrows working) > > I suspect the CU200 just needs to be replaced, but as they are pretty > pricy I’d thought I’d ask around first. > > thanks > > jay > > > ___ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates* ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
