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 <re-wrenches-boun...@lists.re-wrenches.org> on behalf of Bob-O <rekinda...@yahoo.com> Sent: Friday, February 25, 2022 8:21 AM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> 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 <jay.pe...@gmail.com> 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 <maclew...@gmail.com> wrote: Hi Jay, Have you ruled out a problem with the float switch/wiring? On Thu, Feb 24, 2022 at 5:13 PM jay <jay.pe...@gmail.com<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. 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