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Hi Jay,</div>
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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.</div>
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<div><span style="font-size:small; color:rgb(34,34,34); font-family:arial,sans-serif">Cordially,</span><br>
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<a href="https://enphase.com/en-us/products-and-services/envoy" class="OWAAutoLink" style="font-family:arial,sans-serif; font-size:13px"><b style="font-size:large">Powering What\u2019s Next</b><font face="arial, helvetica, sans-serif">\u2122</font><font size="4"><i> | </i>The
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Bob-O <rekindaguy@yahoo.com><br>
<b>Sent:</b> Friday, February 25, 2022 8:21 AM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Subject:</b> Re: [RE-wrenches] grundfos cu200 failure?</font>
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<div>Jay, I agree it\u2019s probably a controller failure but double check your float wiring, especially if it\u2019s 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.
<div><br>
<div dir="ltr">Bob-O</div>
<div dir="ltr"><br>
On Feb 24, 2022, at 8:12 PM, Jay <jay.peltz@gmail.com> wrote:<br>
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<div dir="ltr">\ufeff
<div dir="ltr"></div>
<div dir="ltr">Yes. </div>
<div dir="ltr">And if that light is on it\u2019s 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\u2019s supposed to shut off the pump. </div>
<div dir="ltr">And it\u2019s not. </div>
<div dir="ltr"><br>
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<div dir="ltr">I\u2019ve just never seen this failure mode before. </div>
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<div dir="ltr">Jay</div>
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<blockquote type="cite">On Feb 24, 2022, at 8:48 PM, Mac Lewis <maclewis1@gmail.com> wrote:<br>
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<div dir="ltr">Hi Jay,<br>
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<div>Have you ruled out a problem with the float switch/wiring?</div>
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<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Thu, Feb 24, 2022 at 5:13 PM jay <<a href="mailto:jay.peltz@gmail.com">jay.peltz@gmail.com</a>> wrote:<br>
</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
HI All,<br>
<br>
Has anyone seen this failure mode on a Grundfos CU200.<br>
<br>
The tank full light is on and it keeps pumping ( green arrows working)<br>
<br>
I suspect the CU200 just needs to be replaced, but as they are pretty pricy I\u2019d thought I\u2019d ask around first.<br>
<br>
thanks<br>
<br>
jay<br>
<br>
<br>
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