[RE-wrenches] grundfos cu200 failure?

Fri Feb 25 15:17:38 EST 2022

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

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California C10 Licensed Electrician #986315

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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Bob-O <rekindaguy at yahoo.com>
Sent: Friday, February 25, 2022 8:21 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] grundfos cu200 failure?

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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.peltz at 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 <maclewis1 at 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.peltz at gmail.com<mailto:jay.peltz at 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

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