[RE-wrenches] grundfos cu200 failure?

[Bradley Bassett]

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 <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> 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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> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
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