[RE-wrenches] grundfos cu200 failure?

[Bob-O]

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