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    Grundfos CU 200 Always Pumping

    I have a solar setup with a generator backup. CU200 SQFlex with a IO 101 SQFlex Switchbox.

    I recently found the tank overflowing. The CU200 is showing a full tank, is indicating water flow and the power switch is ON. The power switch is unresponsive. It will not shut off. To stop the water pumping I have to shut off the IO 101.

    I've checked all the connections. Disconnected the Float Switch. No changes. My take is that the circuit board is fried and I need to buy a new controller.

    Does anyone have any suggestions? I'm at a bit of a loss here.

    Thanks in advance.
    Last edited by patbob; 03-10-2017 at 02:04 PM.

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