Grundfos Float Switch
I recently used a Grundfos float switch in a storage tank being filled by a SQ Flex subpump. I installed a CU200 smart box as well through which the float switch shuts off power to the pump when the tank is full. It's a 5,000 gallon tank and at the time of the installation the shallow well was producing only 1/2 gal/min. I verified everything was working and went on my merry way. Several months later I got a call from the contractor that will be building a home at this remote site and was told that water was coming out of the CU200. Long story short, the pump did not shut off when the float switch went into a vertical position and the tank eventually filled to the point water was entering the float switch wire conduit and going into the CU200. It's a helical rotor pump and apparently they don't let water flow back into the well, so the water had continued to rise pass the fill pipe and into the conduit. Has anyone heard of these float switches sticking? The CU200 is still operational, but the display on the front cover no longer works and the whole thing will have to be replaced.
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