Pumps definitely on, have not changed the elevation of the reservoir. The only thing I can think of is a faulty sensor but doing a search comes up with zero people having that issueAny change in the elevation of your reservoir? I found out when I installed mine that my reservoir was creating a siphon and over filling the tank. Is it the pump on for sure?
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And yes the siphon break is installed and correctly
Your probably right about clogged but definitely wasn't below the water line. Any who it's working now so I'm not messing with itI'm going to guess that this was either clogged or below the reservoir waterline.