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good morning. I have the same system. I have fought it for seven years on and off. I found that good brass barbed couplers and good check valves to be important. to keep it working. mine now works really good but when the outside temps rise my black tank is on and off. when Brian Gabel and I reflashed my system he said my water board was reading a little odd but said as long as it was working no big deal. also I blow low air pressure into tank sensors that cleans the sensor and has helped. good luck. system maybe a relative to our air leak issues. HA HA.