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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! That error code means there is trouble with the pressure switch circuit. If the switch has been replaced, I suspect the tube may be plugged. If you remove that hose from the pressure switch and blow through it (the hose), does air easily pass?
If it is slow to fill it can cause that error code so cleaning the softener tray would be prudent.