afaik those level sensors send their signals and these are used for both functions.



You might want to simply disconnect the rods for testing what's going on. Obviously there will be no adjusting by the system untill you manually change the rod's position a bit and see if the system reacts.


You might be able to read out the sensor's data in INPA. Disconnect, readout, manually change a position, readout and so on. See what's going on.



I wouldn't exchange the sensors before knowing for (as) sure (as possible) that they are the cause. Because they break easily and are not free. Plus you would still have the issue.