Hi, Pea-Jay
The fresh water measurement system measure the electrical conductivity of several metallic rods of different lenghts inserted in the water tank from the top.
Each tank has a single measurement assembly connected to the panel with a flat electrical cable of 5 wires.
You can locate the panel connection (rear view), the two squared connector located at the lower right corner of the green panel.
Possible checks:
- disconnect (pull) one by one the squared connector, the indicator should display empty tank.
- swap the two connector, to check any difference in reading
- if disconnecting the plug, the display goes to zero, then you need to check the wiring and the sensor head (where the rods are)
- locate the rods head, inspect for moisture, clean outside. Eventually disconnect wires (take note of color-connection) remove from the tank and clean and remove hany moisture.
This measurement system is affected by humidity and moisture, but it is really simple.
P.S. when disconnecting the squared connectors, take note of the position since there might be some difference in calibration.