The fluid level sensors are mounted on the outside of the tank. The black water seems to be inoperative. When the tanks are empty, all the lights except the bottom one are out. Now, the lights are staying out, no matter how much liquid is in the tank.
Now, if the tank was dirty, with stuff stuck to the inside, wouldn't it follow that the lights would be on all the time?
I was wondering if any of you have had experience with these eternally mounted sensors, and what you did to fix them.
The photo is just for reference, right now, both tanks are empty.