ATO using three sensors

[jimdoniom]

if you use "ATO with 2 sensors" sensor 2 will automatically have the backup function for sensor 1
-> then sensor 1 and sensor 2 determine the state of water 1 - nothing more to do, just use this mode

for the third sensor: use for level 3 mode "return pump"

after you did the above we can continue

I have now done that the levels 1 and 2 appear to work correctly, and I have set level 3 up as return pump but I keep getting an alarm on level 3.

I'm not sure if I need to add something else maybe in programmable logic but I am lost again

it is from here that I am not sure what to do next, I would like to set it so that I only get an alarm if the third sensor shows the water level in the top up container is too low... but from what the other poster says it does not appear possible ? is there a work around or is it something that may be fixed in a future version?