Below is my simple ATO reservoir program. RO line is always ready to deliver water through solenoid - so on is filling.
There are two mechanical float sensors - Res_LO and RES_HI
Fallback OFF
If Res_Lo OPEN Then ON
If Res_Hi CLOSED Then OFF
When On > 090:00 Then OFF
If Leak CLOSED Then OFF
I cant figure out why the outlet in going ON right now - because Res_Lo is CLOSED and Res_Hi is OPEN
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