pH control

[mmillerr2018]

I'm trying to set an output to turn my CO2 solenoid on at 7pH and off at 6pH but no matter what settings I try it will turn off at 6 and not turn back on as the pH rises above 6 or it will turn on at 7 and not turn off at 6.
Basically I'm looking to maintain the pH as close to pH6 as possible during the scheduled hours.

Help?

 

[Danny]

Post a screenshot of you settings. One setting is the turn on setting and other is the turn off setting. So one will turn it on and it will stay on until it hits the turn off setpoint. Then it will stay off until it hits the turn on setpoint. This in normal.