Calcium Reactor won't turn on

[Tcook]

Starting this reactor up after 10 years. Changed the coding a bit. Was running until reactor pH dropped below 6.5. Now reactor pH is 7.9 and has not turned back on. pH is the sump probe. ph_Ca is the reactor. Current sump pH is 8.13.

Fallback OFF
If pH < 7.90 Then OFF
If pH_Ca < 6.50 Then OFF
Defer 001:00 Then ON
If FeedA 000 Then OFF
If Leak_R CLOSED Then OFF

 

[ATAquariums]

That looks wrong, but I’m not an apex guru. You want to run your ca reactor between 6.8.-6.5 (lower melts the media faster). On when it goes above desired # and off when at that #. This is the ph probe inside the reactor which will tell the regulator to let co2 in or stop it.

 

[Tcook]

So I need an ON statement for the reactor? (If pH_Ca >6.8 then ON). I thought once the reactor pH goes above 6.5 then the OFF statement is no longer valid.
@SuncrestReef

 

[SuncrestReef]

Starting this reactor up after 10 years. Changed the coding a bit. Was running until reactor pH dropped below 6.5. Now reactor pH is 7.9 and has not turned back on. pH is the sump probe. ph_Ca is the reactor. Current sump pH is 8.13.

Fallback OFF
If pH < 7.90 Then OFF
If pH_Ca < 6.50 Then OFF
Defer 001:00 Then ON
If FeedA 000 Then OFF
If Leak_R CLOSED Then OFF

You need to tell it to turn ON when the pH is GREATER THAN, not LESS THAN:

Fallback OFF
If pH > 6.80 Then ON
If pH_Ca < 6.50 Then OFF
Defer 001:00 Then ON
If FeedA 000 Then OFF
If Leak_R CLOSED Then OFF

See my series of Apex Tutorials for more tips and examples:
https://www.reef2reef.com/ams/authors/suncrestreef.93940/

 

[Tcook]

Ok, I added that on statement and it is working now. The " If pH < 7.90 Then OFF" is for the sump probe incase the reactor was stuck in the on position. Should I remove that line? Glad you guys are here to help out.

Fallback OFF
If pH < 7.90 Then OFF
If pH_Ca > 6.80 Then ON
If pH_Ca < 6.50 Then OFF
Defer 001:00 Then ON
If FeedA 000 Then OFF
If Leak_R CLOSED Then OFF