Zodiac TRi pH Module - User Manual

Questions and Answers

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Joshua AdamsAug 12, 2025
How to fix 'PH LOW' on my Zodiac TRi pH Module Control Unit?
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  Kathryn PhillipsAug 12, 2025
  If your Zodiac Control Unit displays 'PH LOW', it means the measured pH is 0.8 units or more below the set point. First, verify the pH level in your pool and the set point configuration. You may need to calibrate or replace the pH sensor. Also, ensure that the pH sensor is clean and calibrated and that the pH7.5 buffer solution is fresh. Finally, confirm that the selected pool size setting is correct.
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Alison SalazarAug 20, 2025
What to do if my Zodiac Control Unit displays 'PH ERROR'?
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  jenkinsamyAug 20, 2025
  If your Zodiac Control Unit shows 'PH ERROR', it indicates that pH adjustment has run for 5 cycles without reaching the set point (over 10 hours). Begin by checking the pH in your pool. You might need to calibrate or replace the pH sensor. Ensure the pH minus container isn't empty and that the peristaltic pump is primed and working. Also, verify that the pH sensor is clean and calibrated, and replace the pH7.5 buffer solution if needed. Check that the selected pool size isn't too small. If the peristaltic pump hasn't operated for 72 hours, it might mean the pH doesn't need correction.
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Erin LeeAug 27, 2025
Why does my Zodiac Control Unit show 'ACL HIGH' and how to resolve it?
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  Amanda JohnsonAug 27, 2025
  If your Zodiac Control Unit displays 'ACL HIGH', it means the measured Redox potential is more than 150 mV above the set point, potentially indicating excessive chlorine. You can clean and calibrate the sensors, or wait for the error message to disappear, which will halt chlorine production. Ensure the stabilizer level is below 30 ppm, reduce the ACL set point, and verify that the water isn't overly mineralized (avoid bore-hole water).
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Mrs. Amanda SanchezSep 4, 2025
What should I do if my Zodiac TRi pH Module Control Unit shows 'ACL ERROR'?
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  ebrowningSep 4, 2025
  If your Zodiac Control Unit displays 'ACL ERROR', it means chlorine production has been running for 30 hours without reaching the ACL set point, or the chlorinator hasn't produced chlorine for 30 hours. Start by checking the pH in the pool. Clean and calibrate the sensors, and replace the buffer solutions if needed. If problems persist, consider replacing the sensors. If necessary, use the 'boost' mode. Also, check the chlorine level in the pool.