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Possible causes :
The pH minus container is empty.
pH sensor needs to be cleaned and calibrated.
pH sensor is faulty.
Selected pool size setting is too low
The peristaltic pump is defused.
Solutions :
- Replace the pH minus container if it is empty.
- Clean, then calibrate the pH sensor (see chapter 8 / ‘pH & ACL sensors cleaning’ and 4.1 / ‘pH sensor
calibrating procedure’).
- Check the pool size setting (see chapter 4.3 / ‘Setting the pool size’).
- Check the peristaltic pump operation (see chapter 3.8 / ‘Testing / Priming the peristaltic pump’).
Hold the (SELECT) button for 3 seconds to erase an error code (when it blinks).
10.4/ ‘ACL LOW’
Meaning :
Water disinfectant poser is too low (ACL). Free chlorine level into pool’s water is probably too low. A
manual free chlorine analysis should be done before proceeding.
Possible causes :
Water pH is too high.
Total alkalinity (TAC) is too low, which means an unstable pH.
ACL set point is too low.
A high bather load has generated a high chlorine demand.
ACL sensor needs to be cleaned and calibrated.
ACL sensor is faulty.
Solutions :
- Manually check the pH value to be sure that pH regulation operates correctly.
- Check total alkalinity (TAC) and adjust it if necessary (see chapter 7 / ‘Water balance’).
- Increase the ACL set point (see chapter 4.5 / ‘ACL set point ‘).
- Clean, then calibrate the ACL sensor (see chapter 8 / ‘pH & ACL sensors cleaning’ and 4.1 / ‘pH sensor
calibrating procedure’).
- Replace the ORP 700 mV buffer solution, then calibrate the ACL sensor.
- If necessary, replace the ACL sensor.
10.5/ ‘ACL HIGH’
Meaning :
Water disinfectant poser is too high (ACL). Free chlorine level into pool’s water is probably too high. A
manual free chlorine analysis should be done before proceeding.
Possible causes :
Water pH is too low.
Total alkalinity (TAC) is too low, which means an unstable pH.
ACL set point is too high.
Swimming pool has been covered and/or unused during a long period (cover, shelter, cold climate…).
ACL sensor needs to be cleaned and calibrated.
ACL sensor is faulty.
Solutions :
- Manually check the pH value to be sure that pH regulation operates correctly.
- Check total alkalinity (TAC) and adjust it if necessary (see chapter 7 / ‘Water balance’).
- Decrease the ACL set point (see chapter 4.5 / ‘ACL set point ‘).