Troubleshooting; Ph Out Of Range; Ph Low; Ph High - Hayward CAT 4000 Owner's Manual

Troubleshooting

pH Out Of Range

pH is measured on a scale ranging from 0 to 14, with pH 7.0 considered neutral. pH below 7.0 is
considered acidic and above 7.0 is alkaline. pH is a significant variable in determining water quality
as it affects sanitizer activity, color, and human compatibility with the water. The proper pH range
for swimming pools and spas is between 7.2 and 7.8.

pH Low

A pH below 7.2 will cause corrosive water resulting in possible damage to the filtration components
and pool surface as well as bather discomfort. First, test the pool/spa water with a phenol red pH
test kit. If the pH on the test kit agrees with the controller and the pH is below 7.2, check the pH
correction chemical level. If the manual test does not agree with the controller clean the sensor.

pH High

A pH above 7.8 will cause scaling on the pool surface, plumbing, and filtration equipment as well
as cloudy water, inefficient use of sanitizer and bather discomfort. First, test the pool/spa water
with a phenol red pH test kit. If the pH on the test kit agrees with the controller and the pH is above
7.8, check the pH correction chemical level. If the manual test does not agree with the controller
clean the sensor.
pH Overfeed
The pH Overfeed timeout occurs when the CAT 4000 has been feeding chemicals for a time
greater than the selected maximum feed time and has not reached its setpoint. A properly selected
Overfeed timeout prevents the unit from continuing to feed chemicals when the chemical supply
has been diminished or a chemical feeder has become clogged or broken. First, check the chemi-
cal supply and chemical feeder. If both are in order, check the Overfeed timeout setting as it may
need to be increased to keep up with chemical demand.
pH Tank Low
The pH Tank Low alarm will sound when the chemical being fed falls below the optional optical
level sensor in the tank. First check the chemical level. If the level is above the sensor, check the
sensor for obstruction or scaling.
ORP Out Of Range
Oxidation Reduction Potential is a measure of the oxidizing capacity present in water. Unlike a DPD
chlorine reading, which can only differentiate between free available chlorine and the less effective
combined chlorine, ORP provides an accurate measure of water quality regardless of pH, TDS,
cyanuric acid, or non- chlorine oxidizers. The proper ORP range for swimming pools and spas is
between 650 and 800 mV, with any value above 650 resulting in healthy water quality.
ORP Overfeed
The ORP Overfeed timeout occurs when the CAT 4000 has been feeding chemicals for a time
greater than the selected maximum feed time and has not reached its set point. A properly selected
Overfeed timeout prevents the unit from continuing to feed chemicals when the chemical supply
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