Low or no chlorine
residual in pool
(Also cloudy water, green
pool)
Insufficient Chlorine Output Level
Increase Output Level. This is often
required seasonally with increasing
temperatures.
Increase run time to at least 1 hour
per 10° ambient temp.
Heavy pool use, inclement weather,
organic matter
Activate SUPER CL MODE or
chemically shock pool.
Water chemistry issues:
Low Chlorine Stabilizer
Low salt in pool
Phosphates in pool
Nitrates in pool
Contact pool professional, ensure all
chemicals on page 8 are within range.
Cell is dirty, clogged, or has excessive
scaling or mineral build-up
Remove Cell from plumbing, inspect
and clean (see page 12).
Inactive unit, power is off
Turn on system, or see “No Power”
Low or no Chlorine residual
in pool after recent
installation
Water chemistry was not balanced
prior to system installation and a
high chlorine demand persists
Contact pool professional, ensure all
chemicals on page 8 are within range,
chemically shock pool if necessary.
System hasn’t been running
Double check all connections, verify
system runs in sync with circulation
pump.
System is connected to
incorrect voltage and is not
operational
Have a professional test power
source and ensure correct
connection.
Power LED flashing and
Service LED on
Low salt level in pool
(Less than 3500 ppm)
Test salinity and add salt if necessary
(see page 6-7).
Clean Cell (see page 12).
Turn off until above 60°.
Check pump, filters, and valves for
operation. Ensure sensor in cell is
clean, and that cell is completely full
of water (no air bubble is present).
Continued on next page. For more information or troubleshooting, visit www. circupool.com/help
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