Staff Answer
Oct 21, 2026 - 07:08 AM
The salinity reading may show 0000 PPM at various points during the system's operation (especially the realtime salinity reading found in the diagnostic menu, which can show this frequently depending on what % output setting you are using). Please see the following to better understand what you might be seeing.
If no warning lights are displayed on the Control Module:
In the diagnostic menu, the instant salinity reading will show zero any time power is not passing through its cell, including many periods throughout the day when the system's duty cycle is in a rest mode (the system cycle's its chlorine generation on and off regularly throughout the day as described in the manual). No action is typically required.
If warning lights are displayed on the Control Module:
Similarly, if a warning light triggers, the system stops passing power through the cell, and the instant salinity will read zero. Depending on the warning light, consult the troubleshooting section of your manual or the system's troubleshooting guide (available here). While the warning light is active, the average salinity will continue to read that the levels measure up until that point; if the warning light is allowed to persist for a long enough time, the average level may also eventually display zero. Once the issue is resolved and the warning light goes away, the system's operation will be restored.
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