Staff Answer
Oct 12, 2026 - 01:25 PM
If your CircuPool RJ-PLUS is showing a solid red "no flow" light despite normal pump operation, check the following. This will confirm whether the flow switch component itself has an issue or whether it is operating properly and there is something causing it not to be triggered.
You can test and confirm the flow switch's operation with the following process. You will do this by manually triggering the flow switch to see if its no flow light goes out or not; this can be done in the following two ways. If you are able to power just the salt chlorinator, you can unscrew the flow switch from its housing, hold the switch together with your fingers, then power the system on and continue to hold the flow switch together; alternatively, if your can't power just the salt system, then with the pool equipment off unscrew the flow switch and then bind it together temporarily with something like a rubber band, xxxx it back into the flow switch housing, turn the equipment on.
Once the salt system is on and the flow switch is being manually triggered, wait to see what happens on the controller. If the flow switch component itself is good, this will be confirmed after you see the no flow light flash for a minute or so and then eventually go out. If this does not happen, then the flow switch likely needs to be replaced. If the no flow light does go out when manually triggered, then this identifies that the issue at hand is something that has to do with the flow happening in the pipes. For example, if a variable speed pump is running at too low of RPM's or if the flow switch is not turned to face in the right direction within its housing so that water flow triggers it, that could be a similar type of issue. If you need troubleshooting, please contact our support team, or let us know if you have more questions.
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