Troubleshooting Your Salt Chlorine Generator Flow / No Flow Indicator

Among the warning lights found on Saltwater Chlorine Generators (SCG) is almost invariably a “No Flow” light, sometimes labeled “Check Flow,” “Flow Fault,” or even simply “Flow.” In all cases, there are several things to understand upfront.

The first idea to embrace is that it is usually indicating that the system detects inadequate flow. Even though you see or know that the water is flowing, the flow may be inadequate to safely generate chlorine, or the flow measurement circuit is faulty.

The second point is that, common to other SCG lights, a red light means “stop” just as it does with traffic lights. In this case, it specifically means that the system has stopped chlorine generation.

Possible Causes

Waterflow Related

• Excessive filter pressure or other blockage
• Pump speed too low (Variable Speed Pump)

Equipment Related

• Flow switch oriented incorrectly
• Debris caught on switch mechanism
• Broken or faulty parts (Cable, Flow Switch, Socket/PCB)

Diagnostics & Solutions

• Check Filter Pressure: Check that the filter pressure is not elevated to levels that signify it is time to clean or backwash the filter, typically about 7-10 lbs over the “clean pressure.” Clean or backwash the filter if needed.
• Adjust Pump Speed: Raise the pump speed until the warning light turns off.
• Verify Switch Orientation: Check for a marking on the flow switch indicating proper orientation relative to the waterflow. Occasionally, a slight adjustment in one direction or the other will turn off the red warning light.
• Inspect for Debris: Remove the switch and inspect for debris, damage, and free movement of the mechanism. Note that debris is often dislodged by the removal process.
• Inspect the Cable: Check the cord for damage or kinks, then disconnect and reconnect it. Note that while a damaged cord is theoretically repairable, repairs are generally unsuccessful.
• Manual Switch Test:
• If the Control Module can be powered on without the pump running: Remove the switch and then open and close it manually to verify whether the light will turn off.
• If the Control Module is only powered on when the pump is running: Rubber band or twist tie the switch closed. Reinstall the switch and test whether the light turns off.
• Results: If the light goes "Off," you have a genuine "No Flow" condition and pump speed may need to be raised (unless a blockage is remedied). If the light stays "On," you likely need a new flow switch.
• Internal Component Failure: If a replacement switch still gives a red light, contact the manufacturer to arrange for service and repair. The problem is most probably due to a fault or failure in the PCB or socket.

Additional Resources

Brand-Specific Resources, including manuals and contact information.

If we haven’t led you to and solved your issues, then we advise you to call us at (866) 766-5243 Mon-Thu: 9-4:30 or Fri: 9-3PM Central and a member of our support team will assist you further. Alternatively, request assistance online and you will be contacted by a support team member.