"Power" LED not on. Check to make sure either 120VAC or 240VAC input power is connected to the proper screw terminals at the Aqua Rite control. Verify input voltage with a voltmeter. If there is input power, the fuse may have blown. The Aqua Rite is protected by a 20 amp mini ATO fuse located on the circuit board above the cell connector.
"No Flow" LED illuminated. The Hayward Aqua Rite has sensed a no flow condition and has stopped generating chlorine. Check that the flow switch is plugged into the connector on the bottom of the control unit and that the wire is not cut or damaged. Make sure you have at least 12" of straight pipe before the flow switch. If there is adequate flow and the LED is still on, check that the arrows on the flow switch (on top of hex) are pointing in the direction of flow.
Causes for little or no chlorine residual. The Hayward Aqua Rite switch is in the "Off" position. The Desired Output % adjustement setting is too low. The stabilizer (cyanuric acid) level is low. The filter pump time is too short (8 hours is average). The salt level is too high or too low (ideal 3200 ppm). The water temperature is warm and this causes a higher demand for chlorine. The water temperature is too low (below 50ºF) and this causes the Aqua Rite to stop generating. There is excessive scaling on the cell. Note: Any one of these problems will cause a little or no chlorine residual.