Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
The biggest cause of FL-1 error code is a dirty filter. Turn off breaker remove filter completely from spa then turn breaker back on if FL code does not appear replace the filter. If this does not solve issue then you have a bad flow switch which is located next to the heater it is a see through "T" with a sensor inside follow wires from sensor back to circuit board and then replace that sensor.
Ok sounds good let me know if it all is good.