What does FLO indicate? - Pool & Spa

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That's the thermal overload shutting the motor off. It generally indicates a problem in the bearings or motor windings. The usual fix is to replace the motor.

This is usually an indicator that the high speed on your pump is bad.
Rod
US Parts Center

The error code FLO indicates that there is NOT enough water flow through the system to operate the spa and make the heater turn on.
Check your spa filter by removing it. If the heat indicator comes on then you can be assured your filter is too dirty.
If the heat indicator light does NOT come on after removing the filter then you need to check the PRESSURE SWITCH by by-passing the switch and see if the heat indicator light comes on. If it comes on after jumping the two wires together that go to the pressure switch then you know you have a bad pressure switch.
Also, check the gate valves on either side of the pump to make sure they are completely up and you have good water flow.


Rod
US Parts Center
888-521-6183

If you don't have any error codes, FLO, FLC, then there is a chance your heater has burnt out. You would need an Ohm meter to measure if you have continuity thru the heater element. You should read 11 to 12 ohms. If you have either FLO or FLC on the display this indicates a problem with the pressure switch. The pressure switch is threaded into the side of the heater, the stainless steel tube attached to the #1 or main pump. Its a round module with two wires attached to it. There is an adjusting post in the center of the module. For an FLO code turn the post half a turn CCW. For an FLC code turn it half a turn CW. If this does not solve the problem replace the pressure switch.

A "FLO (w)" indicator means that there is insufficient water flow to trip the pressure switch and allow the heater to come on. Trouble Shooting: Remove the filters and run the spa. If the indicator goes away the filters are clogged, bad. Locate the pressure switch normally threaded into the heater tube. There should be two wires attached. Remove the wires and connect them together to complete the circuit. If the indicator goes away the pressure switch is bad or requires adjustment. Replace / adjust the switch and reconnect the wires. Do not run the spa permanently without it.

Assuming that pump 1 works ok on low speed...

Try removing the filter(s) and see whether or not this clears the fault. If the fault has gone install some new filters.

you may have a bad pressure switch.if you are getting flow thru the heater and this code is comeing on there are only two reasons.No flow or bad switch.