Well thought I'd follow up on this, better late than never. So the pump was shutting off after a period of time, and the FLO error was the result of this.
I opened the spa pack and was lucky enough to see some overheating damage one of the cube relays. There's a 2nd identical relay that is used for 2 pump spas, so I took it off and replaced the melted one and that solved my problem. Needed to be handy with a solder iron but not overly difficult