Display shows FLO2 or FLOW2 and spa may shut down heater; often occurs during high-speed jet operation.

Safety: Turn off power at the breaker before removing panels or touching internal components.

• Verify valves are open: Check all RivieraPool slice valves near the pump and heater. Ensure they are fully pulled up/open. A partially closed valve can trigger FLO2.
• Bleed air: After a refill, air pockets can cause false flow readings. Loosen the pump union slightly until water seeps out, then retighten. Restore power and run jets to purge air.
• Inspect for debris: Remove the filter cartridge and run the spa briefly (1–2 minutes) without the filter to see if the error clears. If it does, replace or deep-clean the filter.
• Check the high-flow switch: Locate the RivieraPool high-flow/pressure switch on or near the heater manifold. Inspect wiring for corrosion or loose connections. With power OFF, gently tap the switch body; if the error intermittently clears, the switch may be sticking and should be replaced.
• Persistent FLO2: If the error remains after these steps, the high-flow switch or associated wiring is likely faulty and should be replaced by a qualified technician.