How to Fix the Sundance Spa "FLO" Error

Is Your FLO Error Flashing or Solid?

A "FLO" error is the most common message on a Sundance control panel. To fix it, you first need to identify which type you have:

  • Flashing FLO (or FL1): This means the system wants to see water flow but can’t. This is usually caused by a dirty filter, an air lock after a drain-and-fill, or a Flow Switch stuck in the "open" position.
  • Solid FLO (or FL2): This means the system thinks there is flow even when the pumps are off. This is almost always a sign that the Flow Switch has physically failed or is "shorted" closed.

The 2-Minute "Filter Test"

Before buying a new Circulation Pump, try this:

  1. Turn off the power at the breaker.
  2. Remove your filter cartridge.
  3. Turn the power back on.
  4. If the error disappears, your filter is clogged. If it stays, it's time to check your Flow Switch or the heater circulation pump

Shop Sundance Spas Flow Switch

Shop Sundance Spas Circulation Pump

Jan 17th 2026 SpaStore.com

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