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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 t …