FLC
Dynasty Spas
Flow Switch Stuck Closed / Shorted
Display shows FLC (flow closed) even when the pump is off, or heater will not engage and spa will not heat.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Defective flow switch stuck in closed position, Shorted flow switch wiring harness, Control board input fault for flow circuit
How to Fix / Troubleshooting
Safety first: Shut off power at the GFCI breaker before working inside the equipment bay.
- Visual inspection: Open the Dynasty Spas equipment compartment. Locate the flow switch in the plumbing near the heater tube. Inspect for cracked housing, corrosion, or damaged wires.
- Check wiring: Ensure the two-conductor cable from the flow switch to the control pack is not pinched or rubbed through. Reseat the connector on the control board.
- Basic test: With power off, disconnect the flow switch from the control board. Restore power briefly. If the FLC code changes to FLO or another flow-related code, the switch is likely stuck closed and should be replaced.
- Replace flow switch if needed: Drain water below the level of the flow switch. Unscrew or cut out the old switch assembly and install a compatible Dynasty Spas flow switch in the same orientation (arrow in direction of flow). Reconnect wiring, refill, bleed air, and test.
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Repair Difficulty
Medium
3/5
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