FLC
Strong Spas
Flow Switch Closed When It Should Be Open
Display shows FLC or FL2 and heater will not run
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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
Stuck flow switch contacts, Shorted flow switch wiring, Incorrectly installed or bypassed flow switch, Control board input fault
How to Fix / Troubleshooting
Safety first: Turn off power at the GFCI breaker. Never bypass safety devices for normal operation.
Steps to troubleshoot FLC/FL2:
- Inspect wiring: Open the equipment bay and locate the flow switch wiring harness. Check for pinched, rubbed, or shorted wires and repair as needed.
- Check the flow switch body: Ensure the flow switch is installed in the correct orientation and that no one has mechanically locked it closed.
- Test continuity: With power OFF, disconnect the flow switch from the control board and use a multimeter to check continuity across the switch. With no flow, the switch should be open (no continuity). If it reads closed, the switch is stuck and must be replaced.
- Replace the flow switch: Drain the spa below the level of the switch or clamp the lines. Remove the old switch and install a Strong Spas-compatible replacement with new seals. Reconnect wiring to the same terminals.
When to call a technician: If a new flow switch does not clear FLC, the control board may have an internal fault and should be evaluated by a professional.
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Repair Difficulty
Hard
4/5
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