L1
Coast Spas
Low-Speed Pump / Circulation Pump Failure
Display shows L1 or LOW1; low-speed pump or circulation pump not detected.
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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
Failed circulation pump on Coast Spas, Open winding on low-speed of Pump 1, Loose pump wiring, Faulty low-speed relay on control board
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker before accessing pumps or wiring.
- Listen for operation: When the spa calls for heat or filtration, listen for the circulation pump or low-speed pump. Silence indicates a failure.
- Check wiring connections: Verify that the pump leads are firmly attached to the correct terminals on the control pack.
- Measure voltage: A qualified person can check for proper voltage at the pump terminals when it should be running. If voltage is present but the pump does not run, replace the pump.
- Board issue: If no voltage is present and the spa is calling for circulation, the control board relay may be defective.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump
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