LF
Aquaterra Spas Persistent Low Flow Condition

Display shows LF or LOW FLO, spa may shut down heater after repeated low-flow detections.

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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

Severely clogged filter, Air lock that will not clear, Failing circulation pump, Obstruction in suction or return plumbing

How to Fix / Troubleshooting

Safety first: Turn off power at the GFCI breaker.

  • Run without filter: Remove the filter cartridge and run the spa briefly (with the filter well cover in place) to see if LF clears. If it does, replace the filter.
  • Bleed air thoroughly: Loosen both pump unions and heater unions one at a time until all trapped air is released and only water flows.
  • Check for obstructions: Inspect the skimmer and suction fittings for debris. In the equipment bay, look for crushed or kinked hoses.
  • Evaluate pump performance: If flow remains weak, the circulation pump impeller may be worn or blocked, requiring pump replacement or rebuild.

Persistent LF errors after these steps indicate a mechanical flow problem that should be addressed by a spa technician.

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Repair Difficulty

Hard 4/5

Required Part

Circulation Pump
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