Error Code
LF error code — Gecko spa
Always cut power at the breaker before opening the spa pack or touching wiring. Spa equipment runs at 120/240V and can be lethal. If you are unsure, hire a licensed spa technician.
Gecko's LF is the low-flow warning before a full FLO lockout. Catch it here and the fix is almost always the filter or the switch.
What LF means
Low flow detected during heater operation.
Diagnose in order
- Pull and inspect the filter cartridge — a clogged filter is the most common cause by far
- Bleed any air lock at the pump union until water runs steady
- Test the pressure/flow switch — a $15–30 part and an easy DIY swap
- Verify every diverter valve is fully open
- Listen to the circulation pump — humming with weak jet flow means it's failing
- Only then suspect the heater — a heater replaced on top of a flow problem fails again in weeks
Likely failed parts
Frequently asked questions
Related codes & guides
Not sure which part failed?
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