Gecko spa error codes — full list and fixes
Found in: Beachcomber, Arctic Spas, Master Spas, some Sundance, Catalina, Caldera, Dimension One and many more
Know your code? Jump straight to it with the decoder →
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.
All Gecko codes
| Code | What it means | Fix |
|---|---|---|
| HL | High Limit — water exceeded safe temperature; heater locked out. | View fix → |
| FLO | Flow problem — heater on but no flow confirmed. | View fix → |
| AOH | Ambient overheat — the equipment cabinet is too hot. | View fix → |
| OH | Water temperature over set point plus safety margin. | View fix → |
| SP IN | Spa input pressure switch problem. | View fix → |
| 4HR | Filter cycle exceeded 4 hours of high-speed pump run. | View fix → |
| COM | Communication error between topside and main board. | View fix → |
| NO Co | No communication from topside to control box. | View fix → |
| PROG | Programming error during setup or firmware operation. | View fix → |
| LF | Low flow detected during heater operation. | View fix → |
| Pr | Priming mode — purging air after power-up. | Normal behaviour — no part needed |
| SC | Self-cleaning cycle active. | Normal behaviour — no part needed |
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