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| Error codes & messages | Descriptions |
| Balboa Error Codes | |
| pd | Power supply, unit running on battery back up |
| OH | Sensors reading 112-118 degreesF |
| Flo | Improper flow or pressure switch malfunction |
| Cool | Water temp 20 degreesF below set point |
| ICE | Potential freeze condition has been detected |
| Sn 1 | Hi-limit sensor malfunction |
| Sn 3 | Temp sensor malfunction |
| ILOC | Interlock failure - possible pump or ozone spike |
| Brett Error Codes | |
| OH | Temp exeeds 118 degreesF |
| Fr | Freeze condition - temp below 40 degreesF |
| FL | Pressure switch failure |
| EO | Shorted temp sensor |
| E1 | Open temp sensor |
| E2 | Shorted hi-limit sensor |
| E3 | Open hi-limit sensor |
| E4 | Shorted flow switch |
| E7 | Improper electrical connection |
| FC (message) | Filter cycle |
| Gecko error codes (old style) | |
| FLO | Pressure switch open |
| FLC | Pressure switch closed |
| Prr | Temp sensor failure |
| Prh | Hi-limit sensor failure |
| FrE | Possible freeze condition |
|
Gecko error codes (new style) |
|
| 32degF | Temp sensor not detected |
| 112degF flashing | Water too hot; let cool down & system will reset itself @ 109degF |
| 3 flashing dots on display | Water flow problem check for closed valves, dirty filters, water level, pump/wetend operation defective pressure switch |
| Flashing dots & light lit on circuit board | Hi-limit trip. Reset power to clear |
| Inverted display | Press filter key for 5 seconds (certain models only) |
| Pump starts by itself for 1 munute on several occasions & filter indicator flashing | Smart winter mode not an error but a feature (freeze protection) |
| Filter cycle has stopped & "filter" indicator is flashing not an error but a feature; either the filter cycle is in a 40 minute time-out to avoid ozonater activation while spa is being used or the system has cancelled a filter cycle after 3 hours because water temp exceeds set point by more than 2degF | |
| "Heater" indicator flashes when pump is on high speed. Not an error but a feature. The system is turning off the heater when pump is on high speed to limit amperage draw (jumper 1 set to LC mode) | |
| Temperature displays water temp "C" or "F". Simply hold light button for 5 seconds to toggle. | |
| Technical note: After making any changes to any P.C.B or control system; RESET the breaker | |
| Hercules error codes | |
| OH | Spa temp exceeds acceptable limits |
| FLO | Flow problem |
| ICE | Freeze condition detected |
| SN1 | Hi-limit sensor failure |
| SN2 | Temp sensor failure |