Short answer: FLO and FLC are flow/flow-switch warnings. Check water level, filters, valves, pump movement, and the filter/skimmer area first. If the code returns after one breaker reset and basic checks, it may need service.
Contents
FLO vs FLC
Code |
Plain-English meaning |
First checks |
|---|---|---|
FLO |
The system is not seeing expected water flow while the pump should be moving water. |
Water level, filter restriction, valves, air lock, pump movement. |
FLC |
The flow switch is reading closed when it should not be. |
Breaker reset once, then flow-switch state/service if it returns. |
ER 00 / ER 01 |
Newer Custom Series numbered flow-code family. |
Use same flow-first troubleshooting logic. |
Step-by-step checks before calling a technician
- Turn power off at the breaker for 20–30 seconds, then restore power once.
- Confirm water level is high enough for proper skimmer flow.
- Remove and inspect filters. Rinse obvious debris and check whether water flow improves.
- Look for closed valves or blocked intake/skimmer areas.
- Confirm the pump actually starts and moves water.
- If the code returns, stop guessing and consider flow-switch, pump, or service-level causes.
Where filters fit into FLO/FLC troubleshooting
Filters are a common first check because they are easy to inspect and can restrict flow. If your current Pro Filters are clogged, collapsed, greasy, or hard to rinse clean, they can become part of the problem. For compatible tubs, the Arctic Spa filter replacement guide explains replacement options.
When the adapter path helps
The adapter does not magically fix a broken flow switch or pump. It helps when the recurring owner problem is the proprietary filter path itself: hard-to-source replacements, messy cleaning, or filter restriction that keeps coming back. If your tub matches the compatibility requirements, switching to compatible generic filters can make ongoing maintenance easier.
Related guides
- Full Arctic Spa Error Code Guide
- Filter Not Present / Filter Purge Warning
- Pro Filters vs Generic Filters
Next step: If your tub is a 2020+ Arctic Spas Custom Series spa with the matching Pro Filter setup, see Spa Filter Adapter Kit v3 to switch to compatible generic replacement filters.
FAQs
What does FLO mean on an Arctic Spa?
FLO means the spa is not detecting proper water flow while the pump should be moving water. Start with water level, filter restriction, valves, and pump movement.
What does FLC mean on an Arctic Spa?
FLC usually means the flow switch is reading closed when it should not be. Reset once, then check whether the switch or related wiring needs service if it returns.
Can dirty filters cause FLO or FLC?
Dirty or blocked filters can contribute to low-flow conditions and should be checked early. FLC can also point to a flow-switch state problem, so persistent FLC should not be treated as only a dirty-filter issue.
Should I keep resetting the breaker?
No. One reset is reasonable. If the same code returns, troubleshoot the cause instead of repeatedly cycling power.
Can the adapter fix every flow code?
No. The adapter helps compatible owners move to a generic-filter path. It does not repair pumps, valves, wiring, sensors, or stuck flow switches.
References
This guide is an independent aftermarket support resource. Spa Filter Adapter is not affiliated with or endorsed by Arctic Spas. Official Arctic Spas support/manual pages were used as references and linked nofollow below.