Short answer: What Filter Not Present means depends on which filter setup is in the spa. If you still use the stock Arctic Spa Pro Filters, start with filter placement, seating, and condition. If you use Spa Filter Adapter Kit v3, the warning is expected and will remain displayed.
First, identify which filter setup you have
| Your setup | What Filter Not Present usually means | Where to start |
|---|---|---|
| Stock Arctic Spa Pro Filters | The spa is not recognizing the expected stock filter setup. | Check placement, seating, alignment, and the physical condition of the filters and skimmer components. |
| Spa Filter Adapter Kit v3 | The warning is expected whenever Kit v3 is installed. | Do not repeatedly reseat the adapter to clear the warning. It will remain displayed with Kit v3. |
If you have the stock Arctic Spa Pro Filters
With the original stock Pro Filters installed, Filter Not Present is usually a reason to inspect the physical filter setup first. A filter that is sitting high, tilted, loose, in the wrong position, or interfering with a skimmer component may prevent the expected setup from being recognized.
Stock Pro Filter placement checklist
- Turn the spa off before handling filter or skimmer components.
- Confirm the correct stock Pro Filter is installed in each filter position for your model.
- Make sure each filter is straight, fully seated, and not sitting high or tilted.
- Check that skimmer covers, handles, baskets, and nearby components are installed correctly and are not holding a filter out of position.
- Inspect for debris, damaged threads, a loose cartridge, or a collapsed filter that could affect fitment.
- Confirm the water level is high enough for normal skimmer and circulation operation.
- Restore power and check the message again.
If the stock filters appear correctly placed and the warning remains, use the instructions for your exact Arctic Spa model or contact Arctic Spas support. Do not replace pumps, sensors, or flow switches based on Filter Not Present alone.
If you use Spa Filter Adapter Kit v3
Filter Not Present is expected whenever Spa Filter Adapter Kit v3 is installed. The warning will remain displayed even when the adapter and compatible generic filters are installed correctly. Reseating the adapter or generic filters will not clear it.
The warning by itself does not mean Kit v3 is loose, installed incorrectly, or preventing water flow. Continue to monitor normal circulation, heating, water level, water clarity, and any separate error codes.
Filter Not Present vs a real flow problem
Filter Not Present is not the same as FLO, FLC, ER 00, or ER 01. Owners using either the stock Pro Filters or Kit v3 should troubleshoot further when the warning appears with weak circulation, heater shutdown, dirty water, unusual pump behavior, or a separate flow code.
| What you see | Likely category | What to do |
|---|---|---|
| Filter Not Present with stock Pro Filters | Stock filter placement or detection | Check filter position, seating, fitment, and skimmer components first. |
| Filter Not Present with Kit v3 | Expected Kit v3 status | The message will remain. Monitor normal spa operation. |
| FLO, FLC, ER 00, or ER 01 | Flow or flow-switch condition | Use the flow-code guide and correct the underlying circulation issue. |
| CLE | Cleaning reminder | Inspect and clean the filters as part of normal maintenance. |
For real flow symptoms, use the Arctic Spa FLO/FLC code guide or the full Arctic Spa error code guide.
Related guides
Considering Kit v3? If your tub is a compatible 2020+ Arctic Spas Custom Series spa and you understand that Filter Not Present will remain displayed, see Spa Filter Adapter Kit v3 to use compatible generic replacement filters.
FAQs
What does Filter Not Present mean with stock Arctic Spa Pro Filters?
With the stock Pro Filters installed, start by checking placement, seating, alignment, and filter condition. A filter or skimmer component that is out of position may prevent the expected stock setup from being recognized.
What should I check first with the stock Pro Filters?
Turn the spa off, then confirm the correct filters are in the correct positions, fully seated, straight, and not being held up by a skimmer cover, basket, handle, debris, damaged threads, or a collapsed cartridge.
Will Filter Not Present go away with Spa Filter Adapter Kit v3?
No. Filter Not Present is expected whenever Spa Filter Adapter Kit v3 is installed. Reseating the adapter or generic filters will not clear the warning.
Does Filter Not Present mean Kit v3 is installed incorrectly?
No. The warning by itself is expected with Kit v3. Check the installation only if you also have weak circulation, leaking, loose components, dirty water, or another operating problem.
Is Filter Not Present the same as FLO or FLC?
No. Filter Not Present concerns the filter setup or expected Kit v3 status. FLO and FLC are separate flow-related warnings that require circulation troubleshooting.
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 are linked below for general filtration and filter-replacement reference.