- Turn the purifier off and unplug it from the wall. Wait 60 seconds, then plug it back in and switch on to see if the LED/alert stops flashing.
- Open the unit and remove the main filter(s). Inspect the filter for heavy dust, blockages or incorrect seating. If visibly dirty, replace or clean according to the manual (use a replacement genuine AEG filter where required).
- Check the air inlets/outlets and the base for obstructions (drapes, furniture, dust build-up). Move the purifier to a clear area with at least 30 cm clearance and try running it again.
- If the LED still flashes after the above, perform a factory reset (if available) or power-cycle the unit again. If there's a visible filter replacement indicator, ensure the indicator was reset after fitting a new filter.
AEG AX91-604 error code Air purifier LED (white dot) or alert icon flashes repeatedly indicates the purifier has detected a fault or abnormal condition that prevents normal operation. Common reasons include blocked airflow, a saturated or incorrectly fitted filter, or a sensor/power fault. Follow the fixes and checks below to identify and resolve the cause.
- White dot LED or alert icon flashes continuously or in repeated pattern and purifier does not run normally.
- Reduced or no airflow from the outlets even when the unit is powered on.
- Filter replacement indicator lit or the purifier shows reduced cleaning performance.
- Clogged, very dirty, or incorrectly installed filter blocking airflow.
- Air intake or outlet blocked by nearby objects or heavy dust build-up.
- Internal sensor fault or temporary electronics/power glitch.
- Verify filter type and condition: remove filters and check model code. Replace any non-genuine or visibly damaged filter with the correct AEG AX9-series replacement (confirm compatibility with AX91-604).
- Inspect and clean sensors and filter housing: with the unit unplugged, gently vacuum loose dust from the intake vents and filter chamber. Do not use water on electronic parts.
- Check that all filter tabs and seals are seated correctly and that the filter door/latch closes fully; a mis-seated filter can trigger the alert.
- Try a different power outlet and check the power cord for damage. If the unit lost power during operation it may need a restart sequence to clear the alert.
- If you have spare genuine AEG replacement filters, try fitting a known-good new filter to rule out a faulty filter causing sensor errors.
| Filter condition | Remove and inspect. Replace if very dirty or damaged (use AEG-compatible AX9 filters). | If flash stops after replacement — issue resolved. If not, continue checks. |
| Airflow & placement | Ensure 30 cm clearance, remove obstructions, clean vents. | If airflow improves and flash stops — resolved. If not, proceed to sensor and power checks. |
| Power & reset | Unplug 60 seconds, plug into a different known-good outlet, restart. | If flashing stops after reset — watch for recurrence. If it returns, contact support. |
- Replacing filters with non-compatible or incorrect size parts that fit poorly and trigger alerts.
- Assuming the unit is broken without checking for blocked vents or a mis-seated filter.
- Using water or liquids to clean internal sensors or electronics (can cause more faults).
- Do not operate the purifier with the filter removed or with the housing open.
- Do not open sealed electronic modules or attempt complex electrical repairs yourself.
- Always unplug the unit before removing the filter or performing internal cleaning.
- Do not spray water or cleaners into the unit; use a dry cloth or a vacuum on low setting for dust.
If you have followed all steps — cleared and replaced filters, cleaned vents, power-cycled and tested a different outlet — and the white-dot LED or alert icon continues to flash repeatedly, contact AEG support for service. Provide the model (AX91-604), a description of the steps you tried, and the support article URL to speed diagnosis.
- Replace filters on schedule with genuine AEG AX9-compatible parts and follow the unit’s reset procedure after replacement.
- Keep the purifier clear of obstructions and clean intake vents regularly (every 1–3 months depending on environment).
- Use a stable power supply and avoid frequent unplugging while the unit is running.
Can I keep using the purifier if the warning disappears once?
Only if normal operation stays stable. If the same warning comes back, continue troubleshooting or contact support.
Should I replace parts immediately?
Not first. Start with the safe checks and replace parts only when the model-specific guidance supports it.
Answer the questions and jump to the recommended section.
Did Air purifier LED (white dot) or alert icon flashes repeatedly clear after the first checks?