AEG AX91-404 error code The Air Purifier Wi-Fi symbol is flashing, cannot connect to the Wi-Fi network

AEG AX91-404 error code The Air Purifier Wi-Fi symbol is flashing, cannot connect to the Wi-Fi network indicates the unit cannot establish or keep a connection to your home Wi‑Fi. It can be caused by network settings, weak signal, temporary router issues, or app/setup errors.

• Wi‑Fi symbol on the purifier blinks continuously or flashes instead of staying solid.
• The purifier does not appear in the AEG app or shows as offline.
• Remote functions (app scheduling, status updates) fail even though the purifier runs locally.

• Temporary router or ISP interruption causing the purifier to lose network access.
• Phone and purifier on different Wi‑Fi networks or different frequency bands (2.4 GHz vs 5 GHz).
• Incorrect Wi‑Fi password entered during setup or a recent change to network credentials.
• Weak Wi‑Fi signal at the purifier's location or network settings blocking new devices (guest network isolation, MAC filtering).

1. 1
   Confirm the purifier's indicator lights or setup state match the manufacturer onboarding instructions before retrying.

   ExpectedYou know the purifier is actually in pairing mode.
2. 2
   Temporarily disable VPN, ad blocking, or network filtering on the phone during onboarding.

   ExpectedThe app can reach the purifier and router without extra filtering.
3. 3
   Check that the router allows new devices on the main network and that guest isolation or MAC filtering is not blocking setup.

   ExpectedThe purifier is allowed to join the home network.
4. 4
   If the app or manual provides a network-reset step for the purifier, run it once and restart onboarding from the beginning.

   ExpectedOld failed pairing state is cleared before the next attempt.

• Trying to connect while the phone is on a different network band (e.g., phone on 5 GHz, purifier requires 2.4 GHz).
• Assuming the household Wi‑Fi password is unchanged—recent password changes must be updated in the app.
• Using a guest network with isolation enabled, which prevents the purifier from communicating with the router or phone.

• Do not open or disassemble the purifier to access electronics — this voids warranty and may be unsafe.
• Do not share sensitive router admin credentials with untrusted parties; only change settings you understand.

• Always switch the purifier off and unplug before moving it to avoid tipping or electrical hazards.
• Only perform non-invasive network and app troubleshooting yourself; for internal repairs, contact AEG or an authorized service partner.

Contact AEG support if: you have followed all troubleshooting steps (router restart, purifier restart, app reinstallation, temporary proximity test, network checks) and the purifier still cannot connect; the purifier fails to obtain an IP address; or you suspect a hardware fault. Have your model (AX91-404), serial number, purchase date, and a description of steps already taken ready when you contact support.

• Keep router firmware and the AEG app up to date to avoid compatibility issues.
• Place the purifier where it receives a reliable Wi‑Fi signal or use a stable home network with reserved IPs for smart devices.
• Avoid frequent Wi‑Fi password changes or ensure you update device credentials promptly after changes.