Ubiquiti UniFi Error Code AP-Disconnected: How to Fix It

Q: Why does my UniFi access point keep disconnecting?

Common causes include faulty PoE injectors, damaged Ethernet cables, insufficient power delivery, network switch issues, or firmware conflicts. The AP-Disconnected error specifically points to power delivery problems.

Q: Can I use any PoE injector with UniFi access points?

While most 802.3af/at PoE injectors work, Ubiquiti recommends using their PoE injectors for optimal compatibility. Ensure the injector provides adequate wattage - typically 15.4W for standard APs and up to 30W for higher-powered models.

Q: How do I know if my PoE injector has failed?

Signs include no power LED on the injector, no voltage output when measured with a multimeter, or the access point not powering on. A working PoE injector should output approximately 48V DC.

Q: Will resetting my UniFi AP delete my network settings?

Yes, a factory reset removes all configuration from the access point, but your network settings remain in the UniFi controller. You'll need to re-adopt the AP, and it will download the configuration from the controller.

Q: Can weather affect UniFi access point connectivity?

Yes, outdoor installations can be affected by moisture, extreme temperatures, or electrical storms. Ensure proper weatherproofing and check for water ingress in outdoor enclosures if disconnections occur during weather events.

Abstract

The UniFi AP-Disconnected error occurs when your Ubiquiti access point loses connection to the UniFi controller, typically due to power delivery issues from a failed PoE injector or disabled switch port. This error prevents wireless devices from connecting and can disrupt your entire network coverage.