pjhtech ToolsFor AP Underpowered or Insufficient PoE Output, use a port or injector that supports the AP’s required PoE mode. For PoE Availability Exceeded, free switch power budget or supply a load separately. If uptime does not reset, follow the management-connectivity fix instead of treating the event as a power failure.
Correct the PoE capability or exhausted budget
In Devices → switch → Ports → Port Manager → AP port, check PoE; if disabled, enable the mode supported by that AP and port.
Compare the model-specific Power Method and Max. Power Consumption in Tech Specs with the port’s capability and switch budget. A PoE+ AP on a PoE-only port needs a compatible PoE+ port/injector; a setting cannot upgrade the port.
For exhausted total power, move a load to a separately powered compatible source or provide adequate switch/PSU capacity. Idle draw is not the maximum requirement; do not select passive PoE solely by connector type.
Match the event to the failing layer
Open UniFi Devices → AP and read its Uptime after it reconnects. In System Log, filter to that AP and its supplying switch around the failure time. Compare power warnings, device restart/update events and Ethernet link changes. A scheduled firmware restart also resets uptime; that alone does not establish a PoE fault.
PoE is compatible, but the AP still restarts
Compare a short known-good cable and a compatible port/injector, changing one component at a time. Preserve native/tagged VLAN settings when moving the AP so a power test does not introduce a management-path failure.
If the replacement cable stops the restarts, replace the failed cable/run. If the same AP and cable work on another compatible power source, correct the original source or its budget. If uptime stays continuous, use the management VLAN and inform-target fixes.
Retest at the failing load
Check uptime, link and power status under the workload that triggered the restart. Restore the intended port/VLAN configuration after the test and remove temporary connections. Keep a verified faulty or incompatible power component out of the path.