Just Add Power devices have 2 green lights on the front of the device that are diagnostically relevant: a Power Light and a Data Light. On a rackmount unit, the lights on the port-side are diagnostically relevant.
Healthy Behavior:
The Power Light goes solid and the Data Light stays off for 5-10 seconds after the boot procedure - Power Light Heartbeat Blink - has finished. During this time, network services are being initialized. After network services are loaded, the Power Light will remain solid and the Data Light will show activity.
Unhealthy Behavior:
- The Power Light goes solid immediately upon being powered on and the Data Light never goes on.
- The Power Light goes solid after the Heartbeat Blink, but the Data Light never shows activity.
Cause:
A device with a solid Power Light and no Data Light immediately upon being powered on:
- has had firmware loaded incorrectly (common)
- or has had a power supply with incorrect voltage applied (uncommon)
- or has had the boot memory erased (rare)
A device with a solid Power Light after the Heartbeat Blink and no activity on the Data Light:
- does not have an active network connection between itself and the connected network device
Resolution:
For a device with a solid Power Light and no Data Light immediately upon being powered on:
- can be recovered with Debrick. Instructions for making a Debug cable are included with Debrick, or contact Support and request a pair of Debug cables to be shipped to you. Debrick and instructions can be downloaded in the Knowledge Base at https://support.justaddpower.com/kb/article/163-debrick-recover-a-just-add-power-device
- For devices that cannot be recovered with Debrick, contact Support for additional recovery options.
For a device with a solid Power Light after the Heartbeat Blink and no activity on the Data Light, perform these troubleshooting steps:
- Swap the J+P device with another known-working J+P device. If the problem follows the defective J+P device, then the network port on the J+P device may be bad. If the problem stays at the defective location, then a network piece around the J+P device is bad.
- Replace the network cable between the J+P device and the connected network device, as it may be bad. If the J+P device is PoE-powered, the PoE pins on the cable may be working but the data pins are not.
- Connect the J+P devices to a different network device. The network port on the network device may be bad.
Please contact Support for additional troubleshooting assistance.
