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info TP Link
Status (Power) LED not on/off steadily
The extender is in the process of starting up or performing some internal maintenance activity.
? What Causes This
Startup sequence or maintenance routine is running.
ⓘ What This Means
Wait until operations are completed and LED turns stable before using the device normally. If issues persist, refer to support documents.
Source: page 41 of the official manual
From the manual
This error code appears in:
TP Link Re220 Range Extender