Allied Telesis Support Portal

AR220E Self-Test LED

Why does the Self-Test LED stay lit on the AT-AR220E?

This series of hardware diagnostics is called Power-On-Self-Test (POST). While the POST is running, watch the front panel of the Router. The Self-Test LED stays ON during the self-test process. If the POST succeeds without encountering any problems, the Self-Test LED turns OFF. If the Self-Test LED stays on, then the device has failed.
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