> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/cg1018-relay-box-installation-manual/overview/status-leds.md).

# Status LEDs

<figure><img src="/files/stYCPLSWrOzvRtcm5S5C" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="86">LED</th><th width="101">Function</th><th>Description</th></tr></thead><tbody><tr><td>D0</td><td>RDY</td><td>Lights red when the unit is powered on and changes to green after internal controller finishes boot which takes about 20s.</td></tr><tr><td>D1</td><td>ETH</td><td>Off during boot. Blinking red when there is no network connection. Blinking green when network connection works correctly.</td></tr><tr><td>D2</td><td>CON</td><td>Off during boot. Red when there is no answer from the server defined in the <a data-mention href="/pages/xnIJ3nLC7gEq22xZOEm4">/pages/xnIJ3nLC7gEq22xZOEm4</a>. Blinks green when server connection is established but there is no Relay Box defined with a matching MAC address. Steady green when there is connection to the server and a Relay Box with a matching MAC address is defined there.</td></tr></tbody></table>


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