> 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/installation/config-file/practical_examples/connection_failure_indicator.md).

# Connection failure indicator

The [Status LEDs](/cg1018-relay-box-installation-manual/overview/status-leds.md) indicate whether the unit has Internet connection which is checked by pinging the adress at PING\_URL, and if there is connection to the server. 

The ETH LED is blinking green if the ping is successful and the CON LED is steady green if we have a successful reply from the server.

If you want to get an indication on a relay, when the connection to the server fails, you can do so by using the following options: \
\
and/or \
**TURN\_ON\_CH2\_IF\_CONNECTION\_FAILS=1**

```sh
TURN_ON_CH1_IF_CONNECTION_FAILS=1 
```

**The relay can still be used as normal and be controlled by the server, as the connection fail status is OR’ed together with the status from the server.** 

Using this method, the relay can indicate both sensor alarm and connection fail on the same channel. 

This can be a useful feature as you will get a clear indication in case the CG1018 cannot contact the server. 

You may also invert the channels to setup an additional indication of failures.


---

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