Zigbee Automations Quit Working - Lost Comm SLZB-06

ARAMP1 · October 12, 2025, 4:18pm

I noticed it sometime after upgrading to the new SLZB-06 V3.0.6 firmware. Unfortunately, it was about 12-16 hours after that that I noticed anything. So, I’m not sure the new firmware did it, but it’s definitely suspect.

I can start and restart Zigbee2MQTT

But, this is what I get when I go to the sidebar addon.

I’ve rolled back to V2.9.8 firmware but no dice. I’ve also rolled back to an earlier version of HA but that didn’t work either.

I’ve double checked Serial Port, Adapter and Baudrate and they are all correct and match in HA and the coordinator UI. I’ve restarted and reloaded the SLZB-06 in the UI and in HA integrations page. It’s running PoE and I’ve even disconnected it and reset it from the switch.

Here’s what the Zigbee2MQTT log is showing.

Here’s the SLZB-06 log. 192.168.70.200 is my home assistant.

Short of resetting the SLZB-06 to factory settings and re-installing, I’m not sure what else to do or check.

fleskefjes · October 12, 2025, 4:29pm

503 Bad gateway means the add-on is not starting. It usually says why in the logs when you try to start it. Try disabling debug logging and see what you get in the logs then.

ARAMP1 · October 12, 2025, 4:35pm

Thanks. Where is the debug logging setting?

fleskefjes · October 12, 2025, 4:47pm

You can find it in zigbee2mqtt/configuration.yaml.

ARAMP1 · October 12, 2025, 4:53pm

Thanks.

Not sure what I’m looking at here…

fleskefjes · October 12, 2025, 5:01pm

ARAMP1 · October 12, 2025, 6:12pm

Yeah, I’ve read through that and couldn’t find anything…

But, decided to use another channel besides 11. Switched to channel 9 and got the error message that it needed to be 11 or greater. Switched to 13 with no joy. Switched back to channel 11 and I now have a connection!!!

All my devices need to be re-added, but at least it’s talking.

I appreciate your help and suggestions.