Zigbee ZHA - all devices offline

Configuration Zigbee
, ,
1

I’m running Home Assistant on a Raspberry Pi4 with Zigbee using a Conbee II (/dev/serial/by-id/usb-dresden_*) and ZHA.
My Zigbee network has been working flawlessly until two days ago. Suddenly all devices became offline. One devices shows up connected after power cycling but can’t be controlled.

I’ve already tried the following without success:

  • full restart of Home Assistant
  • unplugging/reinserting the Conbee II
  • power cycling the Zigbee devices
  • moving the Conbee II to another USB port
  • using a 2 m USB extension cable
  • using a USB docking station
  • updating the Conbee II firmware
  • removing and re-adding ZHA
    Any idea what happened and how to get things working again?
2

I have the same thing, but with PoE/network based SLZB-06M devices.

The SLZB-06M integration shows both devices online, but the “ZHA” integration shows “SLZB-06M failed setup, will retry: Check the logs”.

Couldn’t find anything in the logs related to ZHA.

No idea how to get under the hood to see what’s actually going on.

3

Well…weird. I’ve tried rebooting everything, unplugging, etc…nothing worked.
Then I went to the web interface of the two SLZB-06M devices (one’s a coordinator and the other is a router)…and I switched them from “zigbee” mode to “zigbee plus bluetooth proxy”.

The firmware updated on both of them and when they rebooted ZHA started working again…and as a bonus I have two BT proxies.

Unfortunately I no longer have access to their web interfaces after the firmware swap…but things are working again.

I guess there’s something wrong between the latest HA and the Zigbee firmware on the devices.

4

I upgraded to latest 2025.10 and also (at same time) as is usualo, clicked all the updates (I think) SLZB may have been one of the updates. Like you I have coordinater and Router and am using ZHA. Now HA has discovered a new SLZB and the coordinator has stopped working!! Agghhh!!! No devices online. I dont really want to lose the SLZB interface. Any help, ideas??

5

Update: I tried with another Conbee II and the situation remained the same. In the end, I had to reconfigure the whole Zigbee network :frowning: