I’ve been experiencing a sudden issue with my Zigbee network that I hope someone here can help me resolve. My Zigbee network has been running smoothly for several months, but last night, all my router devices stopped responding and showed as Offline and edge devices are not updating. I’m receiving error messages like this:
Failed to ping… (Data request failed with error: ‘No network route’ (205))
Here are the details of my setup:
Coordinator: SLZB-06 (Z2M recommended) with PoE, located centrally in the house
Firmware Version: 20230922
Zigbee2MQTT (Z2M) Version: 1.37.0 running on Home Assistant
Mosquitto Broker Version: 6.4.1 in Home Assistant
Number of Devices: Around 60+ devices, with 30-40 being router devices
Channel: Zigbee channel is set to avoid overlapping with WiFi channels (CH 25)
What I’ve Tried So Far:
Rebooted Z2M and the Coordinator: Multiple times, including stopping Z2M, powering off the coordinator for a while, then restarting everything.
Power Cycling Devices: Turned off and on several Zigbee devices, especially router devices.
Checked for Interference: Used a WiFi analyzer to ensure there’s no significant interference from WiFi networks.
Symptoms:
Powered/router devices are showing as ‘Offline’, but neither router nor edge devices are responding/updating.
Receiving “No network route” error for all router devices.
Log:
I am getting the two following warning messages in the Z2M logs:
Most of the warnings are of the first type, with just a few of the latter.
Additional Information:
The network was functioning perfectly until the sudden outage.
No apparent environmental changes that could affect the signal
No updates or restart of HA/Z2M or recent modifications to devices or network
Questions:
Has anyone experienced a similar issue and found a solution?
Are there additional troubleshooting steps I should take?
Any specific logs or diagnostics I should look at to pinpoint the problem?
Any help or guidance would be greatly appreciated! I’m quite puzzled by this sudden breakdown and would love to get my network back up and running without having to re-pair all my devices.
Is this always the case? I do not see how I can improve it though. There are no overlapping Wifi networks with my Zigbee channel and the coordinator should not be affected by any close by interference from other devices.
I’m facing a very similar situation. About 70 devices in total and 20 router devices. After several attempts to restart the whole network I started repairing the router devices and they’re now stable it seems. But 205 error remains for several battery operated devices, will probably also repair them later. Everything started with a power outage as well which (probably) also caused my SSD in the server to become faulty. Luckily I had data backups, but instead of continuing with separate Z2M and HA instances (via Proxmox) I decided to continue with Z2M as HA add-on.
It’s really annoying to no the able to track down what has caused this.
@norsemanGrey have you figured it out? I have the same exact problem. I’ve had it other times too, usually after a power outage. I tried re-pairing router devices as suggested above. In the past this worked, but not this time.
Having the same problem since a week now. Just out of the blue some (not all) devices stopped working. Restart doesn’t resolve the issue. Nothing has changed within the network so i’m in the dark why this is happening
I’m here also. Noticed 1 or 2 devices were a little slow to respond for a few weeks, didn’t think much of it.
Now one I get constant messages of devices been “No route to Host” or “MAC address failure”.
I’ve checked all wifi & zigbee channels, they are spaced apart. Updated and restarted zigbee2mqtt repeatedly, and powered down the coordinator for a period of time. Can’t get anything back up and running, and some are physically very difficult to get to (in roof). 40x devices all useless.
Usually that error is because of interference or poor coverage. You’re telling very little about your zigbee network so very difficult to say for certain. How many of the 40x devices are battery powered?
Same here.
Due to some power outage, the Z2M add-on log gives so many:
failed (Data request failed with error: 'MAC channel access failure' (225)))
and (Data request failed with error: 'No network route' (205)))
The network was perfectly fine before.
In my case, there is an additional weird thing. The battery-operated devices, which are mostly temperature sensors and motion sensors, are online and they actually work.
The connected devices, which are 4 human presence motion sensors and a bunch of dimmer relays are down. The dimmer relays work as they are connected to the wall switches and even I can make them work with the button they have.
If I put them in pairing mode, they are not detected by Z2M. If I remove them completely from Z2M, they will not be paired.
I’ve tried to leave HA off overnight, woke up to the same scenario.
Let’s see if between all of us somebody can gather enough data to know what’s going on!
After fiddling with it all day, and trying several things like:
Moving the coordinator (SLZB06) away from the WiFi router.
Plugging the coordinator into a separate power source.
Powering off all the non-battery Zigbee devices and trying to power them on one by one.
Uninstalling the MQTT broker and installing it again.
and several other things
None of this made any effect whatsoever.
It started working again after several restarts (which I had already tried), and possibly unscrewing the coordinator antenna and screwing it back in. These are the last two things I did before suddenly everything stated working again.
Oddly enough, now the only LED on the coordinator is a soft yellow LED, no blue or green ones on the side. Ethernet lights work normally.
The setup is about 8-9 devices are powered and acting as repeaters, and the rest and battery powered.
As mentioned, the performance degraded over several weeks, then one day all went offline and I couldn’t work out why.
The Eletrco Lama USB was detected and responsive, and some sensors would respond extremely slowly, way way behind normal conditions.
I found the issue;
My beloved other half and CEO of the WAF board had stacked a box near my server. Said box had moved and impacted the ElectroLama USB dongle. It was physically bent at the USB-A end. I attempted to straighten it, and that seems to of fixed it instantly. Literally everything came online near instantly.
It happened again yesterday (month and a half after) and I can confirm that unscrewing and screwing back the antenna is what makes it work (in my case, of course); restarting the SLZB06, MQTT broker, Zigbee2MQTT… does nothing.
