Help with Zigbee Routing - NWK_NO_ROUTE:205

Configuration Zigbee
1

Hi all,

Very new here, been using Hubitat for a couple of years but have recently started tinkering with HA. I have recently paired a zigbee Centralite Pearl thermostat using a Coordinator about 5 metres away. I also paired a Sonoff plug at about the same distance. After a few hours the thermostat becomes unresponsive with the error in the Subject line; when I look at the zigbee map it does not show offline.

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Can anyone provide some troubleshooting tips? I have seen that if I pop the battery out and back in on the thermostat it will start to react to commands, so I guess it is dropping off the network. Also, this is a 2 wire setup for a gas fireplace, no C wire so running on batteries.

2

You don’t have enough devices to make a viable mesh, most likely. The Home Assistant Cookbook - Index

3

I added a few more devices (including another thermostat device) and my new thermostat (called Temp) is seen on the network:

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But when I try to issue a command the device does not respond:

**2026-01-28 18:16:29.892 DEBUG (MainThread) [zha.zigbee.device] [0x16B5](Zen-01): Device seen - marking the device available and resetting counter**
**2026-01-28 18:16:29.892 DEBUG (MainThread) [zha.zigbee.device] [0x16B5](Zen-01): Update device availability -  device available: True - new availability: True - changed: False**
2026-01-28 18:16:29.892 DEBUG (MainThread) [zha.application.helpers] Device availability checker interval finished
2026-01-28 18:16:30.969 DEBUG (MainThread) [zha.decorators] [<Task pending name='global-updater_GlobalUpdater' coro=<periodic.<locals>.scheduler.<locals>.wrapper() running at /usr/local/lib/python3.13/site-packages/zha/decorators.py:78> cb=[set.remove()]>] executing periodic task [zha.application.helpers::GlobalUpdater.update_listeners]
2026-01-28 18:16:30.969 DEBUG (MainThread) [zha.application.helpers] Global updater interval starting
2026-01-28 18:16:30.969 DEBUG (MainThread) [zha.application.helpers] Global updater interval finished
2026-01-28 18:16:34.881 DEBUG (MainThread) [zigpy.application] Feeding watchdog
2026-01-28 18:16:34.881 DEBUG (MainThread) [zigpy_znp.api] Sending request: SYS.Ping.Req()
2026-01-28 18:16:34.881 DEBUG (MainThread) [serialx.descriptor_transport] Immediately writing b'\xfe\x00!\x01 '
2026-01-28 18:16:34.881 DEBUG (MainThread) [serialx.descriptor_transport] Sent 5 of 5 bytes
2026-01-28 18:16:34.885 DEBUG (MainThread) [serialx.descriptor_transport] Event loop woke up reader
2026-01-28 18:16:34.886 DEBUG (MainThread) [serialx.descriptor_transport] Received b'\xfe\x02a\x01Y\x06='
2026-01-28 18:16:34.886 DEBUG (MainThread) [zigpy_znp.api] Received command: SYS.Ping.Rsp(Capabilities=<MTCapabilities.SYS|AF|ZDO|UTIL|GP|APP_CNF: 1625>)
26**-01-28 18:16:43.930 ERROR (MainThread) [homeassistant.components.websocket_api.http.connection] **[140668896027936] Error during service call to climate.set_temperature: Failed to send request: device did not respond**

Any help on how a device can be seen but not respond?

4

6 devices is a pretty weak mesh… The Home Assistant Cookbook - Index
Check some of the info in that section about zigbee.