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Zigbee2MQTT MQTT Failed to Connect: Check Broker, Address and Authentication
Zigbee2MQTT stops when its MQTT client cannot reach the broker, so fix the broker layer before touching the Zigbee network. Match the log line to its connection stage, check the address that fits your topology, and keep credentials out of any record you share.
Zigbee2MQTT Onboarding Not Working: Page, Adapter and Validation Checks
A first-run onboarding page that will not load, validate or proceed is usually one of three layers failing. Separate the Home Assistant add-on, Docker and standalone addresses, then check the log, adapter path and type, MQTT reachability and data-directory write permissions before resubmitting the f
Zigbee2MQTT Binding Not Working? Check Support, Groups and Logs
Fix Zigbee2MQTT binding failures by reading the per-cluster bind result: separate a missing table entry from unsupported clusters, sleeping remotes and reporting gaps.
Change a Zigbee2MQTT Channel Without Re-Pairing? Check the Exceptions
A conditional answer for Home Assistant users: what a Zigbee2MQTT channel change keeps, which devices may still need re-pairing, and how to back up, check and roll back safely.
Zigbee2MQTT Devices Not Responding? Isolate the Network Problem
A practical, source-backed order for devices that stop responding while Zigbee2MQTT runs: branch on one device or many, then check availability, the coordinator, MQTT and the mesh before re-pairing.
Migrate from ZHA to Zigbee2MQTT: What to Back Up and Re-Pair
A conservative, version-aware checklist for migrating from ZHA to Zigbee2MQTT: what to back up, what cannot transfer, and how to re-pair devices safely.