Three levels, mildest first: restart the hub, reset its Wi-Fi to move it to a new network, or factory reset to wipe it back to a sealed-box state. All three are done from the app — there's no reset button to fish for on the unit.
Restart
The first thing to try for almost anything. A restart reboots the hub without touching any of your configuration — rooms, scenes, paired bulbs, and Wi-Fi all survive. On the hardware LightHub this reboots the device; on a desktop install the service stops and is relaunched automatically.
Reset Wi-Fi only
Moving the hub to a different network, or mistyped the password? Clearing just the Wi-Fi credentials drops the current network and puts the hub back into setup mode, advertising over Bluetooth so the app can hand it new credentials. Nothing else is lost.
Factory reset
The full wipe. A factory reset clears the hub's stored state, wipes its Wi-Fi, resets it to the shipped configuration, and reboots straight back into Bluetooth setup mode — exactly like first power-on.
Resetting a bulb
A bulb that won't pair has usually got a leftover binding to a previous hub or app. The reset is bulb-specific:
- Hue bulbs — reset from the Hue app, or with a Hue dimmer's reset sequence; they then re-appear on the bridge.
- Matter bulbs — most reset with a power-cycle sequence (off/on a set number of times); check the bulb's card for the exact count.
- Anything via Home Assistant — reset the device in HA's own integration; Rhythm picks the change up on the next sync.
Power-cycling — off, five seconds, on — clears a lot of transient pairing failures before you resort to a full bulb reset.