Wi-Fi answers
Philips Hue smart bulb (Zigbee) — smart-home gadget keeps going offline
Why does my Philips Hue smart bulb (Zigbee) smart device keeps going offline?
The short answer
One bulb at the end of the garden or in the loft keeps going 'unreachable'. On the WiFiXpert Compatibility Index the Philips Hue smart bulb (Zigbee) scores 90/100, and its weakest check is "Works on a guest network" — which is exactly where this problem comes from. Your phone still has to reach the bridge on the main network to control them.
We publish what breaks with each router and mesh system, and the setting that fixes it.
| Check | Verdict | Points |
|---|---|---|
| Works on 2.4 GHz | Not used | 14/14 |
| Works on 5 GHz | Not used | 14/14 |
| Modern Wi-Fi security | Excellent | 12/12 |
| Happy on mesh Wi-Fi | Excellent | 15/16 |
| Works on a guest network | Poor | 3/8 |
| Survives a plug-in extender | Unaffected | 8/8 |
| Doesn't depend on chatty discovery | Low dependency | 14/16 |
| Easy to fix when it goes wrong | Easy | 10/12 |
The short answer
- One bulb at the end of the garden or in the loft keeps going 'unreachable'.
What our compatibility data shows
- Works on 2.4 GHz: Not used
- Works on 5 GHz: Not used
- Modern Wi-Fi security: Excellent
- Happy on mesh Wi-Fi: Excellent
- Works on a guest network: Poor
- Survives a plug-in extender: Unaffected
- Doesn't depend on chatty discovery: Low dependency
- Easy to fix when it goes wrong: Easy
Free fixes, in order
- Add any mains-powered Hue light between the bridge and the far bulb — each one relays for the next.
- Keep the bridge away from the router itself; the two radios interfere at close range.
- Don't blame your Wi-Fi: the bulbs never use it.
Before you spend anything
- A cheap Hue plug halfway to the far bulb, not new Wi-Fi kit.
People also ask
- Does the Philips Hue smart bulb (Zigbee) work on mesh Wi-Fi?
- Can I put the Philips Hue smart bulb (Zigbee) on a guest network?
- Does the Philips Hue smart bulb (Zigbee) need 2.4 GHz?
- Which router works best with the Philips Hue smart bulb (Zigbee)?
If you do end up spending money
Only after the free fixes. Nobody pays to appear here, and no shop link changes anything we say.
- Router or mesh known to suit this device
- A single wired connection to the device
Where this comes from
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