- Networks
- Smart lighting and home hubs
Light appears offline
WiZ Light appears offline on smart light: server disconnected
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
When a WiZ smart light appears offline in the WiZ V2 or Legacy app, the usual causes are a wall switch turned off out of habit, an automatic firmware update, changed Wi-Fi credentials, or an overloaded access point.
Safety first
Stop and check this first
- Re-doing the pairing procedure to pass new Wi-Fi credentials to your WiZ lights may reset some device settings to default, including WiZclick and fading time.
- Never open a smart bulb, lamp, driver, or power supply (internal work is for a technician only), use a licensed electrician for any wall switch, dimmer, or mains wiring work, and unplug or switch off any device that is abnormally hot, swollen, smoking, or smells of burning.
Safe checks you can perform
- Force close and reopen the WiZ app and wait if the bulb is emitting light
- Verify that the power source and wall switch are turned on
- Power the light off for 5 seconds and turn it back on
- Check Wi-Fi operation, credential changes, and access point device capacity
Leave these tasks to a qualified professional
- Do not attempt this professional task: Restore previous router SSID and password or re-pair the WiZ lights
- Do not attempt this professional task: Relieve Wi-Fi access point overload or contact WiZ support via in-app chat
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Restore previous router SSID and password or re-pair the WiZ lights
What they doConfigure the replacement or updated router with the exact same SSID and password as the previous network so lights reconnect automatically, or re-do the pairing procedure in the WiZ app (noting that re-pairing may reset settings like WiZclick or fading time to default).
They must show youthe WiZ lights back online and responding to commands inside the WiZ app.
In writingwhether the router was set to the previous SSID/password or the lights were re-paired with new credentials.
Relieve Wi-Fi access point overload or contact WiZ support via in-app chat
What they doAudit connected client counts on the Wi-Fi router so the access point capacity (at least 60 devices on most routers) is not exceeded, and if the light still fails to reconnect after all checks, contact WiZ support through the in-app chat function.
They must show youthe router client list within capacity and stable online status for the light in the WiZ app (or the active in-app support chat session).
In writingthe total number of connected Wi-Fi devices checked on the access point and any support chat reference from the WiZ app.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Force close and reopen the WiZ app and wait if the bulb is emitting light
- Who:
- Owner
- How:
- Force close the WiZ app on your phone and reopen it; if the light is physically ON and emitting light, wait a few minutes and check again in case a periodic firmware update is running.
- Result that matters:
- Refreshed online status in the WiZ app after ruling out a display mistake or firmware update.
- If the light returns online after reopening the app or waiting a few minutes:
- the WiZ server connection is restored.
- If the light still shows offline:
- check the power switch and perform a 5-second power cycle.
- Evidence to keep:
- Screenshot of the WiZ app status after force closing and waiting a few minutes.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
Verify that the power source and wall switch are turned on
- Who:
- Owner
- How:
- If no light is being emitted by the bulb, check that the fixture is plugged into a live power source and that its wall switch was not flicked off out of habit.
- Result that matters:
- Confirmation that mains power is reaching the WiZ light socket.
- If the wall switch was turned off:
- flip it back on so the bulb powers up and reconnects.
- If the bulb is powered and emitting light but remains offline:
- proceed to the 5-second power cycle.
- Evidence to keep:
- Photo or note confirming the wall switch is ON and the bulb emits light.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
Power the light off for 5 seconds and turn it back on
- Who:
- Owner
- How:
- If the WiZ light is properly powered and emitting light but still appears offline after a few minutes, turn power off, wait 5 seconds, and turn it back on.
- Result that matters:
- Forced server reconnection triggered by the 5-second power cycle.
- If the light reconnects to the WiZ server and appears online:
- normal app control is restored.
- If the light still fails to reconnect after power cycling:
- inspect Wi-Fi credentials and router device load.
- Evidence to keep:
- App status screen after the 5-second power-off and power-on cycle.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
Check Wi-Fi operation, credential changes, and access point device capacity
- Who:
- Owner
- How:
- Confirm your Wi-Fi network is working, check whether your Wi-Fi SSID or password changed, and verify your router access point has not exceeded its device limit (typically at least 60 connected devices).
- Result that matters:
- Verification of router Wi-Fi credentials and active client capacity.
- If your Wi-Fi password or router changed:
- set the router to the old SSID/password or re-do pairing in the app.
- If Wi-Fi is unchanged but client capacity is exceeded or the bulb stays offline:
- disconnect excess devices or contact in-app support.
- Evidence to keep:
- Router connected-devices count and current Wi-Fi SSID configuration.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center · I changed my router. How do I get my lights back online? - WiZ (Legacy) Help Center
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Networks
- Brand
- WiZ
- Product type
- Smart lighting and home hubs
Known code variants
- La luz aparece desconectada en la app
- Luz WiZ fuera de línea
- My light appears offline in the app
- Offline en app WiZ
- Offline in WiZ app
- WiZ light not online
What it means
The WiZ V2 Help Center article 'My light appears offline in the app. What should I do?' and the WiZ router replacement FAQ explain that a WiZ bulb or lamp shows offline when it loses connection to the WiZ server or when the app displays a cached status mistake. Official causes include a wall switch flicked off out of habit cutting power, a brief disconnection of a few minutes during an automatic firmware update (which happens once every few months), changed Wi-Fi SSID or password credentials, or an overloaded Wi-Fi access point exceeding its device limit (at least 60 devices on most routers). Other models may differ, and this status alone never proves that a part is faulty.
Warnings and stop conditions
- Mediumsource verified
Re-doing the pairing procedure to pass new Wi-Fi credentials to your WiZ lights may reset some device settings to default, including WiZclick and fading time.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center · I changed my router. How do I get my lights back online? - WiZ (Legacy) Help Center
- Mediumsource verified
Never open a smart bulb, lamp, driver, or power supply (internal work is for a technician only), use a licensed electrician for any wall switch, dimmer, or mains wiring work, and unplug or switch off any device that is abnormally hot, swollen, smoking, or smells of burning.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
Symptoms and causes
Probable causes · in order
- Wall switch flicked off out of habit or unpowered lamp socketCommon
If the WiZ light is installed in a socket controlled by a wall switch, someone at home may have switched it off out of habit, removing power completely.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
- Changed Wi-Fi password, SSID, or replaced home routerCommon
When your Wi-Fi credentials or router SSID change, WiZ lights cannot reconnect by themselves until the old SSID/password is restored or pairing is repeated.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center · I changed my router. How do I get my lights back online? - WiZ (Legacy) Help Center
- Automatic firmware update in progress or stale status in the WiZ appPossible
Once every few months, WiZ lights install a firmware update and disconnect from the WiZ server for a few minutes before reconnecting, or the app misdisplays status.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
- Wi-Fi access point overloaded beyond its simultaneous device limitLess common
Most Wi-Fi routers serve at least 60 devices at once; if phones, laptops, tablets, and IoT devices exceed that capacity, devices compete and drop offline.
Evidence: My light appears offline in the app. What should I do? - WiZ V2 Help Center
Virtual technician
Does Light appears offline still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Establecer luces en el modo de emparejamiento - WiZ (Legacy) Centro de ayuda
WiZ Connected · 2026 · official_doc
- 2
Setting lights to pairing mode - WiZ (Legacy) Help Center
WiZ Connected · 2026 · official_doc
- 3
My light appears offline in the app. What should I do? - WiZ V2 Help Center
WiZ Connected · 2026 · official_doc
- 4
Cambié mi enrutador. ¿Cómo vuelvo a poner mis luces en línea? - WiZ (Legacy) Centro de ayuda
WiZ Connected · 2026 · official_doc
- 5
I changed my router. How do I get my lights back online? - WiZ (Legacy) Help Center
WiZ Connected · 2026 · official_doc
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