- Networks
- Smart lighting and home hubs
Device is offline
Tuya Device is offline on smart lamp: lost power or Wi-Fi link
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
When a Tuya Smart or Smart Life lamp shows 'Device is offline' or stops responding to remote control, the cause is usually a switched-off physical wall switch, unstable Wi-Fi, or modified Wi-Fi credentials.
Safety first
Stop and check this first
- Using 'Remove device' at the bottom of the '...' device control menu or resetting the smart light to re-add it erases its existing pairing and saved settings.
- Never open a smart bulb, lamp, hub, or power supply (internal repair is for a technician only), use a licensed electrician for any wall switch, dimmer, or fixed 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
- Confirm the lamp is powered on with its physical switch open and wait 3 minutes in the app
- Test network stability by opening a web page on a phone next to the lamp
- Reboot the Wi-Fi router and wait 3 minutes to observe device status
- Check if the Wi-Fi SSID or password changed before removing and resetting the device
Leave these tasks to a qualified professional
- Do not attempt this professional task: Restore router Internet connectivity or remove and re-add the lamp after Wi-Fi changes
- Do not attempt this professional task: Submit the issue and router model through the in-app '...' > Feedback menu
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 router Internet connectivity or remove and re-add the lamp after Wi-Fi changes
What they doVerify with a phone next to the lamp that the same Wi-Fi network loads web pages after a router reboot and 3-minute wait; if the Wi-Fi SSID or password was modified, open the device control page > '...' button > 'Remove device', reset the lamp, and add it again on 2.4G Wi-Fi.
They must show youa web page loading normally on a phone next to the lamp and the device showing online in the app.
In writingthe side-by-side Wi-Fi web test result, the 3-minute router reboot outcome, and whether the device was removed and re-added.
Submit the issue and router model through the in-app '...' > Feedback menu
What they doIf the home network is in good condition with no credential changes but the lamp remains offline or uncontrollable after 3 minutes, open the device control page, tap the '...' button in the upper right corner, open 'More' > 'Feedback' (or 'Send Feedback'), and submit the issue along with your router model.
They must show youthe completed Feedback submission in the '...' menu containing the router model and issue details.
In writingthe exact router model submitted and the feedback confirmation from the device control page.
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.
Confirm the lamp is powered on with its physical switch open and wait 3 minutes in the app
- Who:
- Owner
- How:
- Make sure the device is connected to power with its physical lamp switch kept on; keep the app open for about 3 minutes and operate the device to see if its online status synchronizes.
- Result that matters:
- Verified continuous power supply and synchronized device status in the app after 3 minutes.
- If the lamp updates its status and responds in the app:
- the physical switch had temporarily desynchronized it.
- If the device stays offline after 3 minutes with power on:
- test Wi-Fi stability right next to the lamp.
- Evidence to keep:
- App device status screen after keeping the app open for 3 minutes with power on.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
Test network stability by opening a web page on a phone next to the lamp
- Who:
- Owner
- How:
- Place a mobile phone or iPad right next to the smart lamp on the exact same Wi-Fi network and try to open a web page in the browser.
- Result that matters:
- Direct check of local Wi-Fi signal stability and external Internet access at the lamp.
- If the web page loads normally next to the lamp:
- check whether Wi-Fi credentials changed or reboot the router.
- If the web page cannot load:
- the Wi-Fi signal is unstable there or the LAN has no Internet connection.
- Evidence to keep:
- Browser page load test on a phone connected to the same Wi-Fi next to the lamp.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
Reboot the Wi-Fi router and wait 3 minutes to observe device status
- Who:
- Owner
- How:
- If the network cannot access the Internet or the device stays offline, reboot your home router and wait 3 minutes while observing the device status in the app.
- Result that matters:
- Restored router Internet connection and cloud link after the 3-minute reboot window.
- If the smart lamp comes back online within 3 minutes:
- the router glitch is resolved.
- If the device remains offline after 3 minutes:
- check for Wi-Fi SSID/password modifications or send feedback in the app.
- Evidence to keep:
- Device status in the app 3 minutes after rebooting the home router.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
Check if the Wi-Fi SSID or password changed before removing and resetting the device
- Who:
- Owner
- How:
- Be aware that clicking 'Remove device' in the top-right '...' menu or resetting the lamp erases its pairing and settings: check whether your home Wi-Fi name or password was modified.
- Result that matters:
- Confirmation of whether the lamp's stored Wi-Fi credentials are outdated.
- If the Wi-Fi name or password was modified:
- tap '...' > 'Remove device', reset the lamp, and add it again.
- If the network is normal and unmodified yet still cannot control the lamp:
- use '...' > 'Feedback' with your router model.
- Evidence to keep:
- Current router SSID check or Feedback form submission showing the router model.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart · FAQ - Tuya Smart
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
- Tuya
- Product type
- Smart lighting and home hubs
Known code variants
- Cómo solucionar el dispositivo fuera de línea
- Device status cannot be synchronized
- El dispositivo está fuera de línea
- La aplicación no puede controlar de forma remota el dispositivo
- The app is not able to control the device remotely
- What if the device is offline
What it means
Tuya's official Help Center guide ('What if the device is offline' and app remote-control/sync troubleshooting) explains that a smart light appears offline or cannot be controlled when it loses power or Internet connectivity. On lights without a smart switch button, turning off the physical wall switch cuts power so the lamp loses connection with the app and behaves like an ordinary bulb (turning on automatically when power reconnects). Other official causes include unstable Wi-Fi at the lamp, a LAN without Internet access, or a modified Wi-Fi SSID or password. Other models may differ, and this status alone never proves a part is faulty.
Warnings and stop conditions
- Mediumsource verified
Using 'Remove device' at the bottom of the '...' device control menu or resetting the smart light to re-add it erases its existing pairing and saved settings.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart · FAQ - Tuya Smart
- Mediumsource verified
Never open a smart bulb, lamp, hub, or power supply (internal repair is for a technician only), use a licensed electrician for any wall switch, dimmer, or fixed mains wiring work, and unplug or switch off any device that is abnormally hot, swollen, smoking, or smells of burning.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
Symptoms and causes
Probable causes · in order
- Physical wall switch turned off or power disconnected from the lampCommon
When a smart lamp controlled by an ordinary physical switch is powered off at the wall, it loses connection with the app and cannot synchronize status.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
- Unstable Wi-Fi signal at the lamp location or LAN without Internet accessCommon
A poor network environment or a router connected on the local LAN without external Internet access prevents remote control and causes offline status.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
- Home Wi-Fi network name (SSID) or password was modifiedPossible
If your home Wi-Fi SSID or password was changed, the device can no longer connect until it is reset and added again in the app.
Evidence: Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
Virtual technician
Does Device is 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
Preguntas frecuentes y solución de problemas de conexión de red - Tuya Smart
Tuya Smart · 2026 · official_doc
- 2
Frequently Asked Question and Network Connection Troubleshooting - Tuya Smart
Tuya Smart · 2026 · official_doc
- 3
Preguntas Más Frecuentes - Tuya Smart
Tuya Smart · 2026 · official_doc
- 4
Tuya Smart · 2026 · official_doc
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