Biggest Sonoff eWelink Problems and Solutions

Sonoff device are very good at hardware level with poor software / technical support. To enjoy a hassle free user experience, upgrade your Sonoff devices to Sonoff Tasmota opensource firmware and control your device using either Yeti Smart Phone App or Domoticz Local Control Dashboard.


My Sonoff device is paired successfully but remains offline under my eWelink app:

Please check and ensure the key points given below:

  • Your Phone and Sonoff must use same WiFi internet connection during pairing, once paired then you can use any internet connection such as WiFi / Mobile Data Network to control your Sonoff device.
  • If you are using dual-band WiFi (2.4 Ghz / 5Ghz), change the band to 2.4Ghz because Sonoff is a 2.4Ghz device and does not support 5Ghz)
  • Your mobile data must be OFF during pairing the Sonoff.
  • Also turn the “Switch to Mobile Data” option OFF under your Smart Phone WiFi Network Settings.
  • Check if you have applied some network usage restriction such as deny background data usage, under your Smart Phone Network settings.
  • If you are using any VPN services, shut these service OFF prior pairing the Sonoff.
  • Check your router’s firewall to allow the connections.
  • Sonoff devices may not work with WiFi extender, connect directly with your router.
  • In some areas, 4G services are poor and may result in failure to register a device to a user account, Change your network to 3G only for successful registration of Sonoff device with your eWelink account.
  • For more information visit Sonoff Smart Home FAQs or Sonoff Devices Offline Troubleshooting or Device offline.


If you are following all the key points mentioned above, and still facing the issue, Troubleshoot according to the instructions given below;

Ping the Itead Servers for availability, In your Windows PC press;

  • Windows key + R, type ping -t and click OK.
  • Windows key + R, type ping -t and click OK.
  • Windows key + R, type ping -t and click OK.

If you see any Request timed out. error then it means there is some problem with your internet connection. Add the following DNS addresses under DHCP settings of your router (Follow your router’s guide) and ping the above mentioned servers again.


If you can ping the above mentioned servers and there is no Request timed out  error appears, then follow the instructions given below;

  1. Delete the device from your eWelink app.
  2. Turn your cell phone’s airplane mode ON.
  3. Turn your cell phone’s WiFi ON.
  4. Restart your cell phone.
  5. Shutdown your Sonoff device for at least 10-20 seconds (Cut off the power lines).
  6. Turn the Sonoff device ON after 10-20 seconds and press the pairing button for 8 seconds.
  7. Release the pairing button and press it again for 8 seconds.
  8. Now your Sonoff device will go under pairing mode (LED will blink continuously).
  9. Open the eWelink app and press the + button to pair your Sonoff device.
  10. If the firmware of your sonoff device is 1.6.0 or higher then you must select Quick Pairing Mode (TOUCH) icon in adding process.
  11. If the firmware of your sonoff device is lower than 1.6.0 then select Compatible Pairing Mode(AP) in adding process.
  12. Provide the correct WiFi credentials such as SSID & Password.
  13. Wait few seconds and your device will be added to your account.
  14. After successful pairing, Sonoff device may take a minute or half to become online under your Ewelink app.

If you have followed the above instructions carefully and still device is showing offline or continuously being OFFLINE and ONLINE then swap the Line (L) and Neutral (N) wires to Sonoff Line (L) and Neutral (N) terminals (Sometimes user may connect the hot wire to neutral terminals of Sonoff and vice versa).

Pair once again:

In case you are still unfortunate to get your Sonoff online, check your device if it is faulty by adopting the following instructions.

  • Shutdown your Sonoff device for at least 10-20 seconds.
  • Turn the Sonoff device on after 10-20 seconds and press the pairing button for 8 seconds.
  • Release the pairing button and press it again for 8 seconds.
  • Now your Sonoff device will go under pairing mode.
  • Navigate to WiFi settings of your cell phone and search for a new access point starting with ITEAD.
  • Connect to this access point by providing a password “12345678” (without quotes).
  • Once connected, open your mobile phone web browser.
  • if you receive the feedback as shown below, then your device is not faulty and itead ports 443, 8080, 8081might be blocked by your internet service provider.
  "deviceid": "10000xxxxx",
  "apikey": "xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "accept": "post"
  • Contact your internet service provider and ask the operator to parse these domains:,, and

Sonoff is going offline continuously:

After successful pairing of Sonoff Smart Switch with Ewelink app, sonoff goes offline soon after getting online under Ewelink app.

Double check that are you connecting your Sonoff Switch correctly to Power line? Swap the phase and neutral wires (You might be connecting phase and neutral wires incorrectly with Sonoff Switch) and try power up your Sonoff Smart Switch again.


  • Connect Phase wire with Line terminal of Sonoff Switch
  • Connect Neutral wire with Neutral terminal of Sonoff Switch
5 2 votes
Article Rating
Notify of

Newest Most Voted
Inline Feedbacks
View all comments
4 years ago

I’ve bought a Sonoff POW on 22 Nov 2017 on ebay at $9.49. Since then I never attached to power. Yesterday I tried to set it up. On the device PCB, there is a writing: Sonoff POW   Ver 2.0 I used the latest eWeLink Android app (4.0.3 (22 Apr 2020)) to try to connect with, as I’m using it for the other 5 Sonoff RF device I’m using since a while. No success at all. The device hasn’t got quick pairing and compatibility mode. It has only one mode, where the button need to press at least 7 secs, and the… Read more »

1 year ago

Thanks Noi, that works perfect. I tried everything for a week and was just about to re-flash the firmware..

1 year ago

I had the same issue. My SSID (network name) had a space in it and was quite long. I simplified it to one word which fixed the problem immediately. 

Would love your thoughts, please comment.x