I have about 20 of these devices installed in my house all on the same netowrk. For about a year everything worked well, but recently 8 out of 20 of them are doing the rapid blue flashing and are only accessible when I am on my home network. If I try to access these off this network they show as unavailable.
I also have other Sonoff devices on my network and all of these are working fine. I’ve seen some posts in the past where someone had all of their devices do this, which was an Internet connectivity issue. That is not the issue here. Does anybody know what might be causing this?
If it’s the Sonoff M5 (3-gang), rapid blue flashing usually means the device lost connection to the cloud. But you didn’t mention whether they’re still visible in the app via LAN mode, so it’s hard to say if they’ve lost all connectivity or just cloud access.
To restore full functionality, you’ll most likely need to re-link the affected switches with the app. Also worth checking Wi-Fi signal strength at their location. Poor reception can prevent devices from reconnecting properly after a power outage.
Sorry if I wasn’t clears with this. If you are in lan mode, they still appear as online and you can control them. So what is odd is that identical units with the same firmware on the same network are able to communicate with the cloud but these are not able to and for a year there were not any connectivity issues, so this just started recently.
Possible reasons for the lack of communication with the cloud include issues with the eWeLink server, expired tokens or synchronization errors. If your M5 device stopped communicating with the cloud but still works locally in LAN mode, don’t waste time figuring out what went wrong. The fastest and most reliable solution is a full reset.
Remove the device from the eWeLink app. Go to device settings → tap “Remove Device”.
Reset the device physically Press and hold any button on the device for more than 5 seconds until the LED starts blinking. This activates pairing mode. No need to open or disconnect anything.
Make sure Bluetooth is enabled on your phone. M5 requires Bluetooth during pairing.
Re-add the device In the app: tap “+” → choose “Quick Pairing” → connect to your WiFi and eWeLink account.
After this, the device should reconnect to the cloud and work normally again. Quick, clean, and hassle-free.
No need to open or disconnect anything.