I have a Sonoff basic flashed with Tasmota and communicating with OH via mqtt. The switch is used to control a lamp in my living room and has worked flawlessly for the past 8 months.
The issue happened last night when the lamp turned off, no OH rule or other commend, it just turned off. I used Alexa to send a command and was able to turn the light back on but after a few minutes it turned back off. Nothing in the OH log to indicate the lamp being commanded to turn off. I used BasicUI to turn the light back on and after a few minutes, same thing, it turned off. This time I left it off and noticed, after a few minutes, the lamp would do a quick flash like it was trying to turn on. This happened twice before I unplugged the lamp and checked the switch to see if it was maybe overheating. It wasn’t hot and looking at the switch I can see nothing to indicate an issue.
As mentioned above nothing in the logs to indicate it’s an OH issue but thought I would post this to see if others have experienced something similar, and if so what was the solution. I have several spare Sonoff’s but hate to just toss one if there’s a fix.
EDIT: I also check the Sonoff web console for anything suspicious but everything looked normal.
I would open up the web interface to it, and keep an eye on the console. This should tell you what’s occurring internally - whether it’s receiving a command, or it thinks the switch is activated etc.
Yep, toggles via the console but I didn’t try turning it on, and leaving it, to see if it would remain on. After the second flicker I got a bit worried and didn’t want to trip a breaker or burn something up so I unplugged it.
I honestly think its a component issue but thought I would ask before breaking out the meter and soldering iron.
I’d start a MQTT logger to see if something sends commands to the switch. mosquitto_sub or a debug logging in on the mqtt broker if you control it.
Probably someone got access to your broker?
You are probably correct. I had a few sonoff fail. But they always fail safely. Meaning: relay OFF.
In your case I think it’s the capacitor providing the constant voltage to the realy’s coil.
I’ve also had WiFi antenna amplifier failures and relay coil failures.
No swelled caps that I can see but de-soldering and checking is easy enough. This is the first Sonoff failure so taking the time to find the cause should save me a few $ down the road.
Thanks @Muplex the videos were good, got them book marked, but I’m not using the extra GPIO.
I plugged in the Sonoff again to see what would happen and it’s worked without error. For now I’ll monitor and use the suggestions provided above, hopefully I can find the root cause.
During the summer we’ve got a new Home-Cinema system and the place between the wall and the self is narrow, I had power down everything for almost a day (while we installed the new AVR, loudspeakers, etc…). That means there were no OH, no internet, no Wi-Fi connection. During that the Kitchen Lights was on, which is controlled by a Sonoff Basic. There were these flickerings every 10-20 minutes, it turned off and right after on again. For me it was caused by that there were Wi-Fi connection.
The Sonoff 120v cord connection was loose, when trying to secure the wire I found the screw terminal was stripped out. Not sure how I didn’t notice this when first installing. My plan is to replace the terminal, soon as I can find my spares, and put the switch back in service.
This may or may not be the cause but time will tell.
While repairing the questionable Sonoff I used a new one and started having the same issue.
The root cause was a bad plug on the outlet. The other plug seems to works fine and after 5 days without issues (four days on the repaired Sonoff) I’m calling it solved. It’s been years since having an issue with outlets, I guess nothing last forever, time to do some replacing.
For anyone that has similar issues I encourage you to read all the post, several great suggestions, and don’t forget to check the unexpected things like outlets.