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Sonoff 4ch pro problem

I installed sonoff 4ch pro to control an irrigation system at home, that works with four 24v AC - solenoid valves. So this way I can set the timer for this system and control it by wifi. I followed the instructions and set it to self locking mode, and at the beginning it was working properly. But the problem is that there is one channel that selfs activate all the time, so I had to disconnect that relay otherwise my garden was flooded!!!! I need the four channels working properly, what can I do to solve this problem??

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On the 4ch pro R3 is no S5 button to clear. How do you reset the rf channel???? My channel 4 is like many on this forum were it just automatically turns on.
I have now discovered that if I press a button when the blue light flashes it turns on or off that Chanel. Still can't reset it or get it on wifi
Same problem here, I have four 4ch pro R2 devices doing the same switching by then selves and they don't have S5 button, it's a major problem to such a wonderful device
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