I’d start by checking the wiring to make sure the units are connected correctly. Make sure that you are not shorting anything.
These are very high quality relays, I don’t think you can burn them easily:
If the PSU looks operational, it is most probably something in the relays or the relay driver. If you can post close up pictures of the board, that may provide visual clues
Can you detach the board from 230V completely and power it with 5V from the FTDI header? Check if relays behave as expected. That will eliminate PSU issues. If all works fine when powered from 5V then the PSU is damaged and not providing stable 5V. Do you have multimeter or better off oscilloscope?
again: mind and respect 230V AC
Now they works fine again, but I have invest all the evening in that and I still without any information about why they doesn’t works with a 250V line. I have some options:
1- HTTP control doesn’t connect properly, even with the proper line
2- Capacitor problems. Sometimes the relay tries to move, but the income voltage is low (LED bright very much)
3- Onboard power supply problems with 250V
4- A weird automatic cnfiguration or something I don’t know yet of the menu or settings.
Relays are perfect and board in general doesn’t have any problem.
I will learn how to work with MQTT and learn how to set wifi menu in all the settings.
When I feed them through 5V external supply everyone works perfect but one reboot wifi connection when I switch OFF the relay. The blue led freeze for a second and I can’t switch on for 2-3 seconds.
It only one of them, the other 2 work fine, Any advice?