I did try it, many times, and it didn’t work 
At this point, I would suggest manually installing the zigbee-thermostat driver from the Production Channel. Then download the ST CLI so that you can do driver logging while attempting to pair the device with the hub. You can run the CLI on a Linux/Windows/macOS computer and use the command “smartthings edge:drivers:logcat” to capture what is happening while the pairing is being attempted. Once you invoke the command, you will be prompted for which driver to do the logging.
Should that not yield any output, I would then use the “all drivers” option of the command “smartthings edge:drivers:logcat -a” and attempt the pairing again.
Once you have output from the command, cut and paste here using the Preformatted text option.
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Andreas, two (out of 4) of my convectors are now linked through the pilote you provided. I don’t even know how it happened because they did not show up on the app while it was on pairing mode. Still working on connecting the remaining two (I cross my fingers). Many thanks!!! I’ll keep you posted 
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Hello,
I’m having the exact same problem as you and was wondering if you managed to fix everything. If so, did you just install the driver that Andreas suggested?
I don’t know what to try anymore.
Thank you,
Mike
Hi Mike,
Unfortunately, I have only managed to connect 2 covectors out of the 4 that I have so far. The convectors and/or the Smartthings station could just be crap products.
However, I haven’t had much time in the last few days to do more trials. I have not tried for example what h0ckeysk8er suggests. I expect to do it this week.
But I have low expectations at this point.
I will continue updating this thread with anything new.
Thanks again to all of you who have tried to help me so far!
If you use Android… have you received the latest update for the app?
I have tried what h0ckeysk8er suggested but I get absolutely no output related to the pairing process. The Convector seems to connect automatically to Zigbee channel 14 in a few seconds (which is my Hub channel), but I see nothing in the app and can’t access it at all. The convector “connection icon” stays on like it’s connected, though.
Yeap, but it hasn’t changed anything unfortunately.
Do you have a Smartthings Hub V3? My convector was working flawlessly with my old V2 Hub…
If you get zero output doing driver logging with the “-a” option, then the hub is not communicating with the devices in any way. You should at least see Zigbee messages coming into the hub, even if the hub isn’t able to process them for some reason.
Hello everyone!
I am closing this topic because nothing works.
I still can’t add my 2 other convectors.
In addition, I bought a smart electrical charge controller from Sinopé this week and the same problem occurs.
The device connects to the Smartthings station (the light stops flashing and turns solid blue, which means that the device is connected) but it does not appear on the application (in pairing mode) or on the advanced web page of my.smartthings.
It is listed as compatible by Samsung and Sinopé.
If you are curious, check out the product webpage: Smart electrical load controller 50 A – Zigbee | Sinopé Technologies
So I am done with Smartthings, I will move on to another more reliable gateway.
Many thanks to all for your help.
I appreciated it!
Steve