Are you trying to get the sensor to show or are yih trying to import old data.
If it’s just getting a ZWave sensor to show I’d change this to not be WTH (it’s really for feature requests) move the category and help us with what your sensor is what you have already setup to try t on do it.
You can check the zwave-js driver database for supported Z-Wave devices, and looks like the MH9-CO2 is listed, so at least it thinks it’s supported, so you may be having other issues. Recommend asking for assistance over in the Z-Wave category before assuming lack of support.
Exactly where I was going. This is a problem with your specific device. For the record HA ZWave is certification compliant. That means even if it doesn’t understand the sensor it should pull in the ZWave basic entity at a MINIMUM so if it’s not something else is broken.
Please also update the title to something like assistance with xyz and move it to the ZWave category.
ehhh I wrote; “dont think i found that in the manual” - so i do have the manual, I did read it, but did not find the factory reset. So I gave it that effort.
“just inclusion mode” does not seem to work, I wrote that too.
press k2 long (3 s) and then once short did not reset the node number - contrary to what the manual sais.
exclusion with HA did not work either.
luckily - my homey zwave still works. i tried adding it there and homey then starts with exclusion (I got the three — in the display ) and I aborted the procedure on Homey there.
Then back to home assistant for inclusion and yay - 3rd attempt it worked. pfffff.