I had the exact same problem for trying to add a new zrc-90 from robbshop. But I found a fix:
- Homey APP → Settings → Z-wave → Delete a Z-wave device. Press button “L” on zrc-90 to complete.
- Reset the zrc-90 to factory defaults: Press and keep holding “R” button not less than 10 seconds. Followed by Release “R” button then triple click on “R” button within 2 seconds.
- Now add the zrc-90 as you normally would! Add APP → Remotec Technologies → Remotec Scene Master → Install → Press “L” once → Press “L” once. Done.
This time it will not give you the “Unknown error occured”. And you can use the device in your flows.
Hope this may help someone else.
