Got the Magnum Floor heating working with HA and LocalTuya. I added it without the Cloud API key but directly with the Local Key and Device ID.
Configuration I used
ID: 3
Target Temperature ID: 16
Current Temperature ID : 24
HVAC Mode DP ID : 2
Mode Set: Manual/Auto
HVAC current Action DP ID: 3
Action Set: Heat/Warming
The Climate sensor is available but keeps saying it’s auto… however… I am able to update the temperature settings and when the target temp exceeds the current temp the floor heating will start (checked using the physical interface). I currently cannot see the heating status in the HA. It’s a matter of trial and error when setting up the device. Hope this helps some people here…