I am now trying to tweak the widget. I can see the vane icon but I noticed one potential problem with my vane item. As I am using Procon A1M Modbus interface I have to send e.g. the vane position as a number to the Modbus interface but your widget assumes that the vane item is a string. Now I am wondering whether I would need to create a second vane item which is a string, i.e. convert the first vane item to a string. I have same potential issue with fan and mode items. I’m not seeing the popup windows either even though I have defined the arrays. I am also wondering what is the Heating Power Item, is this the switch to switch on/off the heat pump. Your widget is really cool so it would be nice to get it working.
I am having strange problems with this widget. At first I setup all the parameters but I noticed that when clicking any of the buttons (except the temperature decrease/increase) the widget quitted and OH resumed the previous page. Then I tried to remove all the buttons except the PowerItem. I copied the code from above and pasted it as a new widget. Still the widget crashed. I then made a new page, added this new widget and setup only the PowerItem. The widget crashed again. Any ideas?
Yeah, just remembered the space issue, i stumbled upon that too - and others also - Heating widget - #41 by RowanS 
EDIT - just seen I actually posted about this, totally forgot about it - Heating widget - #86 by crnjan
Glad you got it working!