Error - "At least one ZONE needed"

 Product(s):OpenBuildings Energy Simulator
 Version(s):CONNECT Edition
 Area:Part L


When running a PartL calculation you may come across the following error:


This error occurs if a room has been selected on the Select Rooms tab, but then not assigned to a HVAC zone on the HVAC System tab, and also on the Room Data tab.

To do so, please ensure that the room's zone is included as shown below:

 Then, on the Room Data tab please go into each room and specify the HVAC: