The center of the Air Terminal doesn't align at (0,0,0): align the Air Terminal Center to the Origin Defining Reference Planes could help to solve the problem.

[System] is empty and will be deleted.

Elements are disconnected!

At least one connector on the highlighted element is currently assigned to the [Element Name]. In general items shouldn't be assigned to the Default Systems, but should be assigned as equipments or elements of a non-default system. Click the More Info button below for additional information on System Creation.

Revit found one or more elements with multiple connectors. Select each element and then select the connectors to use for the analytical connection.

Elements need to be disconnected.

You have selected elements that are connected to a parent object in a System. These elements cannot be removed from the System.

Elements need to be disconnected.

Connections already exists for selected element.

The [Tap] must be attached to duct.

The [Tap] must be attached to duct.

The [Tap] must be attached to pipe.

The [Tap] must be attached to pipe.

The selected fitting has invalid connections and must be deleted to continue.

The connector is invalid, the size cannot be determined from the connector.

The load classification parameter cannot be empty. Please select a valid load classification element for the connector parameter and the associated family parameter.

The value for Power Factor must be between 0 and 1.

The element has a connector with a fitting joint gender mismatch

The element has a connector with a fitting joint shape mismatch

The element has a connector with a fitting joint size mismatch

The element has a connector with a fitting joint type mismatch

[Unassigned System Type] on Connector [Index Number].

Cannot add [Element] to System. There is no available connector matching the System Type ([Type Name]) for the System.

Elements in [System Name] are not connected in a single physical network due to one or both of the following:\n- There are disconnects in the system's physical network.\n- Elements in the system are connected to more than one physical network.

The family is connected in a network and can no longer keep the connectivity. Disconnect the family from the network?

The family is connected in a network and can no longer keep the connectivity. Disconnect the family from the network?

No Loss Defined

"K Coefficient from table" is not supported on connector for the element

Connection to a group failed. Modification of elements within a group is not allowed.

Connection to a group failed. Modification of elements within a group is not allowed.

The element has an open connector

The family is connected in a network and can no longer keep the connectivity.

The links between connector [Index] and connector [Index], connector [Index] and connector [Index] are removed.

The link between connector [Index] and connector [Index] is removed.

Shapes do not match. A connection could not be made.

Some elements are not sized because the system calculation is flow only. You may change the system calculation level to size them again.

Some elements are not sized because the system calculation level is none or performance. You may change the system calculation level to size them again.

Sizing failed.

The element has an unconnected circuit on its connector

Device has an unconnected [Type Name] connector (index = [Index Number]).

Revit does not support Undefined connectors. The following have been replaced by the default connector: [Connector Element]