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I get an error when running network check: the selected component is disconnected

this error may occur at simulation time or when you run the ApacheHVAC network check. If in ApacheHVAC it will give ID of the problematic component and highlight on the canvas

 

Review the information provided to identify and correct the disconnected component or delete it from the network. It may have been something that was missed when moving or deleting a network for instance

Typically this will be a room component which has no ducts and no connection to inlet and outlet, if this is the case then you can use the room/zone without air supply instead which is a special component intended for this purpose