Hydratec Inc.

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Revit Based HydraCAD (Ribbon/Toolbar/Location)

Button: Spacing and Layout Function: Insert Sprinklers Error Type: Command Failure for External Command

Description:

Revit could not complete the external command... Family symbol is not valid for this instance


Solutions:

Cause:

Branchline Data's Pipe Type is set to standard, and not a Hydratec pipe type:
Solution:

From that drop down menu, select one of Hydratec's pipe types. In the below example, Hcad3 FP Lines - Threaded was chosen. 
Updated: July 13, 2026, 3:50 a.m. Created: July 13, 2026, 3:48 a.m.