While using the 'Choose Part Number' button to open HydraHEAD Selector and retrieive its description and part number, you get the errors below;

Runtime Error 713, Application-defined or object-defined error

Sprinkler not properly configured.  Please re-select using 'Choose part'

Step 2.3 - After one pass through calculations Miscfunc hangs....

Also possibly "Hydraulic Engine not responding" and a "Runtime Error 62 input past end of file"

Keyboard alias "SAC"

After clicking OK in the AutoCalc Setup window and just before the process begins, you get the following error messages;

Problem updating your Hcad_env.ini file.  /n Will try to rebuild file. /r Pick OK then Restart AutoCALC

Your Hcad_env.ini file is possibly corrupted.  This calc will not continue

Hydratec Security Lock Error

•      Driver Defective. Uninstall, then reinstall the Sentinel Driver. (FF60).
•      No hardware lock. Make sure your hardware lock is firmly attached to a working port. (FF3).
•      If using a Hardware lock: Bad hardware lock found. Unable to read it properly. (RH60) (RSN60)

For example:

After running an Autolist, in HydraLIST and the LINES tab you have a listing tag ID called RM

Step 1a.6 - Hangs at attaching heads

Keyboard alias "BS"

Bayspace preview is not lining up the sprinklers evenly.  Or Bayspace stops working with a "Bad Argument Type 2D/3D point error." message.

Unhandled exception: Input string not in correct format

Revit could not complete the external command... System.ArgumentException