From GridLAB-D Wiki
The check option enables module check routines when GridLAB-D starts. It is managed by the global variable runcheck, which is by default FALSE.
GLM
To enable check mode use the directive
#set runcheck=1
To disable check mode use the directive
#set runcheck=0
Command line
To toggle check mode use the option
host% gridlabd --check
To enable warn mode use the option
host% gridlabd -D runcheck=1
To disable warn mode use the option
host% gridlabd -D runcheck=0