The "Analyse" tool will show you all the problems on entire model at once (or selection) ,including subgroups and subcomponents.
The SOLID groups and components are colored MAGENTA.
The SINGLE edges that are not connected to the faces are colored RED.
The edges of the COPLANAR faces are colored BLUE
The edges that are connected to tree or more faces are colored YELLOW ( INTERNAL faces,additional faces ).
The edges that are connected to only one face are colored GREEN ( open faces ,HOLES ).
The edges of the DISTORTED faces are colored BROWN (not all the vertices are coplanar) .
The edges of the items that are NOT GROUPPED are colored ORANGE.
The edges of the REVERSED faces in Solid groups and components are colored CYAN. (full version only!) NEW!
To fix the problem, you just have to select the tool in the corresponding color.
It is necessary to fix the orange,red,green and yellow problems to make the item Solid (this order is recommended).
There is also a numeric display of the quantity of problems.
To exit from this tool you have to select other tools (like always), for example the "Select" tool.