Icepak FAQ: Mismatch between heat flow reporting on objects and dissipations set
Conduction Only problem
When user reported the heat flow on certain objects (walls and blocks with one face set to dissipate in this case) results did not match with the dissipation in the system or the dissipation set for a particular object.
Advised to tune the multi-grid
Set linear solver type to V or W for type and set the termination and resiual reduction criteria to 1e-10
Also ran double precision - this may not be necessary.