** ERROR 313240 ** The number of inlets does not match the number of outlets for the Channel (3D).
For accuracy of the solution, the inlet and outlet nodes must be specified on the inlet and outlet face before meshing, so that the mesher can identify the inlet and outlet faces. This error is likely to arise if there are multiple circuits in the model, and an inlet or outlet node has been missed on one of the circuits. This would result in an unequal number of inlets and outlets.
Make sure each circuit has inlet and one outlet node and none have been inadvertently missed.