I'm familiar with intellichem and not intelliph but I thought both work roughly the same as they were both released about the same time and share common parts:
Doesn't the intelliph have its own lcd interface? what does it show/say?
As for interaction between intelliph and intellichlor, isn't that controlled by intellitouch automation? this should be limited to shutting down intellichlor when ph is too high and a few similar things.
Power for both intelliph and intellichlor go to loadcenter right?
Also, as with anything that drops acid, I assume it has a flow sensor and will only work when it measures sufficient gpm? Check your pump speed. (I think it was 30gpm for intellichem if I remember properly).