LAARS Endurance EBP 110 problem

I'm getting hot running water (sinks, showers, etc.) but my in floor heating doesn't work. The pumps for each zone seems to be working... but no hot water gets to the pex pipes in the floors. Any clue as to what might be the problem?

Thanks to anyone who can help.

Here is a link for more info on my boiler system. http://www.csiworldwide.com/Laars/Endurance EBP.htm