I'm sorry, but troubleshooting the interface between an Aquapure and the Aqualink is not something many here have experience with. Have you tried calling Zodiac?

Here's a similar thread, with Zodiac's contact info: http://www.poolforum.com/pf2/showthread.php?14854

And, here are the links to the AquaPure and Aqualink:
http://www.zodiacpoolsystems.com/Pro...uaPure-Ei.aspx
http://www.zodiacpoolsystems.com/Pro...ink-Touch.aspx