You can find the Jandy AquaPure manuals, here
http://www.zodiacpoolsystems.com/pro...pure.aspx#tab6

I'd recommend you walk through the troubleshooting guide the manuals and learn the terms used there.

If you don't solve the problem, call Zodiac customer service at 800-822-7933, and try to get through to their level 2 techs. You're more likely to succeed IF you've gone through them manual, since the level 1 techs will mostly just try to walk you through that over the phone. When they start doing so, you want to be able to say -- using the right terminology -- "Yea, I did that. And, that. That, too, etc."

You probably also want to follow any process for testing the power supply. After 3 years, you may well need a new cell, but you probably want to make sure the the power supply is OK. If it's not, you essentially will need a whole new system, and there are probably better choices than Jandy, for SWCGs.

If you DO purchase a new cell, you will maximize life by buying the largest cell that will work with that power supply. It looks like that might be the PLC1400, which lists for $919.17 in the 2011 Zodiac catalog. Currently, Amazon lists a JANDY PLC1400 Pure Link Replacement Cell Kit 1400 for about $625.