Thanks again, Sean. Here's the latest...
Quote Originally Posted by Poolsean View Post
0 Volts and 0 Amps usually go back to the power module, or as I mentioned, the cell fuse. When you have the power off, and the covers removed, on the top left quadrant of the circuit board, you will see a white, slo blow fuse (20 amp, 250 VAC). You'll need to remove the fuse from the board to check it for continuity. If it's bad, Radio Shack should have this fuse.
The fuse checks out OK.
Quote Originally Posted by Poolsean View Post
You "may" also see this condition if you're very low in salt. If your salt level is ok, then bumping it up to 4000 ppm will squeeze a few months of life more.
The salt level is 3000ppm (checked independently).

This only leaves the power module. How would I check that?

Also, I have to add now that after pulling the cover to check the fuse, I have a new problem. I get a display that says "Purifier Off. Chec" (the display ends and the 2nd line is blank - so I don't know what to check. And, it indicates 0 salt.