Sounds like a problem I'm having with my ClorMatic (somewhere in here says Jandy bought this company and rebadged to Aquapure?). I'm not sure it was the same error code -- I've unplugged the unit because it was making a lot of noise -- but a pool technician told me it was the circuit board.

I'm also interested in what circuit board was replaced, so I can see if I can get a new one without buying a whole new unit. My generator may be beyond warranty period, too.