I just replaced my Autopilot Dig 220 with a new unit. It is running version 4.4 of the software, and controls a one speed pump through an on board pump relay. When the pump turns off, either manually or automatically via the pump program, the display stays on blinking on and off every 8 seconds, and the Check System light also comes on blinking the same. The message in the display says the salt level is too low. When the pump turns on the Check System light goes out and the low salt level message goes away. Running the test pool pilot option, shows there the salt level to be 3600 ppm. The display always blinks at the 8 second interval and never goes to the walking dot screen saver display. This is completely different behavior from my old unit which was 7 years old. Is this normal behavior for the newer units.