You right EC-4 has capability hold back up to 30 days without power but make sure your time is correct, also time of regeneration is set-up for 2 am . System will start preparing Brain Solution 2 Hr. before start backwashing at 12 am.
If you have EC-4 Capacity 50 than CICLE 1 should run for 2 min: 30 sec. This is time when System send water to Brain tank 0,250 mil /min CICLE 2 - 120 min. salt is dissolved CICLE -3 Back wash 5 min computer push water backward to your tank through raiser pipe going down and then is going to CICLE-4 VACUUM this is 40 min of drawing brain solution from yours Brain Tank - 28 PSI for vacuum recommended no less than -15PSI if you have less than you can start have problem have with over flowing or salty water . And then is going to CICLE 5 -2min and 40 sec system push to bottom of tank recharged media.
Also check size of yours Injector and make sure the drain flow for 50 capacities is 1.5 GPM
If you have problem basically RESET computer.