kellyann

Hi, I have a nordic hot tub, I emptied before vacation, came home cleaned and filled it up. I have all three of the lights flashing below the temp and the light above temp where the,I think, heat sign flashing. I've put in a new filter, filled it with water in the carteridge area, made sure all the valves are open. I read and reread the instrucition manuel and called the dealer who was no help either. Any suggestions. I emptied and cleaned the tub myself for the last 3 years and this is the first time I've had problems. Kelly