We have a 3 year old saltwater pool. In May our IC40 intellichlor went out. Had our pool guy come out to diagnose and told us to buy a new one. Hubby installed it and it's been turning on ok, however, the green cell light has never turned on. The flow and salt levels are green. Is there something we missed when setting it up or did we get a faulty chloinator? It's producing zero chlorine. Thanks in advance.