I noticed this morning that my IC40 had no lights on the panel. I checked the fuse on my Intellichlor Power Center (I have the separate transformer) and it was blown. After replacing the fuse, I powered the system up and the IC40 began to do its self-test (red/green lights cycling). After the self-test appeared to be complete the IC-40 went blank (no lights on) again. I checked the fuse again and the power output of the transformer and all were good. I also have an IntellipH system which is tied to the IC40 (through the transformer) and it gives me a red light (which apparently means the SWG is off or not connected). Should I try to replace the flow switch before buying a new IC40? BTW, this IC40 is 5 years old and the plates look very good (no build-up, etc.) Thanks for your help!