Last time I checked, Bill Carlin, the designer of the Phoenix engineering gear, is still available by email, and he is very responsive to owners problems. He helped me out with an issue I had with my gear that was entirely of my own doing. However, in your case, the first thing I would do is check that the Hall sensor and the little magnet that has to activate it are in proper orientation. Also, clean the sensor with a soft brush. If those strategies don’t help, you may need a new Hall sensor, which bill Carlin is able to provide.