I suspect it’s only been recently that Phonak has determined that they have to electronically match the aids to the charger for the charger to work properly. Prior to this, I’ve had my aids returned for repair for this issue twice, with no improvement. The loaner set I’m using supposedly HAS been matched. With my old aids and charger, several times a week I would insert the aids and have the light blink green, or amber or even sometime red, then they would usually settle in to blinking amber, then blinking green, then solid green…or not! Sometimes they would be solid green…then off! One or both. With the loaner set I’m using, they immediately turn blinking amber, then after a time they are solid green, and they do not change. I really do not know what they do to match the aids to the charger, but it sure seems to work. Now they have the dubious pleasure of matching TWO chargers because I have one for home and one for the motor home. That should prove interesting.