Has anyone ever had the Sparx unit not even recognize a grinding wheel being present? It’s like the chip is bad in the ring. Usually, when the unit looks for the ring, the circular red light flashes 5-6 times, then after a few seconds it turns white and displays the remaining life. I have one wheel that doesn’t even make the red light flash, which is what it does when no wheel is present. I’m planning to contact Sparx tomorrow about the problem, but I was hoping someone here had a trick up their sleeve to get the machine to run in this situation. There is no way I’m at the actual end of life with this ring. Thanks.