We had a situation where whenever we tried to edge a left lens we would get a 206 error code on our Santinelli 9000 edger (The firstly obtained data in lens shape measurement is abnormal.). What we observed is that when the feeler came down it was missing the lens entirely ie: it was almost as if it could not sense where the lens was. We did an LMU calibration (twice) and were very happy to see that after the calibration the feeler did seem to find and feel the lens. However, the 206 error code was promptly replaced by a 205 error code (Abnormal data for Lens measurement or measured result of the lens). We are unable to progress beyond this point and would welcome any advice.