After a tons of browsing and debugging finally I got the real solution to my similar problem with a Saeco Minuto HD8763 coffee machine: the root cause was a bad hall sensor and a weak magnet at the grinder toothwheel (the left magnet whcih was removed from it's original place). The upper one was okay and down under there is the replacement magnet which I made from a piece of HDD neodymium magnet and glued to fix it.
The original hall sensor was marked as "210k 3491" ("HAL506K" based on some other service manuals) and the new one was a cheap non-smd but same size, unipolar "TLE4905" type.
Make the grind coarser by about 3 numbers and try again.
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