1020-****The % milling bur is too long.

% indicates a milling bur stocker number from 1 to 16.

Table 1. Situation/Error Cause
There is a possibility that the position of the milling bur holder is not correct.
Procedure
  1. Check the milling bur.
    Check that the milling bur length is appropriate (40 to 55 mm [1.58 to 2.16 in.]).
  2. Check the position of the milling bur holder.
    Step 3: Setting the Milling Bur