What happened?
If a Prusa Printer with a CoreXY detects a crash, it will attempt to find a reference point via a procedure called precise homing. If the right and left sides are not aligned, the precise homing will fail, and this error will be shown.
Error name: Precise Refinement Failed
Error code: #36102 (INDX) #31102 (CORE One) #35102 (CORE One L) #17102 (XL)
How to fix it?
Check the belt tension (Ajustando la tensión de la correa (CORE One L, CORE One) or Ajuste de la tensión de la correa (XL)) and adjust it if needed. Ensure that the printer's right and left sides are perfectly aligned.
If your printer is equipped with the INDX, try redoing the gantry alignment.
After correctly adjusting the belts, the two plastic parts on the sides of the rail should reach the front of the axis together.