!!
critical Samsung
Error Code Sf3
A system error. The washer has detected an unspecified system fault.
? What Causes This
Internal system malfunction, control board issue, or unknown hardware failure.
✓ How to Fix It
Call customer service for diagnosis and repair.
Source: page 35 of the official manual
From the manual
This error code appears in:
Samsung WF42H5000AW/A2