When washer turns on there is a horrible buzzing sound, e 20 error message was on before

This is a blocked drain error code (E20) which can be due to a clogged/kinked drain hose, blocked drain filter/coin trap, or a broken drain pump. The link below provides the detailed troubleshooting procedure of this error code. In addition, replace the drain pump after having found no problem with the drain hose, cleaned the filter, and checked the drain pump impeller but the drain pump just hums, buzzes or whirs.

Error Code E20 on Frigidaire Front Load Washing Machines