The error codes for Speed Queen front load washing machines may appear as a combination of letters or blinking lights and indicate specific issues. Common error codes include Er, do (door opened during cycle), Er, dL (door unlocked during cycle), Er, dr (drain error), Er, FL (washer hasn't reached fill level after 30 minutes), Er, nF (washer hasn't filled to proper water level), Er, OF (washer has filled to overflow level), Er, PS (trouble sensing water fill level), and Er, dU (door will not unlock).