I keep getting a flashing 21 and insta-wash light. Start twice clears this but it will come back when you open the door. Can’t get auto-wash or the heavy cycle to start? If I do get aoto-wash it occasionally starts then goes to 21 and insta-wash. Have had to turn off the hose breaker a couple times to clear the 21.
Perform the troubleshooting as described in the Tech Sheet.
Here are the breakdown diagrams and Replacement parts for MAYTAG MDB7601AWB | AppliancePartsPros.com
The Service manual might help as well.
Gene.