Maytag Dryer Error Code 21

Error code 21 means the control board detected that the dryer did not reach the temperature you selected during the cycle. The heating system, whether electric or gas, failed to produce enough heat. The cause is typically a blown thermal fuse, a burned-out heating element on electric models, failed gas valve coils on gas models, or a clogged exhaust vent restricting airflow.

The dryer is not producing adequate heat, so clothes will not dry properly and cycles will run longer than normal. There is no immediate fire or shock hazard from the code itself, but continued use with a clogged vent, which can cause the code, does pose a fire risk. Diagnose and repair the issue before regular use.

Yes. A blocked exhaust vent restricts airflow through the drum, which prevents heat from building to the selected level and can trigger error code 21. It can also cause the thermal fuse to blow from overheating, which would then keep triggering the code even after the vent is cleared. Always check and clean the vent before replacing parts.

Start by cleaning the lint screen and checking the exhaust duct from the back of the dryer to the exterior vent for blockages. If airflow is clear, use a multimeter to test the thermal fuse for continuity. A blown thermal fuse reads open and must be replaced. On electric models, test the heating element next. On gas models, inspect the igniter and gas valve coils. Replace whichever component tests as failed.

A thermal fuse typically costs $5 to $15 for the part and is a common DIY repair. A heating element runs $20 to $50 for the part. Gas valve coil kits are usually $20 to $40. If you hire a technician, expect $100 to $200 total depending on labor rates and the part needed. Vent cleaning costs nothing if done yourself or $80 to $150 if you hire a service.