The 2 most common part(s) or condition(s) which cause the symptom Dishwasher won't dry dishes are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 613049
Some dishwashers have an electrical vent fan motor to help dry the dishes at the end of the cycle. If the dishes are still wet and this model has a vent fan motor, check to see if the motor is functioning. Check it for continuity and spin the fan blade by hand to see if it's worn out. It should turn freely.
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RepairClinic Item # 612929
There is a heating element near the bottom of the dishwasher to dry the dishes. If the dishwasher won't dry the dishes the heating element might have burned out. The heating element can be checked for continuity.