The Bosch dryer E01 error code indicates a heating issue, usually related to a problem with the blocked ducting and restricted airflow. When this error appears, it means that the dryer cannot reach the required temperature for effective drying, which can disrupt cycles and leave clothes damp.

Symptom: The dryer stops operating and buzzes intermittently while in normal operating mode.

Possible causes: 

• A clogged or kinked dryer vent that restricts airflow (vented dryers only).  
• Blocked airways due to a dirty lint filter or heat exchanger.  

Solution: 

• Check and clean the dryer vent and all air paths (vented dryers only). 
• Clean the lint filter. 
• Clean the heat exchanger and the vent grille (Condenser dryer only).

Regular maintenance and checking for blockages or lint buildup can also prevent the recurrence of the E01 error.