What's Happening

The dryer can't reach or maintain the target temperature. For heat pump dryers, this may indicate a refrigerant circuit issue or blocked condenser. For conventional dryers, the heating element may have failed.

How to Fix It

Clean the lint filter and the condenser heat exchanger (behind the lower access panel on heat pump models). If the error persists after cleaning, the heating element or heat pump circuit needs professional service.

Frequently Asked Questions
What does E:64 mean on a Bosch dryer?
E:64 indicates the heating system can't reach the target temperature. On heat pump models, a blocked condenser is the most common cause.
How do I clean the condenser on a Bosch heat pump dryer?
Open the lower access panel, slide out the condenser unit, and rinse it under running water. Let it dry before reinstalling. Clean every 1-2 months.
Is E:64 a fire risk on a Bosch dryer?
No, E:64 means the dryer isn't heating enough, not overheating. It's a performance issue, not a safety hazard.