While you wait for answers, we may have found some information which could help you.
Click here for Condenser Dryer DryingBosch excel condenser dryer 6307?
Bosch Classixx not heating even after trying red button reset ?
Bosch exxcel condenser dryer WTL6307GB?
Tumble dryer not drying clothes?
Bosch Excel tumble dryer condensor?
Where can I get a wiring diagram or service manual for Bosch Classixx dryer?