My Miele dryer "Best Friend" T233C had the following problem:
When switching on with the main switch the LED was blinking next to the start button is not as usual, but they remained dark. The LED (anti-crease / End) for the drying stage reached shone constantly. Later, she no longer lit then. The door shut with a loud crash. A blow of the door lock with compressed air brought no improvement.
The new door lock was very easy to install, now works for several months and has saved me an expensive repair by a contractor.