Ventilation to and from the appliance is insufficient, e.g. because it is installed in a small room. The temperature in the room may have risen sharply.
When drying, open the door or window to ensure sufficient ventilation.
--- is shown on the tumble dryer display. The programme has been interrupted.
When drying, open the door or window to ensure sufficient ventilation.
Remove objects that are obstructing the ventilation grille under the door.
Clean the fluff filter in the door and on the door opening.
Clean the heat exchanger.
Spin the laundry in the washing machine at the highest possible speed.