While you wait for answers, we may have found some information which could help you.
How to clean filter on cress T312VW?
Creda Simplicity T620 cw Tumble Dryer wont heat up?
Ignis tumble dryer?
Hotpoint Reversomatic De Luxe 9326 not heating?
How to fix F4 problem on condenser dryer?
White knight B96G8W Condenser drier?