Bosch WTE84104GB/17 dryer, 3 flashing lights

My Bosch dryer model WTE84104GB/17 won’t start and has 3 lights flashing. The Drying, Iron Dry and Anti Crease/End lights flash and it makes 12 beeps (3 groups of four) when I press start.

If anyone can tell me the meaning of the 3 lights I’d be very grateful cuz I can’t afford to call out a repair guy at the moment and would rather repair it myself if I knew what part was causing the problem.

Thanks
Barry