My manual states that if the washing & drying light flash together then the machine has an internal leak, and they advise you to call the sevice force centre. see pade 21 of manual.
Mine is flashing the wash selected & drying light. Different from yours and different from the manual.
I suspect that different light combinations indicate to a service engineer different faults.
I'm trying to track down a service manual on the web.
Good lluck with your problem hope this makes you feel less alone.
Dave
January 2005