Indesit IWDE12 not drying/lights flashing?

I have an Indesit IWDE12 washer/dryer that has recently starting playing up. When you select a drying programme it starts of normally but after a while it stops drying. The clothes inside are hot and wet, so the heating element is working and i have checked the fan is working ok. When it stops working the following lights on the front start flashing. delay start, iron dry and spin speed all flash at the same rate. the door lock light flashes twice as fast as the others. I have checked the drain pipe which is clear, i have removed the pump and checked that it is clear and i have checked the pipe from the drum to the pump which is clear. I think the flashing lights are a fault code but i can't find any details of these anywhere.
Any help would be greatly appreciated.