Hi Alex, when you press the P button does it bleep twice or dead.If it bleeps .look at the latch mechanism in the panel.Is it facing towards you.If not,flick it out with a small straight screwdriver and it will now programme.You may be able to repair the catch in the panel or buy a new panel, about £30. If the P button does nothing,there is a possibility that the panel has locked out.If there is no water in the lower base panel by the motor,you may need a new pcb, about £130.
Try the above, always resend if you need further help.All the best.
Foxy, August 2008