i have just had this problem and rang the agent/technichian whose number was on my manual and the solution is
turn off the appliance
completely empty the appliance
leave with doors open for 48 hours
then switch on and keep the doors closed for 8 hours (if appliance beeps press the s button).
after the 8 hours reset the dials to what you usually have them at.
i did this and everything is working as normal - so much better than having to get a new appliance!!! i know this may sound daft but it works. sorry i haven't got the phone number to hand if you need it leave a message and i'll get back to you.
YJC
September 2010