hi…generally means loss of communication between the two control boards….ie the digital programe display and the main control module..however be wary here both boards contain EPROM chips and it is usually down to corrupted instructions on either one or both EPROMS..you will require model and serial number of appliance to obtain spares …quite frankly you need an Engineer to identify the fault/s and dependant on the age and condition of the appliance perhaps change it…These appliances were plagued with this type of fault….have a nice day