Sorry for the delay in responding, unfortunately this is a hardware failure within the clock\timer module.
Due to the nature of the fault the oven is unlikely to work until the part is replaced, as it thinks its in auto\timer mode.
This is a common fault, the replacement part can be found here for around £50.
If you would like me to recommend an engineer to replace the part please provide your post code.
I appreciate, your comments I will pass this on to customer services who will look at the fee.