Hi got one of these ovens again that displays STOP, tried resetting it in the usual way but wont, so suspect pcb needs changing, but is it just the display (part number 481213008762) you change to put it right or is it something else?
I’ve had to replace the button in the past, I know it sounds stupid but did you have selector switched to off before resetting. Got caught out like that myself
If you are sure its not the button, try turning the selector back and forth a few dozen times while spraying in some switch cleaner. It has worked for me a few times