Hi everyone I have a scantronic 9800 plus and the other day I set alarm to exit house but changed my mind so entered code to disarm alarm that’s when it sort of went wrong and key pad seemed to freeze the keypad seems fine now I have replaced battery, and door contacts ,and did walk test which worked fine but can’t get out of engineers mode when I try to exit 99 it displays C- with a bleep so basically it seems stuck in E mode I did get alarm company out today cost 96.00 for him to say I don’t know much about these old alarms and circuit board in knackered please help thanks glen