Standard method to reset to full factory set conditions for ADE panels is: Power down the panel, remove any connections in "Set Output" terminal and PA Imnput terminal fit a shorting link between these terminals power up, wait for alarm to start, power down remove shorting link and refirt original wiring, power back up code will now 1234.
Having said that this alarm is probably that old it is getting beyond its economic life, consider changing to the accenta the main box printed circuit should be interchangable with the concept one and fit the Accenta keypad in place of the Concept one
davec
August 2009