Home Security Systems
Home Security System Repair Questions? Ask a Technician.
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Disconnect the power for a longer interval... try 1 hour or longer... which may be needed in order to rest and reset the systme.
Having the display show nothing indicates a malfunction in the control circuity or CPU of the alarm system. This is serious, and might mean that your alarm system is 'broken'.
(The repair or phone man probably did not 'break' the system, if it was still working when he left and for a while after that. Just by the way.)
How old is the Ademco system in question?
Let me know how it goes, and I will advise you further as appropriate and as needed.