MarkPed

New it is then!!

Bell delay set to zero; Exit time to 10 seconds.

An aged system with eight detectors. Engineer walk-tests fine. But alarm is not tripped by any of the detectors except the three set as exit roots. Really puzzling thing is that if I trip a non-exit detector first (no alarm showing), then an exit detector, the formers number appears on the key pad. Any thoughts on a simple mistake in set up?