It's possible that you have a Solution 16+ keypad - I don't know if (but wouldn't think) they're compatible with the 144. I could be wrong - some places list the CP710 as compatible with the 144 and Solution 6000 panels but can't verify this.
Are the smoke detectors themselves showing an alarm state (normally a red light on the detector itself) or just the panel? From this manual (page 23): you have to manually reset smoke detectors by keying in [MENU]-[3]-[0]-[5], then selecting the area that is in alarm, then [OK]. If the system realarms immediately after the reset, the detectors themselves (or the fire zone circuit) are going into alarm condition (according to the manual, the circuit is closed/shorted).
Could be a weird voltage/current thing with the keypad interfering with the rest of the zone circuits or just incompatible protocols, if the keypad is actually incompatible. If the keypad looks like it's responding though it should be fine - perhaps some devices are drawing too much current for the PSU (especially if the system was powered up with the AC but no battery).
See if you can clear the alarm state and stabilise the system without any active alarms and see how it responds - make sure the battery is in good nick and you have it hooked up.
I believe the 144's closest replacement would be a Solution 6000, but again I'm not sure which accessories are specifically interchangeable between the two.
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