I would check that tamper spring clicks when the cover is fitted and that the cover is seated correctly, then wait a couple of minutes then trigger the detector (so it sends a new signal to the panel) then type your code in.
Is it possible that the system has been set up for engineer reset on tamper.
If the above fails then you will have to make a call to the installing company / current maintainer
I would measure for induced AC, also measure the incoming mains
I have fitted ACT DC stabilisers when I've had ever had a problematic site that had false alarmed for no apparent reason. (obviously after testing the detector)
Do you route your alarm cables away from mains cabling? (this can cause spikes, especially from circuits that control motors or fluorescent lighting)
You need to connect the 0V from the GJD controller to the relay (C - or Common) and from the (NO - Normally Open) via a diode to the relevant zone you want the GJD lighting controller to trigger.
When the bell triggers it will energise the relay & trigger the relevant GJD lighting zone activating the lighting.
See picture below
I agree, so many people say security is high priority on their list but then scrimp when it comes to protecting their home & valuables... It makes no sense, upgrade for peace of mind
As per PeterCTS's comment, I suspect the company will have engineer reset on the tamper.
Have you checked the battery has not come lose?
If you tap on the casing does the LED light?
Only Just seen this,
Are you part setting the system? If so you have a part set response on the programming menu (it can either be full alarm or internal sounder only)
Best thing is to look on the NSI website and pick a local company from there... These companies have all been vetted
Depending on what issues they find will govern the overall price, but im sure they will give you a standard service cost if you ask...
I concur with SWB, the optex units (dependant on choice) usually fire out dual IR beams, both of the IR beams are centimetres apart and have to be simultaneously tripped to cause a trigger event..
They come as a pair, One of units is the transmitter & the other a receiver,
I certainly would look at installing to an alarm panel as a minimum
The system has probably locked out with the PA button being still activated, also appears like the back up battery is well past its best and needs replacing...
I would strongly consider either a system upgrade (as the panel is very old) or a service by a professional
Just reading this post & I agree that beams installed internally would be the way forward, I have always used OPTEX and found them very reliable.
Have you had any thoughts on what the alarm will trigger? Siren / GSM dialler etc, if there is expensive kit in there as you say then it may attract professional thieves
I have an IPC tester that I bought from videcon a couple of years ago
it does analogue & iP and looks exactly the same as this...
Does anyone know if the firmware can be upgraded so it will do TVI / CVI?