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Info on Viper circuit false alarm.

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2 minutes ago, PeterJames said:

That narrows it down a bit use the 24hr tamper wires as the circuit and link out the tamper circuit at the panel. If it stops you either have an intermittent short between tamper and alarm or an intermittent open circuit .

Thank you I understand what you are saying. I'll check it first thing tomorrow.

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16 hours ago, PeterJames said:

There are several things that could be causing your problem as follows:


1. Auxiliary power failing. Loose fuse or poor connection at the panel down powering the vipers will cause the circuit to go open giving the impression that they had activated. This is why its important to know If the pir were to activate along with the vipers when the system is fully set as this would indicate that it is a power problem.


2. The cables to the vipers may have a fault on them, the fact that you have nt had a tamper fault would suggest that the 24hr loop is okay, if you swap the pair both ends and you start to get tamper faults then you know its the cable. Although it could also be an  intermittent short between the tamper and alarm circuit. So if the false alarms continue it still maybe a short between alarm and tamper, To prove this I would remove the wires from the tamper circuit and fit a link, if the fa's stop its a short problem.


3. The panel itself. It could be just the zone or it could be dropping power


4. The vipers. As there is two of them it is very unlikely, but not impossible.


My money is on 1 or 2 the detectors seem to work as they should when tested and the panel operates correctly, but an intermittant fault can be difficult to find  especially without a multimeter. 




Top man Peter James - I started to work through your suggestions and as I did so I also did a visual inspection of the connections in  the control panel. As I touched the zone 7 (false alarming) the yellow cable which is the alarm cable fell out of the connector. I noticed more than 50% of the multi core wire had broken away. I double checked the rest - all were OK. I'm going to soak test over the next few days.

I had only checked the internal battery which was fine.

I appreciate that this may not be the problem but its a good starting point.


I have one more question. Is it possible to programme the FA zone out of the system? Or do I need to disconnect the zone in the CP. I am going away for month of February and If the problem persists I would like to set at least part of the alarm.

I must thank you once again for your time and input on this it is very much appreciated. Whilst I'm happy around handling electronics and looking at the physical side of things, the old brain slows down a bit after time.

Back in the late 60's I worked on fighter aircraft radio systems and their wiring.

Lets hope the problem is fixed.

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If you have the engineer code then yes it's easy to program out the troublesome zone; but unfortunately we can't give out engineer manuals here.

If you struggle to find one elsewhere (you won't) then linking it out with a wire would work.


However, as you say whilst it's highly likely the loose wire was the cause, it's not a definite just yet.


If you can get Engineer access, what would be better would be putting the zone on 'soak' test whilst away.

If it triggers, you won't get an alarm, but it will let you know when you unset. In that way a week or sos holiday

would be an ideal time to soak test.

Edited by datadiffusion

So, I've decided to take my work back underground.... to stop it falling into the wrong hands


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8 hours ago, vykingman said:

I noticed more than 50% of the multi core wire had broken away.


A competent alarm monkey may have found this this by comparing the commissioning readings against whats measured


8 hours ago, vykingman said:

Back in the late 60's I worked on fighter aircraft radio systems and their wiring.


It may be a rumour but ACT Meters claimed they demo'd their "check mate radio meter" to the RAF & used it on an Aircraft which found a number of circuit faults which the RAF tech people assumed was a fault with the check mate but was later confirmed to be an issue with the aircraft


8 hours ago, vykingman said:

I am going away for month of February and If the problem persists I would like to set at least part of the alarm.


Tried post this on an Iphone yesterday but safari/TSI  doesn't work for me ? My Sub called yesterday am after an FA at 05:30, they have fully comp maintenance so the issue was resolved with £28.00+vat of parts fitted by noon & there away in Australia until February

Edited by PeterJames
public swearing

Mr😀 Veritas God

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