The pir is a separate circuit. The false alarm happens when it's on part set perimeter only. It's always the same viper zone that shows is activated.

2 hours ago, vykingman said:

I am the system owner.

 

okay,

 

FSL or DP ?

Sorry  - FSL or DP

 it sure what they are

Fully Supervised Loop an end of Line resistor circuit

 

or

 

Double Poled = An alarm loop & a tamper loop

This is a guess  but bare with me. If the viper has wires in both 24hr and alarm terminals would that make it double poled?

infact all terminals have been used.

 

50 minutes ago, vykingman said:

The pir is a separate circuit. The false alarm happens when it's on part set perimeter only. It's always the same viper zone that shows is activated.

So full set no problem?

1 minute ago, al-yeti said:

So full set no problem?

And vipers are not active on full set?

Normally a competent alarm engineer would  measure the circuits,

 

low Ohms between each pair of cables, high Ohms between cables which ain't paired.

 

With the system running on battery power only, measure the voltage at each device to ensure it high enough.

 

Full set the system & check the device operates as intended,

 

If all fine I would swap the circuits with another zone & place the viper circuit on soak test.

 

You can do all this yourself or just find a competent alarm co. to look after your system.....

 

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. 

 

 

 

No-one seems to have asked what panel it is. So I am now

Its a Scantronic 9800 Plus. Mains/battery