Can anyone help with a bit of fault diagnosis on a viper (x2) circuit

This is an older Scantronic system where I am getting false alarms on a circuit with two vipers - about eight(8) years old.

Strangely neither viper LED flashes after false alarm. When walk tested both vipers flash as they should.

I have checked the internal viper wiring and all good.

Question is this a viper problem or wiring.

Any help would be good - thank you.

Could be many things, so a bit more info is required. If its not wired eol then it may be a cable fault, it may also still be a cable fault if the power is dropping. When was it last serviced? How old is the standby battery?

Many thanks for your prompt reply.

This is has been a fully serviced system since it was fitted. The standby battery was replaced last October on its annual service.

are you the system owner or the alarm eng?

I am the system owner.

The company I was with has been taken over by another. Not happy with new company so have cancelled service contract.

On the walk test do the lights latch on? Do you have a button you have to press to reset them or are they reset when you set the alarm?

Blitz is a good company in Kent if your thinking of changing

On the walk test when the viper is knocked the lights do come on. They are reset when the alarm is reset.

Thanks for the info on Blitz.

okay this narrows it down a little, do you have other powered detection, motion detectors or beams ect?  

The two vipers form part of a perimeter protection for use at night.

the room also has pir detection as backup when house is vacant.

 

So the pir has not been armed so you dont know if it is false activating as well? Or have the vipers activated whilst the property was vacant and the pir was armed