Last night, went to bed after setting the alrm (downstairs only). After about 10 minutes, it went off. Reset the system and went to bed again, then it went off after about another 10 minutes. So left it unset in order to get some sleep!

Now have to investigate the fault but it's likely to be one of the PIRs. Question is, what causes this sort of 'delayed' fault? Should all PIRs that come under suspicion be replaced as a precaution?

Thanks for any advice.

Hi ,

What was showing on the display when you unset the alarm?.(what make / model of alarm?)

Regards.

I would check that there is nothing in the way of the PIR's and that they are dust and cobweb free, spider and other such things seem to like crawling inside PIR's of course they can cover the sensor enough to make it think there is an intruder..

1st thing i would do is check the alarm log if your alarm panel has one to see what Zone(s) and thus what PIR('s) were going off.

A few questions, is this a panel you've fitted yourself? When did the panel last get serviced & how long ago was the battery replaced..

Maximum recommended time between battery changes in panels is 5 yrs but many do it at 4, 3 if the panel is in a warm environment such as an air cupboard as the battery gets too warm and this reduces the overall life span of the battery.

Sometimes it's the battery needing replaced especially if when you look at the log the zone / pir is "random".

Hope that helps..

Hi ,

What was showing on the display when you unset the alarm?.(what make / model of alarm?)

Regards.

The entry/exit zone was showing.

Veritas 8 control box.

Loose cable in door contact or panel.

Faulty door contact.

Fault on cable.

Door magnet not quite aligning with contact properly??

I would check that there is nothing in the way of the PIR's and that they are dust and cobweb free, spider and other such things seem to like crawling inside PIR's of course they can cover the sensor enough to make it think there is an intruder..

1st thing i would do is check the alarm log if your alarm panel has one to see what Zone(s) and thus what PIR('s) were going off.

A few questions, is this a panel you've fitted yourself? When did the panel last get serviced & how long ago was the battery replaced..

Maximum recommended time between battery changes in panels is 5 yrs but many do it at 4, 3 if the panel is in a warm environment such as an air cupboard as the battery gets too warm and this reduces the overall life span of the battery.

Sometimes it's the battery needing replaced especially if when you look at the log the zone / pir is "random".

Hope that helps..

Yes I fitted the (Veritas 8 ) panel myself, exactly 3 years ago. It replaced an earlier panel so I left the PIRs in place. They were 'A1' from B&Q (now no longer available).

But 6 months ago I added a second PIR to the entry/exit zone, in series with the existing A1 PIR, to give extended coverage. The one added is a Melcom Micro Plus from Maplin with the pulse count set to 1.

The event log reads, from most recent:

entry/exit zone

entry/exit zone

tamper, tamper, tamper, tamper, tamper (max 7 events)

Yes I fitted the (Veritas 8 ) panel myself, exactly 3 years ago. It replaced an earlier panel so I left the PIRs in place. They were 'A1' from B&Q (now no longer available).

But 6 months ago I added a second PIR to the entry/exit zone, in series with the existing A1 PIR, to give extended coverage. The one added is a Melcom Micro Plus from Maplin with the pulse count set to 1.

The event log reads, from most recent:

entry/exit zone

entry/exit zone

tamper, tamper, tamper, tamper, tamper (max 7 events)

Pulse count of 1 probably too sensitive for the quality of detector and environment - tamper faults indicate a wiring fault, possibly when you added it?

I would check that there is nothing in the way of the PIR's and that they are dust and cobweb free, spider and other such things seem to like crawling inside PIR's of course they can cover the sensor enough to make it think there is an intruder..

1st thing i would do is check the alarm log if your alarm panel has one to see what Zone(s) and thus what PIR('s) were going off.

A few questions, is this a panel you've fitted yourself? When did the panel last get serviced & how long ago was the battery replaced..

Maximum recommended time between battery changes in panels is 5 yrs but many do it at 4, 3 if the panel is in a warm environment such as an air cupboard as the battery gets too warm and this reduces the overall life span of the battery.

Sometimes it's the battery needing replaced especially if when you look at the log the zone / pir is "random".

Hope that helps..

I found a very small, live spider very close to each of the PIRs in the entry/exit zone.

may find this is the problem, on a lighter note can you ask it, if ten minutes is it lap time