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Sorry about the delay but I still haven't got my replacement sensors yet. Having ordered 4 (2 replacements and 2 spares) from Maplin last Monday, who appear to be the only source of the type of sensor I require, one was sent to my local store, so they re-ordered another 3, then the order was...

Just to clarify, the 5 normally closed sensors are connected directly to zone 2 terminals. The normally open pressure mat has one wire connected to zone 2 and the other wire connected to the 0v terminal and works fine.

Thanks Joe, a very logical test. Unfortunately this has no effect, i.e. the fault remains with the alarm circuit.

Thanks very much, I take your point. We'll see what the situation is when I have replaced the sensors.

Thanks Alarm for you interest and suggestions. I agree that mains spikes could be a cause and will look into obtaining a filter as you suggest. I can say that the control panel is connected on its own circuit from the fusebox but because this mains supply cable and the zone cables all pass...

Many thanks, oasistechnical for your prompt reply. I take your point about easy fault diagnosis by having one sensor per zone but I have a total of 11 sensors, so I have main entry/exits on zone 1, downstairs on zone 2, upstairs on zone 3 and garage on zone 4, which makes life easy at night...

Thanks, but only a moderator can change this I think??

I have an intruder alarm system with an 8EP 396 Optima G3 compact panel which has been working perfectly for years. Recently I have been getting occasional false alarms, always on zone 2. It appears that these false alarms are triggered by someone switching a light on/off or by the central...