Bosch tritech false alarms

21 May 2007
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United Kingdom
I have a Bosch Tritech PIR (ISC-BDL2-WP12H) in a corridor which keeps false alarming (normally in the dead of night!) and I don't know why.

I have actually replaced the unit with another brand new Bosch unit but it hasn't solved the problem so I guess it's the situation.

The sensor is positioned 2.6m up in the middle of the wall above a door looking down the corridor towards a locked back door (picture enclosed from the perspective of the sensor). Corridor is 8m long x 1.1m wide and has 3 normally closed doors leading to rooms with their own PIR, there are no pets. This is the only sensor out of the 8 we have which false alarms.

Any suggestions?


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If you have changed the detector and are still getting false alarms then they must be a cause.
How often does it false alarm.
I would twist the alarm pair together inside the sensor for a few days,this will prove the cable / control panel.if no false alarms then I would Check room for insects,rodents etc.

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