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Intruder Alarm False Alarms: Causes and Fixes
Security, CCTV, access
What to Do If Your Intruder Alarm Gives False Alarms?
DiTi Service engineers · updated 26.09.2026
Short answer
Intruder alarm false alarms are most often caused by pets and insects, draughts and curtains, poorly closed windows, faulty sensors and flat batteries.
Causes: animals and insects in a motion sensor's field, draughts and curtains, windows not fully closed, a faulty sensor, and flat batteries in wireless devices.
The fix: correct sensitivity settings, pet-immune sensors and regular maintenance.
Practical tips
Use pet-immune motion sensors if there are cats or dogs on site.
Make sure radiators and air conditioners are not in a sensor's field of view.
Replace wireless sensor batteries on a schedule, before they run flat.
Frequently asked questions
Why does the alarm go off at night for no reason?
Often because of draughts, insects, temperature changes or flat sensor batteries.
Can I lower the sensitivity myself?
It is better to leave it to a specialist so you don't create blind spots.
