Motion Sensor Triggering Falsely
Motion sensors on the alarm or outdoor lights activating when there is no one present.
What Is Causing This?
- 1Sensor sensitivity set too high
- 2Pets, wildlife, or insects triggering the sensor
- 3Heat sources near the sensor causing false readings
How Urgent Is This?
This is a cosmetic issue. It is not causing damage and can be addressed in your own time.
What Needs to Be Done
A security installer will adjust the sensor sensitivity, angle, and coverage area. They may replace it with a pet-immune model or relocate it away from heat sources.
How Much Will It Cost?
National average estimate
Labour: £147 – £400 | Materials: £143 – £633
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Prices are estimates based on typical UK rates. Actual costs depend on the specific issue, accessibility, and your location. All quotes from tradespeople on Tradesfolk are completely free.
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Ask a QuestionHow to Prevent This
Position sensors away from radiators, windows, and vents. Use pet-immune sensors in homes with animals. Clean sensor lenses regularly.
Related Problems
Other Alarm & Security Installer Problems
The burglar alarm sounding for no apparent reason, often at night or when the house is occupied.
Your CCTV system is not saving footage, shows a blank screen, or has stopped sending alerts.
The alarm keypad does not light up, accept codes, or respond to button presses.
The alarm panel or a sensor emitting a persistent beep, usually indicating a fault or low battery.