Burglar Alarm Going Off Randomly
The burglar alarm sounding for no apparent reason, often at night or when the house is occupied.
What Is Causing This?
- 1Faulty PIR sensor detecting pets, insects, or draughts
- 2Low battery in a wireless sensor
- 3Loose wiring or corroded connections in the system
How Urgent Is This?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
What Needs to Be Done
A security installer will test each zone, identify the faulty sensor or connection, and replace or adjust the component. They will test the full system before leaving.
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
Have the alarm system serviced annually. Replace sensor batteries on the manufacturer's schedule. Use pet-immune sensors if you have animals.
Related Problems
Motion sensors on the alarm or outdoor lights activating when there is no one present.
The alarm panel or a sensor emitting a persistent beep, usually indicating a fault or low battery.
The alarm keypad does not light up, accept codes, or respond to button presses.
Other Alarm & Security Installer Problems
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.
Motion sensors on the alarm or outdoor lights activating when there is no one present.
The alarm panel or a sensor emitting a persistent beep, usually indicating a fault or low battery.