Home Security Q&A: False Alarms, Fireworks Night & Fixing Nuisance Activations (East Midlands)

Written by Dan, Managing Director, SYNERGiT GROUP LIMITED Published: Friday 6 November 2026

Welcome to our East Midlands guide to false alarms and nuisance activations. We answer common questions from homeowners in Derby, Nottingham, Leicester and Northampton. Find out what can trigger an alarm, what to do when it sounds and how expert maintenance can help keep your home protected.

1. Why does our intruder alarm go off when nobody has broken in?

Direct answer: False activations usually come from a trigger the system genuinely detected: a pet or insect, a moving curtain, a low battery, a faulty sensor, or user error with codes and entry timers. Identifying the cause is the first step to preventing a repeat.

Elaboration: Alarms respond to movement, opening contacts and signal faults, and everyday events can sometimes imitate an intrusion. A spider crossing a detector, a pet moving upstairs or a door left slightly ajar can all cause an activation. When we investigate, we check the event log first. It shows which detector triggered and when.

2. Do fireworks and Bonfire Night set off burglar alarms?

Direct answer: Fireworks themselves rarely activate a well-fitted alarm. However, heavy vibration or shock can affect poorly mounted contacts or detectors, while bright flashes may affect some outdoor motion sensors. Correct equipment choice and positioning can prevent most fireworks-week activations.

Elaboration: Around 5 November, we may see activations on external detectors or outbuilding door contacts. Vibration-resistant contacts, suitable pet-immune or dual-technology detectors, and sensible positioning can help. If your alarm has activated during fireworks displays before, we can review its event log and check the affected devices ahead of next year.

3. Can our pets set the alarm off while we are out?

Direct answer: Yes, if detectors were not specified for pets. Pet-immune motion detectors are designed to ignore animals up to a set weight. Matching the detector type and layout to the animals in your home can reduce pet-related activations.

Elaboration: Pet-immune detectors use lens designs and signal analysis to distinguish an animal from a person. They have limits: cats that climb high, several animals together or a very large dog may still trigger detection. We ask about every household pet at survey stage, then recommend and position detectors to suit the home and its occupants.

4. What should we do when the alarm sounds and we don't know why?

Direct answer: Stay calm and check for signs of a genuine break-in from a safe position. If nothing is visible, silence the alarm and check the event log or app. Do not search the property alone in the dark. If you believe a crime is in progress, call 999; otherwise, call 101 if you need to report a concern.

Elaboration: Most activations are false, but we should never assume that one is. Look through a window or use a camera before approaching the property. If your system is monitored, answer the monitoring centre’s call and follow its procedure. Once everyone is safe, note the zone that triggered. Police.uk advice also advises against putting yourself in danger to check a property.

5. How do we reset the alarm after a false activation?

Direct answer: Once you are satisfied it is safe, enter your code to silence and reset the alarm. Then check the control panel or app for the trigger event. Most systems show which zone or detector activated, helping you identify a sensor issue, contact fault or user error.

Elaboration: If the same detector keeps appearing in the event log, there may be an underlying cause, such as its position, a failing battery or a device nearing the end of its life. Repeated activations on one zone are worth investigating. We can check the system and recommend a suitable repair or replacement.

6. Why do spiders cause so many false alarms?

Direct answer: Spiders and small insects can cross a motion sensor’s detection path, particularly in colder months when they move indoors. Regular servicing, clean detector lenses and sensible sensor placement can help keep insect-related activations to a minimum.

Elaboration: A spider moving directly in front of a passive infrared detector can register as a heat source. We often see insects or cobwebs noted around sensors during checks. Keeping detectors away from corners where spiders gather, gently cleaning covers during monthly checks and choosing suitable insect-resistant housings can reduce the risk of nuisance activations.

7. What happens with false alarms on a monitored system?

Direct answer: Monitoring centres follow a response procedure to check activations, often by calling you or your keyholders before taking further steps. Repeated false alarms can lead to unnecessary callouts and a review of the system, so it is important to investigate persistent causes rather than tolerate them.

Elaboration: Keep your contact details and keyholder information up to date so the monitoring centre can reach the right people. If a fault causes repeated activations, the centre may ask for it to be repaired. We recommend finding the cause early: a service visit can help prevent further disruption. Police attendance is not guaranteed and depends on the system and circumstances.

8. What maintenance prevents false alarms?

Direct answer: Arrange an annual professional service and carry out simple monthly checks. Test the system, act on low-battery warnings, keep detector lenses clean and check that doors and windows with contacts close fully. Worn contacts and fading batteries are common causes of activations.

Elaboration: Batteries weaken over time, and many systems provide a warning before they fail. We recommend acting on those alerts rather than simply clearing them. Frequently used door contacts can also wear and signal intermittently. During a service, we test detectors, inspect contacts, check signalling and review the event log for patterns.

9. Are wireless alarms more prone to false alarms than wired ones?

Direct answer: A well-specified wireless alarm is no more prone to false activations than a wired system. Modern encrypted sensors report battery and signal health, and most wireless false alarms relate to batteries or positioning rather than the technology itself.

Elaboration: Current two-way wireless sensors can alert the control panel when a device needs attention. Wired systems do not rely on device batteries, but they depend on sound cabling. The right option depends on your property and priorities. In some East Midlands homes, a hybrid system with wired core devices and wireless extensions may be suitable.

10. What does a false-alarm-proof upgrade typically cost?

Direct answer: As a guide, a new intruder alarm starts from £650 and a CCTV system starts from £750. Upgrades to existing equipment, such as pet-immune detectors or vibration-resistant contacts, are priced after a survey. We do not charge for the survey itself.

Elaboration: These are starting prices, not fixed quotes. The final cost depends on your property layout, detector numbers, cabling, signalling and whether monitoring is included. We explain the options before work begins, so you know what is included and can choose a specification that suits your priorities.

Item	Guide price
Intruder alarm system	From £650
CCTV system	From £750
Pet-immune detector upgrade	Priced after survey
Vibration-resistant contact upgrade	Priced after survey
Monitoring	Monthly agreement, price confirmed for the system
Home security survey	£0

11. How do we stop CCTV recording every passing car or fox?

Direct answer: Set motion-detection zones so cameras ignore roads, pavements and boundary movement. Adjust sensitivity rather than disabling alerts, and use person or animal detection where the system supports it. Correct camera positioning can make a significant difference.

Elaboration: Cameras facing roads may flag headlights, while trees can generate alerts when they move in the wind. We can set zones to exclude roads and public footpaths and configure person or animal detection where available. If alerts still overwhelm you, we can retune the settings instead of leaving notifications switched off.

12. Can our alarm or CCTV cause problems with the neighbours?

Direct answer: An alarm that repeatedly sounds overnight can cause friction with neighbours. CCTV that films beyond your boundary may raise privacy concerns. Fixing repeat activations promptly and keeping cameras focused on your property helps you remain considerate and comply with relevant guidance.

Elaboration: Neighbours may be unable to silence an alarm that keeps activating while you are away, and persistent noise can lead to complaints. For CCTV, aim cameras at your own drives, gardens and entrances rather than a neighbour’s windows. If your system captures areas beyond your property, read GOV.UK’s domestic CCTV guidance.

13. What did we do for a detached home in Hinckley, Leicestershire?

Direct answer: At a detached home in Hinckley, where the alarm had activated twice during fireworks week, we reviewed the event log, replaced a worn door contact, fitted a dual-technology pet-immune rear motion detector and added a camera covering the garden. The activations have not recurred.

Elaboration: The owners had been close to switching off their alarm at night, which would have removed that layer of protection. Instead, two targeted changes addressed the identified issues in one visit. We retested the system with them before leaving. Every property is different, so our home security survey helps us understand your priorities before we recommend a solution. To arrange one, contact our team.

Free survey	What to expect
Cost	£0
Focus	Your home's security and fire detection requirements
Next step	A recommended solution based on the property and your priorities

False alarms are frustrating, but they are often fixable once the cause is found. Contact SYNERGiT to arrange your free survey. We will give you a clear, expert recommendation for intruder alarms, CCTV and fire detection that helps keep your home protected and your routines simple.