How to Prevent False Alarms
Five causes account for most false alarms. Each has a fix that costs little or nothing — and every one avoided is a dispatch fee you don't pay.
Updated · DCSI, Inc., Lutz FL
False alarms cost more than an awkward phone call. Many Florida jurisdictions charge for repeat false dispatches, every false alarm trains the household to ignore the siren, and a system that keeps going off is a system people stop arming.
The good news is that false alarms are rarely random. Nearly all of them come from the same short list of causes, and the panel's event history usually says which one.
The Five Common Causes — and the Fix for Each
Someone who doesn't know the system
A house guest, a new cleaner, a dog walker, a teenager's friend. User error is the single most common cause of false alarms, and it is almost always a person who was never shown the keypad or given their own code.
Doors and windows that aren't quite closed
Florida humidity swells wooden doors and shifts frames, and a contact that sat a quarter inch from its magnet when installed can drift out of range. A sliding door that bounces back after it's pulled shut does the same.
Pets and motion detectors
A standard motion detector cannot tell a 60-pound dog on the couch from a person. Cats that climb furniture defeat even pet-immune sensors aimed the wrong way.
Things that move on their own
Ceiling fans, curtains over an A/C vent, a helium balloon drifting after a party, and — in Florida especially — insects and spiders crawling across a motion detector's lens.
Weak batteries and aging equipment
Wireless sensors and the panel's standby battery both wear out, and a failing battery can produce erratic signals before it produces a clean low-battery warning. Lightning surges also damage panels and sensors in a way that shows up as intermittent faults.
What Happens Between the Siren and a Dispatch
Florida law builds a safety net into burglary alarms. Before a monitoring center asks law enforcement to respond, it has to try to confirm the alarm with you or someone on your call list — and try a second time if the first attempt fails. Alarms with working video or audio verification are the exception.
That confirmation step only works if the call list is current. A list with a disconnected landline, an ex-spouse, and a neighbor who moved away in 2019 turns a cancellable mistake into a dispatch. Review it once a year, and any time someone in the household changes numbers.
Our monitoring is handled in house from Lutz, so changing your call list or passcode is a phone call to the same people who answer your alarms. More on how that works in how to choose a monitoring company.
False Alarm Questions
What does Florida law require before police are dispatched on a burglar alarm?
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Under section 489.529 of the Florida Statutes, a monitoring company must attempt to confirm a burglary alarm with the owner, an occupant, or an authorized contact — by call, text, or other electronic means — before requesting a law enforcement dispatch, and must make a second attempt if the first fails. Systems with working video or audio verification are an exception. That is why an accurate, current call list matters: it is the list the center works through in those first minutes.
Are there fines for false alarms in Florida?
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Many Florida cities and counties require alarm registration and charge fees for repeat false alarm dispatches, usually after a set number of free ones per year. The rules and amounts vary by jurisdiction, so check with your city or county sheriff's office for where your property is. The cheapest false alarm is the one that is cancelled before dispatch.
What should I do if I set off my alarm by accident?
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Disarm it at the keypad right away — on most systems that sends a cancel signal. Then answer the monitoring center's call, give your passcode, and tell them it was a false alarm. If you miss the call, call the center back. Cancelling quickly is what keeps a mistake from becoming a dispatch.
Why does my alarm go off at the same time every night?
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A repeating time usually points to something mechanical or environmental rather than a person: the A/C cycling on and moving a curtain, a sprinkler hitting a window, a timer-controlled light or fan, or an insect active at that hour near a motion detector. The panel's event history shows which zone triggered, which narrows it down quickly.
Do cameras help reduce false alarm dispatches?
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They can. When monitoring personnel can see or hear the premises, Florida's two-attempt confirmation requirement doesn't apply in the same way, and more importantly the center can tell a real intrusion from a dog on the couch. A center that can tell law enforcement what it is seeing gives them far better information than an unverified alarm signal.
Keep Reading
All guidesBurglar Alarm FAQ — How Alarm Systems Work
What happens when an alarm trips, what monitoring covers, permits, and power-outage behavior.
Is Your Alarm Still on a Landline or 3G? How to Tell
Copper retirement and the 3G shutdown left many panels reporting to no one. How to check yours.
How Many Security Cameras Does a House Need?
Counting cameras by approach rather than by wall, plus PoE vs. Wi-Fi, resolution, and retention.
Alarm Keeps Going Off?
We'll pull the event history, find the zone that's causing it, and fix the cause — not just reset the panel.