Working out what is actually wrong with your alarm
The order engineers use, so you stop guessing and start narrowing it down
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Fault and fix guide
Answer first: diagnose an alarm from the panel outwards, never from the symptom inwards. Read exactly what the keypad says, note when it started, work out whether the condition is live or logged, then narrow it to a single zone or to the system itself. Almost every wasted hour we see comes from somebody starting at the detector and working backwards.
This is the general purpose guide, useful when you have a fault that does not match one specific symptom, or several odd things happening at once. It does not replace the specific guides on this site for beeping, sounding, setting failures and restore messages, it sits above them and helps you decide which one you actually need.
The aim is not to turn you into an engineer. It is to get you to the point where you can describe your fault accurately in two sentences, which genuinely shortens the visit and means we arrive with the right battery, detector or sounder on the van.
The Checks We Ask You to Run First
Step one, transcribe the panel word for word
Not a summary, the exact wording and any numbers. Panels are more specific than people give them credit for and the wording usually names the fault category outright.
Step two, establish live or logged
Is the condition happening now, or is the panel reporting something that already happened? Live faults you can chase in real time. Logged ones need the event log's date and time.
Step three, place it on a timeline
What changed just before it started? A power cut, a storm, a new appliance, decorating, a new pet, roofing work. The timeline solves more faults than the symptom does.
Step four, narrow to one zone or the system
If a room name appears, it is a zone fault and the search area is one room. If the wording is mains, battery, line or tamper, it is a system level fault and the room does not matter.
Step five, test the boring things first
Doors properly latched, windows off the vent, detector views clear, consumer unit intact, no recent power interruption. This is where most faults are found and it costs nothing.
Step six, write your two sentence summary
For example: Pyronix panel, tamper on zone four hall since Tuesday's power cut, sets on part arm only. That sentence gets you the right engineer with the right parts.
Symptoms Worth Writing Down
Your Questions, Answered by Engineers
Working out what is actually wrong with your alarm: common questions
What Sits Behind the Fault
Standby battery ageing
The single most common root cause across all alarm faults, because a tired battery produces mains faults, odd behaviour and unexplained activations under load.
Mechanical drift on doors and windows
Contacts fall out of alignment as frames move with the seasons, producing setting failures and intermittent zone faults that appear to have no cause.
Detector age and siting
Old detectors and detectors fighting heat sources or sunlight generate false activations that get blamed on the panel rather than the device.
Water and weather at external equipment
Bell boxes and external detectors take Kent weather year round, and water ingress causes tampers, false sounding and corroded connections.
Communication path changes
New broadband, a new router or a changed phone line breaks a monitoring or app path, which shows as a line fault long after the change was made.
Programming that no longer fits the building
Extensions, changes of use and new occupiers leave zone programming describing a building that no longer exists, so behaviour looks illogical.
When DIY Ends and We Take Over
Keeping it from coming back
Keep a single page with your panel make and model, who installed it, who monitors it, where the codes are held and the date of the last service. That page turns every future fault from an archaeology project into a fifteen minute conversation, and it is the cheapest maintenance measure there is.
More Free Guides From Our Engineers
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- Two different faults, release failure and holding failure, and how to tell them apart
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