Help Centre / Alarm Help
What Does an Alarm Tamper Fault Mean?
A tamper fault means your alarm system has detected that part of the system may have been disturbed, opened, damaged or interfered with. It does not always mean there has been a break-in, but it should not be ignored.
Short answer
An alarm tamper fault is a warning that the system has detected a possible issue with the physical security of one of its components. This could be a sensor cover, control panel lid, external sounder, cable, junction box or another protected part of the alarm system.
Sometimes the cause is simple, such as a loose detector cover after decorating or a contact that has been knocked. Other times, it can point to damaged wiring, a faulty device, a panel issue or an external sounder tamper.
If your alarm is showing tamper, keeps sounding, will not reset or refuses to set, Sanders Secure can help with alarm fault finding and emergency alarm callouts across Plymouth and the surrounding area.
What does a tamper fault actually mean?
Alarm systems are designed to detect more than just movement or door openings. They also monitor whether key parts of the system have been opened, removed, damaged or disturbed.
For example, many alarm detectors, control panels and external sounders have tamper switches inside them. If a cover is opened, a device is pulled away from the wall, or wiring is damaged, the system may show a tamper fault.
The important point is that a tamper fault is not the same as a normal alarm activation. It is the system saying, “something about the alarm equipment itself needs checking”.
Common causes of an alarm tamper fault
The exact cause depends on the system, the devices fitted and what the keypad is displaying. These are some of the most common reasons a tamper fault appears.
A loose detector cover
A movement detector, door contact or other device may have a cover that is not seated properly. This can happen after decorating, cleaning, knocking a device, or replacing a battery on a wireless system.
A damaged cable
On wired alarm systems, a damaged cable can create a tamper fault. This can happen during building work, DIY, loft work, carpet fitting, decorating or accidental damage.
An external sounder tamper
The bell box or external sounder normally has tamper protection. If the cover is loose, damaged, weathered or the sounder is faulty, the alarm may show a tamper warning.
A control panel lid issue
If the main alarm panel has been opened, damaged, not closed correctly or the lid tamper is faulty, the system may show a tamper fault and may need an engineer reset.
A sensor has been knocked
A detector or door contact can be disturbed by furniture, pets, moving items around, cleaning, children, tradespeople or general wear and tear.
A fault with the device itself
Sometimes the equipment itself is faulty. A worn tamper spring, failing device, damaged housing or older panel can cause repeated tamper messages.
Does a tamper fault mean someone has tried to break in?
Not always. A tamper fault means the alarm system has detected a possible issue with the alarm equipment, not necessarily that someone has broken in.
It could be caused by accidental damage, a loose cover, recent work in the property, weather-related damage to an external sounder, or a genuine attempt to interfere with the system. The keypad message and event history usually help narrow this down.
If you are unsure, treat it seriously. Do not simply ignore or bypass a tamper fault without understanding what caused it.
What you can safely check yourself
Before calling an engineer, there are a few safe checks you can make without opening the alarm system.
- Look at the keypad and write down the exact tamper message.
- Take a clear photo of the keypad display if possible.
- Check whether any sensor, keypad or contact looks visibly loose or damaged.
- Think about whether any decorating, cleaning, DIY or building work has recently taken place.
- Check whether any doors or windows have recently been forced, slammed or adjusted.
- Look from the ground to see whether the external sounder cover looks damaged or hanging loose.
- Note whether the alarm is still sounding, refusing to set, or asking for a reset.
- Check whether the same fault keeps returning after it has been cleared.
Tip: Do not remove covers to “have a look”. Opening a detector, keypad, panel or sounder can trigger further tamper faults and may make the system harder to reset.
What not to touch
To avoid making the fault worse, there are some things you should not do unless you are competent, authorised and know the system.
- Do not open the main alarm panel.
- Do not open detectors, contacts or keypads.
- Do not disconnect the backup battery.
- Do not remove the external sounder cover.
- Do not try random engineer codes found online.
- Do not repeatedly power the alarm on and off.
- Do not twist, join or disconnect alarm cables.
- Do not permanently bypass the fault without understanding what protection is being removed.
A tamper fault exists for a reason. Clearing the message without finding the cause can leave the system unreliable or partly unprotected.
Can the alarm still be set with a tamper fault?
Sometimes a system may allow a user to omit or bypass a fault, but this depends on the alarm, how it has been programmed and the type of tamper present.
Even if the alarm can still be set, a tamper fault should be treated as a warning that something needs checking. Bypassing or ignoring the fault may leave part of the property unprotected or hide an underlying issue.
If your alarm will not set because of a tamper fault, our guide on why a burglar alarm will not set may also be useful.
When to call an alarm engineer
You should arrange a visit if the tamper fault will not clear, keeps returning, causes the alarm to sound, stops the system from setting, or appears after a device, cable, panel or external sounder has been disturbed.
It is also worth booking an engineer if the system is older, has not been serviced recently, or if you are not sure whether the fault is genuine, accidental or equipment-related.
Fault will not clear
If the tamper message stays on the keypad, the system may need fault finding or an engineer reset.
Fault keeps returning
Repeated tamper faults usually mean something is loose, damaged, faulty or being disturbed.
Alarm will not set
If the alarm refuses to set because of tamper, it should be checked before relying on the system.
Sanders Secure provides alarm repairs and fault finding, as well as alarm servicing and maintenance for homes and businesses in Plymouth, South Devon and Cornwall.
How Sanders Secure can help
When we attend an alarm with a tamper fault, we aim to find the cause rather than simply clearing the warning.
- Checking the keypad message and event history.
- Identifying which device or zone is causing the tamper.
- Checking detector covers, contacts and tamper switches.
- Testing wiring where a cable fault is suspected.
- Checking the main panel and backup battery where appropriate.
- Inspecting external sounder faults where safely accessible.
- Testing the system after repair or reset.
- Advising whether repair, servicing or replacement is the best option.
If the alarm is older or has repeated tamper issues, we will explain the practical options clearly. Sometimes a simple repair is enough. In other cases, an upgrade may be more reliable long term.
Related help and services
If your alarm is showing a tamper fault, these pages may also be useful.
Why won’t my alarm set?
Useful if the tamper fault is stopping the system from arming.
Alarm repairs and callouts
For alarms showing tampers, reset issues, battery warnings or repeated faults.
Alarm servicing and maintenance
For routine servicing, system checks, batteries, takeovers and maintenance visits.
Help Centre
Return to the main Help Centre for user guides and support information.
Frequently asked questions
These are some of the common questions we are asked about alarm tamper faults.
Need help with an alarm tamper fault?
If your burglar alarm is showing tamper, will not reset, keeps sounding or refuses to set, contact Sanders Secure for practical alarm support in Plymouth and the surrounding area.
