Cranbrook, Kent · TN17
Access fobs or cards stopped working: causes and fixes
Get staff or residents back through the door. This page covers the causes worth checking on perimeter beam systems, what you can safely check yourself, and what an engineer does on the visit.
- Fault: access fobs or cards stopped working
- System in view: perimeter beam system
- Priority: worth dealing with quickly rather than leaving over a weekend
Symptom
Some fobs work, others do not
Check first
Note whether the reader beeps or stays silent
Likely cause
Fob demagnetised or physically cracked
What you are likely seeing
Put plainly, the goal is that get staff or residents back through the door.
- Some fobs work, others do not
- All fobs stopped at once
The usual culprits
- Fob demagnetised or physically cracked
- Key-ring wear breaks the internal antenna.
- Door not in the fob's access group
- A change on one door's group settings quietly excludes a whole set of users.
Security system repairs and maintenance
- System health checks
- Firmware updates
- Performance testing
Owner checks that cost nothing
These are observation jobs rather than repairs, so there is no risk in working through them.
- 1Note whether the reader beeps or stays silent
- 2Test a known-good fob on the failing door
How we put it right
In terms of priority, it is worth dealing with quickly rather than leaving over a weekend.
- 1Leave you a written user list so leavers can be removed quickly
- 2Restore or rebuild the user database and export a backup you keep
On perimeter beam systems, the parts that matter here
A perimeter beam system behaves differently from the rest, so the check order changes.
- Transmitter and receiver pair
- Forms the detection beam between two fixed points.
- Mounting posts or wall brackets
- Hold the units at a consistent height and alignment.
The honest boundary here
Wildlife crossing the line is a common source of false alarms. Alignment checked periodically, especially after storms, and vegetation kept clear of the beam path.
The consequence on a home with an integral garage
- Any side personnel door into the garage separate from the main vehicle door
- That is the access route that needs to be covered reliably, which is why access fobs or cards stopped working there is worth fixing rather than living with.
- Detection on the garage door itself
- Covers the largest single opening on many houses, which is otherwise left completely outside the alarm system.
So it does not happen again
Keep an exported copy of the user database off the controller, it turns a re-programming visit into a five-minute restore.
Cranbrook context
In Cranbrook (TN17) we work regularly around High Street and Stone Street. Reached via the A229 with Staplehurst station for rail.
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Related services
- Security system repairs and maintenance
- Burglar alarm installation
- CCTV installation
- WiFi installation and coverage fixes
Covering Chatham, Medway, Kent & South East London
Cranbrook questions we get asked
Access fobs or cards stopped working: causes and fixes
Local detail for Cranbrook
- Takeover and repair of systems installed by others
- Domestic and commercial work handled by the same team
- Equipment chosen for the site rather than a single brand list
Describe the symptom, get a straight answer
Read us the wording on the keypad or the screen and we can usually narrow it to one or two possibilities.
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