ACCESS CONTROL
Maglock Troubleshooting:
Real-World Tips from 10 + Years in the Field
» IF YOU’ VE EVER FOUND YOURSELF scratching your head over a faulty maglock, you’ re not alone. After over a decade working hands-on with access control systems across commercial, industrial, and residential sites, I’ ve seen every kind of maglock issue you can imagine. Fortunately, many of these problems have straightforward fixes— if you know what to look for.
In this post, I’ ll walk you through some of the most common maglock issues and how to troubleshoot them.
1. Why Is My Maglock Not Locking?
This is by far the most common maglock question we get— and for good reason. A maglock that doesn’ t lock can leave a building vulnerable. Here’ s a checklist to help pinpoint the cause:
Is There 12V or 24V DC at the Maglock?
If there’ s no power at the lock, it can’ t operate. Remove the maglock’ s cover plate and use a multi-meter to check for voltage at the terminals. Confirm that your power supply is functioning and that you’ re testing the correct wires. Is the Cable Properly Terminated?
Loose or incorrectly terminated cables will prevent voltage from reaching the lock. Check the terminal screws are tight. Gently pull on each wire to ensure its secure and not slipping out of the terminal block.
Are the Jumpers Set Correctly?
Many maglocks can run on 12V or 24V DC. They include small jumpers inside the housing that configure the lock for the supplied voltage. Send 24V to a lock set for 12V, you risk damaging it. Supply
12V to a lock set for 24V, it might not work at all. Always verify that jumper settings match your power supply.
Could External Devices Be Interrupting Power?
A lot of people jump to replace the maglock itself when the issue is external. Before doing so, check:
• Emergency door release units
• Fire alarm interfaces
• Push-to-exit buttons( especially if stuck)
• Access control relays( could be latched open)
These components can break the power to the maglock and make it seem like the lock is faulty when it’ s not.
Is the Armature Plate Properly Aligned?
The magnet only works if it makes full contact with the armature plate. If the plate is missing, or is installed incorrectly, the lock may not hold or engage. A quick test: use a metal object like a file. If it sticks firmly to the energised magnet, the lock itself is fine— the issue is likely alignment.
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OCTOBER 2025
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