9
8
MEL Troubleshooting
20
If necessary, troubleshoot operation (LED is only visible with the mechanism case removed)
Power at
the MEL
MEL Response
Condition/Solution
24 VDC
LED - solid green
Latchbolt - retracted
Operation normal, latch retracted immediately
LED - solid red after latchbolt
attempts to retract multiple
times
Latchbolt cannot fully retract mechanically
Remove power. Depress pushbar and make sure
latchbolt retracts and extends fully. If necessary,
disconnect any vertical rods or mortise lock from
device center case, and reapply power. If motor
holds, mechanical adjustments may be required
per the device instructions.*
LED - flashing green/red
Latchbolt - not retracted
Excessive tamper (while power applied, the
pushpad was pulled out at least 3 times)
Wait 15 seconds and latchbolt will retract again OR
remove and reapply power to clear condition.
24 VDC low
LED - flashing green
Latchbolt - retracted
Voltage low during latchbolt retraction
(latchbolt retracts at reduced force)
Wire length is too long, wire gauge is too small, or
power supply has poor regulation.
29 VDC or
greater
LED- flashing red
Latchbolt - will not retract
Input voltage is too high for proper operation
Wrong power supply, power supply defective.
13 VDC or
lower
Input voltage is too low for proper operation
Wrong power supply, power supply defective or not
set to the proper output voltage.
To set, remove AC power from power supply,
change power supply setting from 12 to 24 VDC,
then reapply AC power and verify proper operation.
0 VDC
LED - off
Latchbolt - not retracted
No input voltage
Problem with the power supply, control switch, or
wiring.
*For information about adjusting exit devices, you can find their installation instructions in the
support area at www.allegion.com/us or call Technical Services at 1-877-671-7011
LED
on Device
