No light on QEL

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Answer
A red and green flashing LED's on a QEL indicates the device has been tampered with while power was applied, the push pad was pulled out at least three time. Wait 15 seconds and latchbolt will retr...
The push bar being pulled out three times while power is applied causes the lights to flash and the device to stop retracting.
Check to make sure there is no bind of the latch.
Make sure the lock AA batteries are good. 4.8 VDC or higher.
When in its “Active state”, the mechanical key switch can prevent USB connection. Make sure the lock key cylinder and tailpiece are properly installed.
Make sure the mechanical triangles on the back of the outside escutcheon are aligned properly.  See the installation instructions at www.schlage.com/support Schlage Technical Support.&nbs...
If the Schlage Utility Software pops up a "E201 error", just ignore it, and tap "Device Options" or update your firmware. See 78451  
Make sure the HHD/SUS is set to USB communication by checking the small icon right of the "No Device Connected" message.  The symbol should be a USB symbol when working with USB enable product...
Chexit devices shipped prior to 8-24-2015 with solenoid driven could cause the Von Duprin CX solenoid to pull and drop and sound the alarm with solid LED or no LED light after the rear...
Verify that the 120VAC is present at the controller (measure 120VAC on the 2 wire gray cable from I/O board to controller -- red/black wires in gray cable). If present, but no lights on the contr...
The 900-2Q board is no longer available. For warranty purposes, QEL conversion kit and 900-2RS board are required. The 900-2RS replaces the 900-2Q board.
SD is Special cylinder dogging in the center case of 98/99 rim and vertical rod non fire rated devices and is available with standard, EL, QEL, CX and ALK.
  Pushing on the push  bar or activating the EL/QEL or the trim on Von Duprin XP98/99 exit device does not retract the latch, it releases the latch only. Door must be pushed or pulled when device o...