light on QEL not lit when calibrating

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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.
Calibration is an internal process of the QEL device when energized the 1st time.  The solenoid will pull and drop 3 times on a standard calibration.  Calibration can be forced by pr...
Check that the reader is fully seated into the front escutcheon.
Check that there are no bent pins in the reader connector.
Check that the through door ribbon cable is properly plugged in.
Check that the battery or wired power is properly connected.
Check that the batteries are inserted into the battery holder in the correct polarity orientation.
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...
The following items may cause the  PS900 series power supply to have no DC output voltage. 1. If  the DC voltage selection jumper is missing, the power supply will not provide any D...
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...
This change was implemented in firmware package CO.A.6 (or later) to help the customer in the communication and coupling process between the CO200 (CO250) and the hand held device (HHD). ...
The green LED is to be lit up until the spindle (Triangles and Key Switch) are aligned properly; providing a visual indication of the problem.  
If the mechanical alignment of the triangles on the back of the outside escutcheon are not aligned, the CO200 or CO250 will not connect with the SUS/HHD and will appear to be unresponsive...
In firmware CO.A.6 (or later) the Schlage button on the CO200 (CO250) will turn green anytime that the spindle triangles on the front escutcheon are out of alignment or the mechanical key switch is...
When unlocking the CO200 door by mechanical key override, the green led will be continuously ON until the key is released. This will occur after firmware CO.A.6 (or later) has been installed int...