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Relay Panel Time Clock unit, SERPTC411, has a blank time clock display.

Issue:
Relay Panel Time Clock unit, SERPTC411, has a blank time clock display.  The green/yellowLCD backlight is working, but there are no visible letters or numbers on the screen.  

Product Line:
Schneider Electric Relay Panels

Environment:
Commercial or Institutional Building

Cause:
Hardware failure.  There is no possible adjustment for screen contrast that would allow one to recover the display.

Resolution:
Verify that that there is 24VAC connected to the L and N terminals in the lower left corner of the device.  Verify that the panel and device are properly grounded.  Cycle the line voltage supply power to the device.  The Run light should be red when power is turned on turned on.   After checking these items, if the SERPTC411 Time Clock display is still blank, then the controller must be bad. unit must be replaced.   Warranty period is 18 months from purchase data.  Contact your Schneider Electric Dealer for warranty replacement if applicable.
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