Try to turn off the ups and the main source and unscrew the screw from the smnp card if you hav than re insert it back again than you will turn on the main source after than turn on the ups.. if it still not workin it i assure that it your ups havin a hardware issure call the service line and ask for the maintainence...
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Try to turn off the ups and the main source and unscrew the screw from the smnp card if you hav than re insert it back again than you will turn on the main source after than turn on the ups.. if it still not workin it i assure that it your ups havin a hardware issure call the service line and ask for the maintainence...