Possible cause:The bypass switch has been turned on manually or through an accessory.
1)If bypass is the chosen mode of operation, ignore the illuminated LED.
2)If bypass is not the chosen mode of operation move the bypass switch on the back of the UPS, to the normal position.
1)If bypass is the chosen mode of operation, ignore the illuminated LED.
2)If bypass is not the chosen mode of operation move the bypass switch on the back of the UPS, to the normal position.