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LB600PRO Luminous UPS is working on battery mode though utility/main supply is available

Probable cause: 

1. Utility power is unavailable.
2. UPS input chord is not connected properly or partially connected to utility supply.
3. UPS is sensing Low or high input voltage to operate on mains.
4. Utility power is through incompatible source like extension or surge.

Possible solution: 

1. Reconnect the power cord properly.
2. Do not use extension cord or surge suppresser at input of UPS.
3. Wait for the nominal utility supply.

In case if issue persist even after trying the above troubleshooting, log the complaint. 

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