Troubleshooting Table :

Problems	Possible cause	Solution
Can not work in mains mode. Alarm every 4 second.	Mains failure	Check the AC voltage and frequency.
	Fuse burned on the board or on rear panel	Change the fuse and reset.
When the mains failure output will be disconnect.	Battery charge is not enough	Recharging for 6 hours then test again.
	Battery damaged	Replace battery
No output	Overload or short circuit	Check output and load size
Battery discharging is less than standard	Battery charge is not enough	Recharging for 6 hours then test discharging time
	Overload	Check load size
	Battery damaged	Replace battery.