Njoy Balder 1500, User Manual

32

33

Troubleshooting

7

Problem

Possible Cause Solutions

No indication and alarm 

even though the main is 

normal.

The AC input 

power is not 

connected well.

Check if input 

power cord is 

firmly connected 

to the mains.

The AC input is 

connected to the 

UPS output.

Plug the AC input 

power cord to the 

AC input correctly.

The icon 

 and the 

warning code 

EP

 are 

flashing on LCD display 

and alarm is sounding 

every second.

EPO function is 

activated.

Set the circuit in 

closed position 

to disable EPO 

function.

The icon 

 and 

 the 

warning code 

SF

 are 

flashing on LCD display. 

Alarm is sounding every 2 

seconds.

Line and neutral 

conductors of 

UPS input are 

reversed.

Rotate mains 

power socket by 

180˚ and then 

connect to UPS 

system.

The icon 

 and 

 and 

warning code 

NC 

are 

flashing on LCD display. 

Alarm is sounding every 2 

seconds.

The external or 

internal battery 

is incorrectly 

connected.

Check if all  

batteries are  

connected well.

Fault code is shown as 27 

on LCD display and alarm 

is continuously sounding.

Battery voltage 

is too high or the 

charger is fault.

Contact service 

unit.

Problem

Possible Cause Solutions

Fault code is shown as 28 

on LCD display and alarm 

is continuously sounding.

Battery voltage 

is too low or the 

charger is fault.

Contact service 

unit.

The icon 

 and 

the warning code 

OL

 are 

flashing on LCD display. 

Alarm is sounding every 

second.

UPS is 

overloaded.

Remove excess 

loads from UPS 

output.

UPS is 

overloaded. 

Devices 

connected to 

the UPS are fed 

directly by the 

electrical network 

via the Bypass.
After repetitive 

overloads, the 

UPS is locked 

in the Bypass 

mode. Connected 

devices are fed 

directly by the 

mains.

Remove excess 

loads from UPS 

output first. Then 

shut down the 

UPS and restart it.

Fault code is shown as 49 

on LCD display and alarm 

is continuously sounding.

UPS is over input 

current.

Remove excess 

loads from UPS 

output.

Fault code is shown as 43 

and the icon 

 is lighting 

on LCD display. Alarm is 

continuously sounding.

The UPS 

shut down 

automatically 

because of 

overload at the 

UPS output.

Remove excess 

loads from UPS 

output and restart 

it.

Fault code is shown as 14 

on LCD display and alarm 

is continuously sounding.

The UPS 

shut down 

automatically 

because short 

circuit occurs on 

the UPS output.

Check output 

wiring and if 

connected devices 

are in short circuit 

status.

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