| Problem | Possible cause | Remedy |
| No indication, no warning tone even though system is connected to mains power supply | No input voltage | Check building wiring socket outlet and input cable |
| Bypass switch has disconnected[for 6K(S)/ 10K(S)] | Set the Bypass switch to “ON” | |
| LINE LED blinks | Phase and neutral conductor at input of UPS system are reversed | Rotate mains power socket by 180° or connect UPS system according to chapter 5 “Connection and operation” |
| LINE-LED blinks and BATTERY-LED lights up | Input power and/or frequency are out of tolerance | Check input power source and inform dealer if necessary |
| LINE and BYPASS LED light up even though the power supply is available | Inverter not switched on | Press On-Switch “I” |
| INVERTER LED lights up, and audible alarm sounding every 1 or 4 seconds | Mains power supply has failed | Switching to battery mode automatically. When audible alarm sounding every second, battery is almost empty |
| INVERTER LED lights up, warning tone at intervals of every 1 or 4 seconds, mains power supply available[for 6K(S)/ 10K(S)] | Bypass switch disconnected | Set the Bypass switch to “ON”. If the problem persists, please inform your dealer |
| FAULT LED lights, warning tone once a second | Overload | Remove loads of UPS output |
| FAULT-LED lights up, permanent warning tone | UPS fault | Notify dealer!! |
| Emergency supply period shorter than nominal value | Batteries not fully charged / batteries defect | Charge the batteries for at least 1 - 2 hours and then check capacity. If the problem still persists, consult your dealer |
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