The V Guard DU 1000 Smart User Manual prints these in bold red letters. They are crucial for safety.
The following specifications define the performance envelope of the device:
| Protection | Action | |------------|--------| | Over-voltage | Disconnects output when input > 290V | | Under-voltage | Disconnects output when input < 140V | | Overload | Cuts output if load exceeds 1100 VA | | Over-temperature | Shuts down if internal temp > 75°C | | Short circuit | Fuse / electronic trip | v guard du 1000 smart user manual
After fault clear, unit resets automatically (time delay active).
The user manual recommends a strict maintenance routine. V Guard specifically designed the "Smart" series for less maintenance, but some checks are mandatory. The V Guard DU 1000 Smart User Manual
Important: For A/C units, keep the stabilizer powered but appliance OFF for 3 minutes after power restoration to allow gas pressure equalization.
Located near the AC input. Use a pointed object (pen) to press it. After fault clear, unit resets automatically (time delay
| Display Code | Meaning | Solution | |--------------|---------|----------| | E1 | Under voltage (<140V) | Check mains supply; use only when grid stable. | | E2 | Over voltage (>290V) | Call electrician – possible neutral failure. | | E3 | Overload / Short circuit | Reduce load (disconnect appliance) → reset unit. | | E4 | Internal temperature high | Improve ventilation; turn off for 30 minutes. | | E5 | Output relay stuck | Contact V-Guard service center. | | --- | No output but mains present | Check input fuse inside unit (requires technician). |
(Specific LED patterns may vary slightly by hardware revision, but standard logic applies)