dooch NSQ Series, Manual

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Troubleshooting
Er-04 (
Low water Level Alarm-tUL)
)
Cause
It is an alarm generated to prevent the mechanical seal from being damaged due to running of the pump when there is
no water on the suction side. It is generated when the low levelsensor (electrode) does not detect the water. In case
of not using the low water level sensor, the software generates the alarm when the current pressure is maintained
under the low pressure alarm level (Pr-75)and operation continues for low pressure trip time(Pr-74).
Reaction
Air Vent
Inlet Air Valve
Communication
Check if the water tank (water reservoir) is filled with water.
Check if there is any water by opening the air cock of the pump.
After relea sing error by pressing key, press key to start the pump