Shenzhen Envicool Technology Co., Ltd.
The control system can display the alarm information. The special alarms can be selected through
the optional alarm list. The alarm will automatically reset after removed.
5.1 Alarm: interpretation & troubleshooting
The following contents introduce the possible causes for each alarm and explain the methods of
troubleshooting. For detailed explanation, please refer to Chapter 8 ā Troubleshooting.
5.1.1 High-pressure alarm
High pressure of the compressor is monitored by the high-pressure switch. If the high pressure
exceeds 4.0MPa , and the pressure switch acts, the controller will alarm and shut down the
compressor. The alarm will be automatically eliminated when the high pressure is canceled.
When the high-pressure alarm appears, please detect whether power supply of the outdoor unit
is off, the fan speed controller is normal, the fan of the outdoor unit works normally, the
high-pressure switch is damaged, the coil of the outdoor unit is dirty and blocked, etc.
Low pressure of the compressor is monitored by the low-pressure sensor. If the low pressure is
lower than 2.5MPa during the operation of the unit, the controller will send an alarm signal and
turn off the compressor. The alarm will be automatically eliminated when the low pressure is
canceled.
When the low-pressure alarm appears, please detect whether refrigerant leaks, fan of the
indoor unit works normally, low-pressure switch is damaged, expansion valve is normal, etc.
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