Troubleshooting by Remote Controller Si20-701_B
173
3.31
E4
Low Pressure System
Abnormality
Remote Controller Display
E4
Applicable Models
RZQ-C
Method of Error Detection
Detect errors by the low pressure sensor.
Error Decision Conditions
When the detection pressure is the following value
Actuating pressure: 0.07MPa
Supposed Causes
Defective low pressure switch
Disconnection of the wire harness of the low pressure
switch
Defective connection of the connector of the low
pressure switch
The refrigerant piping circuit abnormality
The stop valve is not opened
Defective outdoor unit main PCB
Refrigerant shortage
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