SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 235
5.26 Activation of Low Pressure Sensor
Applicable
Models
All outdoor unit models
Error Code E4
Method of Error
Detection
Make judgment of pressure detected by the low pressure sensor with the outdoor unit main
PCB.
Error Decision
Conditions
When low pressure caused a drop while the compressor is in operation:
Operating pressure: 0.07 MPa
Supposed
Causes
Abnormally drop in low pressure
Defective low pressure sensor
Defective outdoor unit main PCB
The stop valve is not opened
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