SiUS281811EA Troubleshooting by Error Codes
Part 6 Service Diagnosis 255
4.30 Activation of Low Pressure Sensor
Error Code E4
Applicable
Models
All outdoor units
Method of Error
Detection
Abnormality is detected by the pressure value with the low pressure sensor.
Use the outdoor main PCB to determine the low pressure sensor pressure test value.
Error Decision
Conditions
Error is generated when the low pressure drops below a specific pressure level.
Low pressure drops after compressor activation.
Operating pressure: 0.07 MPa (10.2 psi)
Supposed
Causes
Abnormal drop of low pressure
Defective low pressure sensor
Defective outdoor main PCB
Stop valve is not opened
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