Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 104
3.16 “E4” Outdoor Unit: Actuation of Low Pressure Sensor
Remote
Controller
Display
E4
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Abnormality is detected by the pressure value with the low pressure sensor.
Malfunction
Decision
Conditions
Error is generated when the low pressure is dropped under specific pressure.
Operating pressure:10psi
Supposed
Causes
 Abnormal drop of low pressure (Lower than 10 psi)
 Defect of low pressure sensor
 Defect of outdoor unit P.C.B.
 Stop valve is not opened.