Si20-701_B Troubleshooting by Remote Controller
168
3.30
E4
Actuation of Low Pressure
Sensor
Remote Controller Display
E4
Applicable Models
CMSQ
Method of Error Detection
Abnormality is detected by the pressure value with the
low pressure sensor.
Error Decision Conditions
Error is generated when the low pressure drops while the
compressor is in operation.
Supposed Causes
Abnormal drop of low pressure
Defective low pressure sensor
Defective outdoor unit PCB
Stop valve is not opened
Clogged filter
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