Troubleshooting by Remote Controller ESIE15-13B
142 Service Diagnosis
4.15 Actuation of Pressure Sensor
Remote
Controller
Display
E4
Applicable
Models
RZQG
Method of Error
Detection
Detect the continuity of low pressure switch (S2PL) with the protection device circuit.
[In cooling]
Detect error by the indoor unit intermediate thermistor (R3T).
[In heating]
Detect error by the intermediate heat exchanger thermistor (R5T).
Error Decision
Conditions
When the low pressure switch is activated.
When the detection pressure is the following value
0.12MPa or less continues for 5 minutes
(When the saturated pressure equivalent temperature is –34°C). This is explain for
“0.12MPa”.
Supposed
Causes
The stop valve is not opened
Disconnection of outdoor unit intermediate thermistor
Disconnection of indoor unit intermediate thermistor
Defective thermistor
Defective outdoor unit PCB (A1P)
Abnormal drop of low pressure
Refrigerant shortage
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