Daikin RZQG71L9V1, Service Manual

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Troubleshooting by Remote Controller ESIE15-13C
140 Service Diagnosis
4.14 High Pressure Abnormality (Detected by the High
Pressure Switch)
Remote
Controller
Display
E3
Applicable
Models
RZQG71~140
Method of Error
Detection [In cooling]
 Detect the continuity of high pressure switch (S1PH) with the protection device circuit.
 The error is detected by the outdoor unit intermediate heat exchanger thermistor (R5T).
[In heating]
 Detect the continuity of high pressure switch (S1PH) with the protection device circuit.
 The error is detected by the indoor unit intermediate heat exchanger thermistor (R3T).
Error Decision
Conditions
 When the high pressure switch is activated (4.0 MPa)
 When the outdoor unit intermediate thermistor (R5T) detects the pressure shown below.
3.92 MPa or more continuously for one minute
(Reference: equivalent saturation temperature 62°C)
 When the indoor unit intermediate thermistor (R3T) detects the pressure shown below.
3.92 MPa or more continuously for one minute
(Reference: equivalent saturation temperature 62°C)
Supposed
Causes
 Stop valve is not opened

Harness breaking or poor connector connection of the high pressure switch

Defective high pressure switch
 Indoor unit suction filter is blocked (In heating)
 Defective high pressure switch

Defective indoor unit fan (In heating)

Outdoor heat exchanger is dirt (In cooling)
 Defective outdoor unit fan (In cooling)
 Overcharge of refrigerant

Defective outdoor unit PCB (A1P)