SiBE281013
Troubleshooting by Remote Controller
Service Diagnosis
121
4.13.2 RZQG125, 140
Remote
Controller
Display
E3
Applicable
Models
RZQG125, 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 (A2P)
Defective outdoor unit PCB (A1P)
