SiBE281013
Troubleshooting by Remote Controller
Service Diagnosis
119
4.13 High Pressure Abnormality (Detected by the High
Pressure Switch)
4.13.1 RZQG71, 100
Remote
Controller
Display
E3
Applicable
Models
RZQG71, 100
Method of Error
Detection
[In cooling]
The error is detected by the outdoor unit intermediate heat exchanger thermistor (R5T).
[In heating]
The error is detected by the indoor unit intermediate heat exchanger thermistor (R3T).
Error Decision
Conditions
[In cooling]
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)
[In heating]
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
Dirt and blockage of the outdoor unit heat exchanger
Defective outdoor unit fan motor
Defective indoor unit fan motor
Defective electronic expansion valve
Overcharge of refrigerant
Defective indoor unit PCB
Defective outdoor inverter unit PCB
Troubleshooting
Are the
characteristics of the
outdoor unit intermediate
thermistor normal?
Replace the outdoor unit
intermediate heat exchanger
thermistor.
NO
YES
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
The
outdoor unit heat
exchanger is clogged or
blocked.
Clean or remove the clocking
item.
YES
NO
The
outdoor unit fan is
rotating during operation.
Remove the foreign matter.
Replace the fan motor.
NO
YES
[In cooling]
A
