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Failure Diagnosis
Control PCB Alarm Code
Alarm
Meaning
code
▪ Gas cooler fan motor became
abnormal.
Gas cooler fan
E271
▪ The fan rotation speed
motor anomaly
significantly deviated from the set
rotation speed.
High pressure
High pressure increased to
E311
anomaly
11.7MPa or higher and generated
(1st to 6th incident)
an abnormal stop.
Refrigerant flood
Suction gas superheat became 1 K
E32
back alarm
or below continuously for 2 min.
Intermediate
Intermediate pressure increased to
E36
pressure anomaly
8.0MPa or higher and generated
(1st to 6th incident)
an abnormal stop.
Unit outlet pressure
Unit outlet pressure increased to
anomaly
8.0MPa or higher and generated
E37
(1st to 6th incident)
an abnormal stop.
Intermediate
Increased intermediate pressure
E46
pressure anomaly
caused an intermediate pressure
(7th incident)
anomaly.
Unit outlet pressure
Increased unit outlet pressure
anomaly
caused a unit outlet pressure
E47
(7th incident)
anomaly.
Unit outlet
Unit outlet temperature sensor
E57
temperature sensor
became abnormal (open circuit
anomaly
condition).
Gas cooler outlet
Gas cooler outlet temperature
E59
temperature sensor
sensor became abnormal (open
anomaly
circuit condition).
E6∗1
The inverter operation became
Inverter anomaly
~
abnormal.
E7∗1
Split cycle outlet
Split cycle outlet temperature
temperature sensor
sensor became abnormal (open
E80
anomaly
circuit condition).
Intermediate
Intermediate pressure sensor
pressure sensor
became abnormal (open circuit
E81
anomaly
condition).
▪ Oil level switch became abnormal.
Oil level switch
▪ Both top contact and bottom
E851
anomaly
contact became short-circuited at
the same time.
Unit outlet pressure sensor
Unit outlet pressure
E88
became abnormal (open circuit
sensor anomaly
condition).
(2) Other indications
Indication
Anomaly that occurred in the past.
Alarm (Red) LED blinks
Up to 50 past alarm codes are saved in the
"Alarm history (警報履歴)".
Digital display "-CH-"
The control PCB is in the check mode.
Cause
(1) Check for the presence of a fan lock, fan dislocation, etc.
(2) Check the connection of FC3-PCB "CN2, CN3, CN4 connectors".
(3) Check the connection of the control PCB "6P1 FAN 1 connector".
(1) Investigate the cause of high pressure anomaly.
(2) Check whether the high pressure sensor has failed.
Check the cause of refrigerant flood back operation.
(1) Investigate the cause of intermediate pressure anomaly.
(2) Check whether the intermediate pressure sensor has failed.
(1) Investigate the cause of unit outlet pressure anomaly.
(2) Check whether the unit outlet pressure sensor has failed.
(1) Investigate the cause of intermediate pressure anomaly.
(2) Check whether the intermediate pressure sensor has failed.
(1) Investigate the cause of unit outlet pressure anomaly.
(2) Check whether the unit outlet pressure sensor has failed.
(1) Check the connection of the control PCB "2P5 U outlet connector (U出口)".
(2) Check the resistance value of the unit outlet temperature sensor.
Refer to "Method of Checking Sensor Characteristics".
(1) Check the connection of the control PCB "2P6 GC outlet connector
(GC出口)".
(2) Check the resistance value of the gas cooler outlet temperature sensor.
Refer to "Method of Checking Sensor Characteristics".
Follow the procedure shown in "Failure Diagnosis of Inverter Unit".
(1) Confirm whether an overload operation is occurred.
(2) Check for gas cooler fan motor anomalies (E271).
(3) Check for the presence of a power source voltage drop or loss of phase.
(4) Check if the compressor is locked.
(1) Check the connection of the control PCB "2P7 S outlet connector (S出口)".
(2) Check the resistance value of the split cycle outlet temperature sensor.
Refer to "Method of Checking Sensor Characteristics".
(1) Check the connection of the control PCB "3P2 intermediate pressure
connector (中間圧)".
(2) Check the output voltage of the intermediate pressure sensor.
Refer to "Method of Checking Sensor Characteristics".
(1) Check the connection of the control PCB "3P22 oil level 1 connector
(油面1)".
(2) Check the resistance value of the oil level switch.
Refer to "Method of Checking Resistance Value of Electronic Valve Coil and
Oil Level Switch".
(1) Check the connection of the control PCB "3P4 U outlet connector (U出口)".
(2) Check the output voltage of the unit outlet pressure sensor.
Refer to "Method of Checking Sensor Characteristics".
Meaning
Correction method
Correction method
Check the alarm code in the table above and eliminate the cause.
After correcting the abnormal content, set the knob of the rotary
switch to "Operation (運転)" position, and press ▲ button or turn
the operation switch (S1) OFF. The alarm (Red) LED on the
control PCB stops blinking.
Set the control PCB slide switch SW15 to "Control (制御)".
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