EN - 49
EN - 48
Failure Diagnosis
Error Code
Error
code
Meaning
Cause
Correction method
E37
Unit outlet pressure
anomaly (1st to 6th
incident)
Increased unit outlet pressure caused a
unit outlet pressure anomaly.
(1) Investigate the cause of unit outlet pressure anomaly.
(2) Check for the presence of any anomalies of the unit outlet pressure
sensor.
E46
Intermediate pressure
anomaly (7th incident)
Increased intermediate pressure
caused an intermediate pressure
anomaly.
(1) Investigate the cause of intermediate pressure anomaly.
(2) Check for the presence of any anomalies of the intermediate pressure
sensor.
E47 Unit outlet pressure
anomaly (7th incident)
Increased unit outlet pressure caused a
unit outlet pressure anomaly.
(1) Investigate the cause of unit outlet pressure anomaly.
(2) Check for the presence of any anomalies of the unit outlet pressure
sensor.
E57 Unit outlet sensor
anomaly
Unit outlet temperature sensor became
abnormal (open circuit condition).
(1) Check the connection of control PCB “2P5 U outlet connector.”
(2) Check the resistance value of the unit outlet temperature sensor
(Refer to “Method of Checking Sensor Characteristics”).
E59
Gas cooler outlet
temperature sensor
anomaly
Gas cooler outlet temperature sensor
became abnormal (open circuit
condition).
(1) Check the connection of control PCB “2P6 GC outlet connector.”
(2) Check the resistance value of the gas cooler outlet temperature sensor
(Refer to “Method of Checking Sensor Characteristics”).
E6X1
~E7X1,
E6X3
~E7X3
Inverter anomaly
The inverter operation became
abnormal.
Comply with the “Failure Diagnosis of Inverter Unit.”
(1) Check if Power source is connected to power source terminal base.
(2) Confirm whether an overload operation is taking place.
(3) Check for gas cooler fan motor anomalies (E271) .
(4) Check for the presence of a power source voltage drop or power
missing phase.
(5) Check if the compressor is locked.
(6) Check if inverter A1000 output is connected to compressor.
(7) Check if inverter V1000 output is connected to fan motor.
E80
Split cycle outlet
temperature sensor
anomaly
Split cycle outlet temperature sensor
became abnormal (open circuit
condition).
(1) Check the connection of control PCB “2P7 S outlet connector.”
(2) Check the resistance value of the split cycle outlet temperature sensor
(Refer to “Method of Checking Sensor Characteristics”).
E81
Intermediate pressure
sensor anomaly
Intermediate pressure sensor became
abnormal (open circuit condition).
(1) Check the connection of control PCB “3P2 intermediate pressure
connector.”
(2) Check the output voltage of the intermediate pressure sensor (Refer
to “Method of Checking the Resistance of Electronic Expansion Valve
Coil and Oil Level Switch”).
E851 Oil level switch
anomaly
Oil level switch became abnormal.
(Both top contact and bottom contact
became short-circuited at the same
time.)
(1) Check the connection of control PCB “3P22 oil level 1 connector.”
(2) Check the resistance value of the oil level switch. When checking,
refer to “Method of Checking the Resistance of Electronic Expansion
Valve Coil and Oil Level Switch.”
E88 Unit outlet pressure
sensor anomaly
Unit outlet pressure sensor became
abnormal (open circuit condition).
(1) Check the connection of control PCB “3P4 U outlet connector.”
(2) Check the output voltage of the unit outlet pressure sensor (Refer to
“Method of Checking Sensor Characteristics”).
Indication
Meaning
Correction method
Remarks
Alarm (red) LED blinks
Anomaly that occurred in the past.
Up to 50 past error codes are
saved in the “Alarm History.”
Check the error code in the table above
and eliminate the cause.
Then, align the rotary switch (knob) to
“Operation,” and press ▲ or turn the
operation switch “OFF.”
Then, LED stops blinking.
Digital display “-CH-”
Control PCB is in the check mode. Set control PCB slide switch SW15 to
“Control.”
Set control PCB slide switch SW15
to “Check,” and DIP switch SW13-1
and SW13-6 to “ON” and supply
power to enter the check mode.
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2019/08/27 10:56:10
