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9. 4.
Checklist
Check description
High and low pressure values
1
are normal.
Drain water is discharged
2
smoothly through the drain
hose.
Indoor and outdoor unit fans
3
are operating.
Compressor operates after
4
the indoor unit operates.
Difference between inlet and
5
outlet temperatures is normal.
6
Error is not displayed
En-21
Check method
Criteria
Cooling: low pressure
Check it with a pres-
approx. 0.8 MPa
sure gauge.
Heating: high pressure
approx. 3.0 MPa
Check it by pouring
―
water.
Check them visually.
―
Check the operating
―
sound.
Measure the inlet and
Temperature difference
outlet temperatures.
10 degrees
Check the 7 segment
Error blinking or no error
display
code display
10. LED Status
You can determine the operating status by the lighting up and blinking of the LED dis-
play.
Check the status using the table below.
10. 1. Normal operation mode
Mode
CODE
C L
Cooling
H
t
Heating
o
r During oil recovery operation
Operation
d
F During defrosting operation
P C During power saving operation
L
n During low noise operation
10. 2. Error codes
Mode
CODE
Communication
E
1
4.
2
error
E
1
4.
5
E
2
2.
1
E
2
4.
2
Function setting
E
2
6.
1
error
E
2
8.
1
E
2
8.
4
Indoor unit
E
5
U.
1
actuator error
E
6
2.
3
E
6
2.
6
E
6
2.
8
Outdoor unit
E
6
3.
1
PCB/Electrical
E
6
7.
2
component/
Switch error
E
6
8.
2
E
6
9.
1
E
7
1.
1
E
7
2.
1
E
7
3.
3
E
7
4.
1
Outdoor unit
E
7
5.
1
sensor error
E
7
7.
1
E
8
4.
1
E
8
6.
1
E
8
6.
3
E
9
3.
1
E
9
4.
1
E
9
5.
5
Outdoor unit
E
9
7.
1
actuator error
E
9
7.
4
E
9
7.
5
E
9
A.
1
E
A
1.
1
E
A
3.
1
Refrigerant
system error
E
A
4.
1
E
A
5.
1
E
A
C.
4
DESCRIPTION
DESCRIPTION
Outdoor unit network communication 2 error
The number of indoor unit shortage
Indoor unit capacity error
Connection unit number error (Indoor unit)
Indoor unit duplicate address error
Auto address setting error
Signal amplifi er auto address error
Indoor unit miscellaneous error
Outdoor unit EEPROM access error
Outdoor unit inverters communication error
Outdoor unit EEPROM data corruption error
Outdoor unit inverter error
Outdoor unit inverter PCB power short interrup-
tion error
Outdoor unit rush current limiting resister temp.
rise error (protective operation)
Outdoor unit transmission PCB parallel com-
munication error
Outdoor unit discharge temp. thermistor 1 error
Outdoor unit compressor temp. thermistor 1 error
Outdoor unit heat ex. liquid temp. thermistor error
Outside air temp. thermistor error
Outdoor unit suction gas temp. thermistor error
Outdoor unit heat sink temp. thermistor error
Outdoor unit current sensor 1 error
(permanent stop)
Outdoor unit discharge pressure sensor error
Outdoor unit suction pressure sensor error
Outdoor unit inverter compressor start up error
Outdoor unit trip detection
Outdoor unit compressor motor loss of synchro-
nization
Outdoor unit fan motor 1 lock error
Outdoor unit fan motor 1 undervoltage error
Outdoor unit fan motor 1 temperature error
(protective action)
Outdoor unit coil 1 (expansion valve 1) error
Outdoor unit discharge temperature 1 error
(permanent stop)
Outdoor unit compressor 1 temperature error
Outdoor unit high pressure error
Outdoor unit low pressure error
Outdoor unit heat sink temperature error
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