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9. 3. Checklist
Check description
High and low pressure
1
values are normal.
Drain water is dis-
2
charged smoothly
through the drain hose.
Indoor and outdoor unit
3
fans are operating.
Compressor operates after
4
the indoor unit operates.
Difference between inlet
5
and outlet temperatures
is normal.
6
Error is not displayed
10. LED Status
You can determine the operating status by the lighting up and blinking of the 7 seg-
ment LED indicator.
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 peak cut operation
L
n During low noise operation
S n During setting of snowfall mode
10. 2. Error codes
Mode
Code
E 1 3. 1 Communication error between outdoor units
E 1 4. 1 Outdoor unit network communication 1 error
Communication error
E 1 4. 2 Outdoor unit network communication 2 error
E 1 4. 5 The number of indoor unit shortage
E 2 8. 1 Auto address setting error
Function setting error
E 2 8. 4 Signal amplifier auto address error
Indoor unit actuator error E 5 U. 1 Indoor unit miscellaneous error
E 6 1. 5 Outdoor unit reverse/ missing phase & wiring error
E 6 2. 3 Outdoor unit EEPROM access error
E 6 2. 6 Outdoor unit inverters communication error
E 6 2. 8 Outdoor unit EEPROM data corruption error
E 6 3. 1 Outdoor unit inverter error
Outdoor unit PCB/Elec-
trical component/ Switch
E 6 7. 2
error
E 6 8. 1 Outdoor unit magnetic relay error
E 6 8. 2
E 6 9. 1
E 7 1. 1 Outdoor unit discharge temp. thermistor 1 error
E 7 1. 2 Outdoor unit discharge temp. thermistor 2 error
E 7 2. 1 Outdoor unit compressor temp. thermistor 1 error
E 7 2. 2 Outdoor unit compressor temp. thermistor 2 error
E 7 3. 3 Outdoor unit heat ex. liquid temp. thermistor error
E 7 4. 1 Outside air temp. thermistor error
E 7 5. 1 Outdoor unit suction gas temp. thermistor error
E 7 7. 1 Outdoor unit heat sink temp. thermistor error
Outdoor unit sensor
E 8 2. 1
error
E 8 2. 2
E 8 3. 1 Outdoor unit liquid pipe temp. thermistor 1 error
E 8 3. 2 Outdoor unit liquid pipe temp. thermistor 2 error
E 8 4. 1 Outdoor unit current sensor 1 error (permanent stop)
E 8 6. 1 Outdoor unit discharge pressure sensor error
E 8 6. 3 Outdoor unit suction pressure sensor error
E 8 6. 4 Outdoor unit high pressure switch 1 error
E 8 6. 5 Outdoor unit high pressure switch 2 error
En-23
Check method
Criteria
Cooling: low pressure ap-
Check it with a
prox. 0.8 MPa
pressure gauge.
Heating: high pressure ap-
prox. 3.0 MPa
Check it by pour-
―
ing water.
Check them visu-
―
ally.
Check the operat-
―
ing sound.
Measure the inlet
Temperature difference 10
and outlet temper-
degrees
atures.
Check the 7
Error blinking or no error
segment LED
code display
indicator
Description
Description
Outdoor unit inverter PCB power short interruption
error
Outdoor unit rush current limiting resister temp. rise
error (protective operation)
Outdoor unit transmission PCB parallel
communication error
Outdoor unit sub-cool heat ex. gas inlet temp.
thermistor error
Outdoor unit sub-cool heat ex. gas outlet temp.
thermistor error
E 9 2. 1 Outdoor unit compressor 2 error
E 9 2. 2 Outdoor unit compressor 2 current value error
E 9 3. 1 Outdoor unit inverter compressor start up error
E 9 4. 1 Outdoor unit trip detection
Outdoor unit actuator
E 9 5. 5 Outdoor unit compressor motor loss of synchronization
error
E 9 7. 1 Outdoor unit fan motor 1 lock error
E 9 7. 4 Outdoor unit fan motor 1 under voltage
E 9 7. 5
E 9 U. 2 Outdoor slave unit error
E A 1. 1
E A 2. 1
E A 3. 1 Outdoor unit compressor 1 temperature error
E A 3. 2 Outdoor unit compressor 2 temperature error
Refrigerant system error
E A 4. 1 Outdoor unit high pressure error
E A 4. 2 Outdoor unit high pressure protective action 1
E A 4. 3 Outdoor unit high pressure protective action 2
E A 5. 1 Outdoor unit low pressure error
E A C. 4 Outdoor unit heat sink temperature error
7 segment LED indicator:
Outdoor unit fan motor 1 temperature error
(protective action)
Outdoor unit discharge temperature 1 error
(permanent stop)
Outdoor unit discharge temperature 2 error
(permanent stop)
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