En-21
9. 4. Checklist
Check description Check method Criteria
1
High and low pressure
values are normal.
Check it with a
pressure gauge.
Cooling: low pressure approx.
116 psi (0.8 MPa)
Heating: high pressure approx.
435 psi (3.0 MPa)
2
Drain water is discharged
smoothly through the drain
hose.
Check it by pour-
ing water.
―
3
Indoor and outdoor unit
fans are operating.
Check them visu-
ally.
―
4
Compressor operates after
the indoor unit operates.
Check the operat-
ing sound.
―
5
Difference between inlet
and outlet temperatures is
normal.
Measure the
inlet and outlet
temperatures.
Temperature difference 10 degrees
6 Error is not displayed
Check the 7 seg-
ment LED display
Error blinking or no error code
display
10. LED STATUS
You can determine the operating status by the lighting up and blinking of the LED display.
Check the status using the table below.
10. 1. Normal operation codes
Mode CODE DESCRIPTION
Operation
CL Cooling
Ht Heating
o r During oil recovery operation
d F During defrosting operation
P C During power saving operation
L n During low noise operation
10. 2. Error codes
Mode CODE DESCRIPTION
Communication
error
E 1 4. 2 Outdoor unit network communication 2 error
E 1 4. 5 The number of indoor unit shortage
Function setting er-
ror
E 2 2. 1 Indoor unit capacity error
E 2 4. 2 Connection unit number error (Indoor unit)
E 2 6. 1 Indoor unit duplicate address error
E 2 8. 1 Auto address setting error
E 2 8. 4 Signal amplifi er auto address error
Indoor unit
actuator error
E 5 U. 1 Indoor unit miscellaneous error
Outdoor unit PCB/
Electrical compo-
nent/ Switch error
E62.3Outdoor 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
E67.2
Outdoor unit inverter PCB power short interrup-
tion error
E68.2
Outdoor unit rush current limiting resister temp.
rise error (protective operation)
E69.1
Outdoor unit transmission PCB parallel communi-
cation error
Outdoor unit sen-
sor error
E 7 1. 1 Outdoor unit discharge temp. thermistor 1 error
E72.1
Outdoor unit compressor temp. thermistor 1 error
E73.3
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
E82.1
Outdoor unit sub-cool heat ex. gas inlet temp.
thermistor error
E82.2
Outdoor unit sub-cool heat ex. gas outlet temp.
thermistor error
E 8 3. 2 Outdoor unit liquid pipe temp. thermistor 2 error
E84.1
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
Outdoor unit
actuator error
E 9 3. 1 Outdoor unit inverter compressor start up error
E 9 4. 1 Outdoor unit trip detection
E95.5
Outdoor unit compressor motor loss of synchroni-
zation
E 9 7. 1 Outdoor unit fan motor 1 lock error
E 9 7. 4 Outdoor unit fan motor 1 undervoltage error
E97.5
Outdoor unit fan motor 1 temperature error
(protective action)
E98.1Outdoor unit fan motor 2 lock error
E98.5
Outdoor unit fan motor 2 temperature error
(protective action)
E 9 A. 1 Outdoor unit coil 1 (expansion valve 1) error
E 9 A. 2 Outdoor unit coil 2 (expansion valve 2) error
Refrigerant sys-
tem error
EA1.1
Outdoor unit discharge temperature 1 error (per-
manent stop)
EA3.1
Outdoor unit compressor 1 temperature error
E A 4. 1 Outdoor unit high pressure error
E A 4. 2 Outdoor unit high pressure protective action 1
E A 5. 1 Outdoor unit low pressure error
E A C. 4 Outdoor unit heat sink temperature error
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