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53

• To check current remote control transmission code

- Press for more than 10 seconds.

• To change the air quality sensor sensitivity

- Press and release with pointer.
- Press the Timer Decrement button to select sensitivity:

1. Low Sensitivity
2. Standard (Default)
3. Hi Sensitivity

- Confirm setting by pressing Timer Set button, a “Beep” sound will be heard. LCD returns to original display after 2 seconds.
- LCD returns to original display if remote control does not operate for 30 seconds.

• To change the remote control’s time format

- Press for more than 5 seconds.

• To clear and restore the remote control setting to factory default

- Press once to clear the memory.

• To restore the unit’s setting to factory default

- Press once to restore the unit’s setting.

• To change indoor unit indicator’s LED intensity

- Press continuously for 5 seconds.

• To change remote control display from Degree Celsius to Degree Fahrenheit.

- Press continuously for 10 seconds.

Remote Control Printed Circuit Board

Jumper A (J-A)

Jumper B (J-B)

Remote Control No.

Short

Open

A (Default)

Open

Open

B

Short

Short

C

Open

Short

D

54

In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right.

55

• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.

Cooling Mode

Heating Mode

Condition of the

air conditoner

Low Pressure

High Pressure

Electric current 

during operation

Low Pressure

High Pressure

Electric current 

during operation

Insufficient refrigerant

(gas leakage)

Clogged capillary tube or 

Strainer

Short circuit in the indoor 

unit

Heat radiation deficiency of

the outdoor unit

Inefficient compression

56

• Once abnormality has occurred during operation, the unit

will stop its operation, and Timer LEDs blink.

• Although Timer LED goes off when power supply is turned

off, if the unit is operated under a breakdown condition, the
LED will light up again.

• In operation after breakdown repair, the Timer LED will no

more blink. The last error code (abnormality) will be stored in
IC memory.

• To make a diagnosis

1. Timer LED start to blink and the unit automatically

stops the operation.

2. Press the CHECK button on the remote controller

continuously for 5 seconds.

3. “- -” will be displayed on the remote controller display.

Note: Display only for “- -”. (No transmitting signal, no
receiving sound and no Power LED blinking.)

4. Press the “TIMER” 

 or 

 button on the remote

controller. The code “H00” (no abnormality) will be
displayed and signal will be transmitted to the main
unit.

5. Every press of the button (up or down) will increase

abnormality numbers and transmit abnormality code
signal to the main unit.

6. When the latest abnormality code on the main unit

and code transmitted from the remote controller are
matched, power LED will light up for 30 seconds and
a beep sound (continuously for 4 seconds) will be
heard. If no codes are matched, power LED will light
up for 0.5 seconds and no sound will be heard.

7. The breakdown diagnosis mode will be canceled by

pressing the CHECK button continuously for 5
seconds or without any operation the remote control
for 30 seconds.

8. The LED will be off if the unit is turned off or the AC

button on the main unit is pressed.

• To display memorized error (Protective operation)

1. Turn power on.
2. Press the CHECK button on the remote controller

continuously for 5 seconds.

3. “- -” will be displayed on the remote controller display.

Note: Display only for “- -”. (No transmitting signal, no
receiving sound and no Power LED blinking.)

4. Press the “TIMER” 

 or 

 button on the remote

controller. The code “H00” (no abnormality) will be
displayed and signal will be transmitted to the main
unit. The power LED lights up. If no abnormality is
stored in the memory, three beeps sound will be
heard.

5. Every press of the button (up or down) will increase

abnormality numbers and transmit abnormality code
signal to the main unit.

6. When the latest abnormality code on the main unit

and code transmitted from the remote controller are
matched, power LED will light up for 30 seconds and
a beep sound (continuously for 4 seconds) will be
heard. If no codes are matched, power LED will light
up for 0.5 seconds and no sound will be heard.

7. The breakdown diagnosis mode will be canceled

unless pressing the CHECK button continuously for 5
seconds or operating the unit for 30 seconds.

8. The same diagnosis can be repeated by turning

power on again.

• To clear memorized error (Protective operation) status

1. Turn power on.
2. Press the AUTO button for 5 seconds (A beep

receiving sound) on the main unit to operate the unit
at Forced Cooling Operation mode.

3. Press the CHECK button on the remote controller for

about 1 second with a pointed object to transmit
signal to main unit. A beep sound is heard from main
unit and the data is cleared.

• Temporary Operation (Depending on breakdown status)

1. Press the AUTO button (A beep receiving sound) on

the main unit to operate the unit. (Remote control will
become possible.)

2. The unit can temporarily be used until repaired.

Error Code

Operation

Temporary items

H23

Cooling

Emergency Operation with limited
power

H27, H28

Cooling, Heating