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49

• 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

50

Note:
“O” - Frequency measured and fan speed fixed.

The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard
following by pressing the “CHECK” button at Remote Control.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error
Codes Table) by using Remote Control or Auto Switch at indoor unit. However, the Remote Control signal receiving sound is
changed from one “beep” to four “beep” sounds.

H00

No abnormality detected

—

Normal operation

—

H11

Indoor / outdoor abnormal 
communication

> 1 min after starting 
operation

Indoor fan operation 

only

• Internal / external cable connections
• Indoor / Outdoor PCB

H12

Connection capability rank abnormal

—

—

—

H14

Indoor intake air temperature sensor 
abnormality

Continue for 5 sec.

—

• Intake air temperature sensor 

(defective or disconnected)

H15

Outdoor compressor temperature sensor 
abnormality

Continue for 5 sec.

—

• Compressor temperature sensor 

(defective or disconnected)

H16

Outdoor Current Transformer open 
circuit

—

—

• Outdoor PCB
• IPM (Power transistor) module

H19

Indoor fan motor merchanism lock

—

—

• Indoor PCB
• Fan motor

H23

Indoor heat exchanger temperature 
sensor abnormality

Continue for 5 sec.

O

 (Cooling only)

• Heat exchanger temperature sensor 

(defective or disconnected)

H25

E-Ion breakdown

—

—

• Indoor PCB
• E-Ion PCB

H27

Outdoor air temperature sensor 
abnormality

Continue for 5 sec.

O

• Outdoor temperature sensor (defective 

or disconnected)

H28

Outdoor heat exchanger temperature 
sensor abnormality

Continue for 5 sec.

O

• Outdoor heat exchanger temperature 

sensor (defective or disconnected)

H30

Discharge temperature sensor 
abnormality

—

—

—

H33

Indoor/Outdoor wrong connection

—

—

• Indoor/Outdoor supply voltage

H38

Indoor/Outdoor mismatch

—

—

—

H58

Abnormal gas sensor

Continue for 6 hours

—

• Gas sensor                                    

(defective or disconnected)

H97

Outdoor Fan Motor lock abnormality

—

—

• Outdoor PCB
• Outdoor Fan Motor

H98

Indoor high pressure protection

—

—

• Air filter dirty
• Air circulation short circuit

H99

Indoor heat exchanger anti-freezing 
protection

—

—

• Insufficient refrigerant
• Air filter dirty

F11

Cooling / Heating cycle changeover 
abnormality

4 times occurance 
within 30 minutes

—

• 4-way  valve
• V-coil

F90

PFC control

4 times occurance 
within 10 minutes

—

• Voltage at PFC

F91

Refrigeration cycle abnormality

7 times occurance 
continuously

—

• No refrigerant

(3-way valve is closed)

F93

Outdoor compressor abnormal revolution

4 times occurance 
within 20 minutes

—

• Outdoor compressor

F95

Cool high pressure protection

4 times occurance 
within 20 minutes

—

• Outdoor refrigerant circuit

F96

IPM (power transistor) overheating 
protection

—

—

• Excess refrigerant
• Improper heat radiation
• IPM (Power transistor)

F97

Outdoor compressor overheating 
protection

4 times occurance 
within 20 minutes

—

• Insufficient refrigerant
• Compressor

F98

Total running current protection

3 times occurance 
within 20 minutes

—

• Excess refrigerant
• Improper heat radiation

F99

Outdoor Direct Current (DC) peak 
detection

7 times occurance 
continuously

—

• Outdoor PCB
• IPM (Power transistor)
• Compressor

51

• Lift to open the vertical vent gently. Remove the 3 caps and

3 screws at the bottom of discharge vent. (Fig. 1)

• Remove the Front Grille by releasing the 3 hooks at the top

of the Front Grille. Hold both sides of the Front Grille and
remove it by pulling up and towards you gently. (Fig. 1)

• Unhook the tabs at the Control Board to remove the Control

Board Cover. (Fig. 2)

• Release the Particular Piece. (Fig. 2)

Fig. 1

Fig. 2

• Release the 2 screws for the earth wire. (Fig. 3)
• Pull out 2 terminal wires (Red and Black) from the Terminal

Board. (Fig. 3)

• Detach the connector Indicator and release the Indicator.

(Fig. 3)

• Release the 2 Particular Piece. (Fig. 3)
• Release the screw Holder Terminal Board. (Fig. 3)
• Release the 2 connector E-Ion. (Fig. 3)

Fig. 3

High voltages are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding
with repair work. Failure to heed this caution may result in electric shocks.

52

• Release the hooks that hold the Main Electronic Controller

and pull out the Main Electronic Controller. (Fig. 4)

• Release the CN-DATA1 connector. (Fig. 5)
• Release the CN-TH connector. (Fig. 5)
• Release the CN-CLN connector. (Fig. 5)
• Release the CN-STM1 connector. (Fig. 5)
• Release the CN-STM2 connector. (Fig. 5)

Fig. 4

Fig. 5

• Release the hook that hold the Particular Piece and pull out

the Power Electronic Controller. (Fig. 6)

• Release the AC-303 connector. (Fig. 7)
• Release the CN-FM connector. (Fig. 7)

Fig. 6

Fig. 7