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45

• 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 conditioner

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

46

• Once abnormality has occurred during operation, the unit

will stop its operation, and Timer LED blinks.

• 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

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

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

RESET 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 (in standby condition).
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

H26

Cooling, Heating

Emergency Operation without
power limit

47

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 start-
ing operation

Indoor fan

operation only

• Internal / external cable connections
• Indoor / Outdoor PCB

H12

Connection capability rank abnormal

—

—

—

H14

Indoor intake air temperature sensor abnor-
mality

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

H21

Indoor float switch operation abnormal

—

—

—

H23

Indoor heat exchanger temperature sensor 1 
abnormality

Continue for 5 sec.

O

 (Cooling only)

• Heat exchanger temperature sensor 

1 (defective or disconnected)

H24

Indoor heat exchanger temperature sensor 2 
abnormality

Continue for 5 sec.

—

• Heat exchanger temperature sensor 

2 (defective or disconnected)

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

Continue for 5 sec.

—

• Discharge temperature sensor

H33

Indoor/Outdoor wrong connection

—

—

• Indoor/Outdoor supply voltage

H35

Indoor drain water adverse current abnormal

—

—

—

H38

Indoor/Outdoor mismatch

—

—

—

H97

Outdoor Fan Motor lock abnormality

2 times occurrence 
within 30 minutes

—

• 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 occurrence 
within 30 minutes

—

• 4-way valve
• V-coil

F90

PFC control

4 times occurrence 
within 10 minutes

—

• Voltage at PFC

F91

Refrigeration cycle abnormality

2 times occurrence 
within 20 minutes

—

• No refrigerant

(3-way valve is closed)

F93

Outdoor compressor abnormal revolution

4 times occurrence 
within 20 minutes

—

• Outdoor compressor

F95

Cool high pressure protection

4 times occurrence 
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 occurrence 
within 20 minutes

—

• Insufficient refrigerant
• Compressor

F98

Total running current protection

3 times occurrence 
within 20 minutes

—

• Excess refrigerant
• Improper heat radiation

F99

Outdoor Direct Current (DC) peak detection

7 times occurrence 
continuously

—

• Outdoor PCB
• IPM (Power transistor)
• Compressor

48

• During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is

checked whether it is normal.

• Faulty indoor unit PCB.
• Faulty outdoor unit PCB.
• Indoor unit-outdoor unit signal transmission error due to wrong wiring.
• Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between the indoor and outdoor

units.

• Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform.