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Even after stopping the operation of product, it takes some time to discharge the remaining electricity of the
electrolytic capacitor that was charged. Before starting a checking or repairing job, pull out the plug out of the
outlet and make sure that the lamp on the control board outdoor unit is off.

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Check the supplied voltage to product (AC 220V/240V ± 30V).

Check the connecting cable between Indoor and Outdoor.

Check the blinking number of operation indicator (refer to the self-error function).

Check the self-diagnosis table

• Check the condition of connectors
• The condition of P.C.B pattern.

• Check the condition of connectors.
• The condition of P.C.B pattern.
• The electronic components.

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Refer to electronic contorol device drawing & schematic diagram.

Turn off the main power and wait to 5 seconds

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?

• Primarily, the operating

condition of Micom is O.K.

• Check CN-DISP1

CN-DISP2

Check the voltage of power(AC220V/AC240V, 50Hz).

• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, Bridge Diode, etc.)

NO

YES

The operation check of the P.C.B. Ass'y

1) The input voltage of power

transformer.

2) The output voltage of power

transformer.

3) IC01D(7812)

4) IC02D(7805)

5) IC01A(KIA7036)

1) AC230V ± 30V

: Check the rated voltage

2) 14V ± 3V

3) DC12V

4) DC5V

5) The voltage of micom pin 29 

: DC4.5V

↑

1) Replace 

power transfomer.

2) Replace 

power transfomer.

3) Replace IC01D.

4) Replace IC02D.

5) Replace IC01A.

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OPEN

OPEN

OPEN

OPEN

OPEN

OPEN/SHORT

OPEN

• Malfunctions all indoor & outdoor unit.
• Malfunctions remocon, force, test operation mode.

• Malfunctions outdoor unit.
• Stop compressor and outdoor fan motor.
• The operation LED blinks 5 times.
• Communicaion error.

• Malfunctions remote contoller.
• Don't operate the power display module.

• Don't operate the power display module.

• The operation LED blinks twice.
• Enable to receive remote singnal.

• Malfunctions UP/DOWN step motor.
• Don't operate louver.

• Malfunctions indoor fan motor.

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OPEN

OPEN

OPEN

OPEN

• Stop compressor.

• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.

• Malfunctions PFC & inverter circuit.
• Stop compressor and outdoor fan.

• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.

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OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN/SHORT

OPEN/SHORT

OPEN/SHORT

• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.

• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.

• Malfunctions PFC & inverter circuit.
• Stop compressor and outdoor fan.

• Malfunctions EMI /EMS

• Malfunctions Sump Heater

• Malfunctions 4-WAY valve.

• Malfunctions fan.

• Malfunctions Comp. Motor.
• The operation LED blinks 4 times.
• The LED01K blinks 4 times.

• The operation LED blinks twice.
• The LED01K blinks twice.

• The LED01K blinks 10 times.
• Continue Comp. operation.

(when the discharge pipe TH opens)

• Stop Comp. operation

(when the discharge pipe TH shorts)

• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.