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1. Check temperature difference between intake and discharge air and operating current.

Temp. Difference

Temp. difference

: approx. 0°C

Current

: less than 80% of

rated current

Temp. difference

: approx. 8°C

Current

: less than 80% of

rated current

Temp. difference

: less than 8°C

Current

: over the rated

current

Temp. difference

: over 8°C

Operating Current

All amount of refrigerant leaked out
Check refrigeration cycle

Refrigerant leakege
Clog of refrigeration cycle
Defective compressor

Excessive amount of refrigerant

Normal

Notice :
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.

2. Check temperature and pressure of refrigeration cycle.

Notice :
1. The suction pressure is usually 4.5~6.0 kg/cm

2

G at normal condition.

2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with

putty.

Suction pressure

Temperature

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal value)

Defective compressor

Current is low

Defective 4-way reverse valve

Excessive amount of

High pressure does not quickly

Normal

refrigerant

rise at the beginning of
operation

Insufficient amount of

Current is low

Lower

Higher

refrigerant (Leakage)
Clogging

Current is low

High

Higher

–38–

1. Check temperature difference between intake and discharge air and operating current.

Temp. Difference

Temp. difference

: approx. 0°C

Current

: less than 80% of

rated current

Temp. difference

: approx. 8°C

Current

: less than 80% of

rated current

Temp. difference

: less than 8°C

Current

: over the rated

current

Temp. difference

: over 8°C

Operating Current

All amount of refrigerant leaked out
Check refrigeration cycle

Refrigerant leakege
Clog of refrigeration cycle
Defective compressor

Excessive amount of refrigerant

Normal

Notice :
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.

2. Check temperature and pressure of refrigeration cycle.

Notice :
1. The suction pressure is usually 4.5~6.0 kg/cm

2

G at normal condition.

2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with

putty.

Suction pressure

Temperature

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal value)

Defective compressor

Current is low

Defective 4-way reverse valve

Excessive amount of

High pressure does not quickly

Normal

refrigerant

rise at the beginning of
operation

Insufficient amount of

Current is low

Lower

Higher

refrigerant (Leakage)
Clogging

Current is low

High

Higher

–38–

: The unit does not operate.

–39–

YES

YES

YES

NO

YES

Is the input voltage

of transformer AC220V?

Is the input voltage

of IC01D DC14V?

Check the FUSE
and the wiring diagram.

Is the output voltage 

of IC01D DC12V?

Is the PIN 55,64 of

MICOM. DC5V?

Exchange MICOM

YES

NO

Check the main P.C.B
pattern

NO

NO

Check the D02D~D05D

NO

YES

Exchange 
the transformer

Is shorted the

transformer output?

NO

YES

Is the output voltage 

of IC03D DC5V?

NO

Exchange IC01D

Exchange IC03D

Is the output voltage

of transformer about AC14V?

Check the 
5V P.C.B pattern.

: The indoor fan does not operate.

NO

Is IC03M operated

normally?

Check the fan motor
and connector.
(CN-MOTOR)

YES

Is the each Relay

any problem?

NO

YES

Exchange IC03M

Exchange Relay

–40–

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

Reset the power

ON/OFF S/W ON

Is the AC220V

(AC 240 V) between connector

(CN-outunit)

and

of Main

P.C.B

Is the input power AC220V

(AC240V) at COMP magnetic coil

contactor?

Is it heating mode?

Room temp <Set temp?

Is the DC5V

at 14 pin of terminal MICOM

Is the DC5V

at 18 pin of terminal MICOM

Is the DC12V

at each terminal?

(RY-4WAY COIL)

Is the

AC220V (AC 240 V) between

connector(4WAY) and CN-outunit of

Main
P.C.B

Is the DC12V at

each terminal? (RY-COMP

COIL)

Replacement RY-4WAY

Replacement IC02M

Replacement RY-COMP

Is the AC220V

(AC 240 V) between connector(CN-outunit)

and of Main

P.C.B

Check the wiring diagram.

Replacement MICOM

Replacement IC02M

Room temp. < Set temp. Setting

Replacement MICOM

Select the heating operation mode.

Check the COMP magnetic
contactor of outdoor unit.

Check the wiring

connection

Is the unit operating?