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—18—

In general, possible trouble is classified in two causes.
The one is called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.

Check of outdoor coil
(heat exchanger) & the fan
operation

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING :   7~10

°

C

HEATING  : 15~17

°

C

Check heat load increase in
cooling operation.

Unexpected residue

Added heat load

Check of inside gas
pressure

Adjusting of refrigerant
charge

Malfunction of compressor

Replacement of
compressor

Check of cold (warm) air cir-
culation for smooth flowing

Dirty indoor coil
(Heat exchanger)

Malfunction of fan

Clogged of air filter

Obstruction at air outlet

Countermeasure against
above trouble.

Check clogging in refrigera-
tion circuit.

Repair clogging in refrigera-
tion circuit.

—19—

Check of circuit breaker
and fuse

Gas leakage of feeler bulb
of thermostat

Check of control switch

Only fan fails to start.

Improper wiring

Defect of fan motor
capacitor

Irregular motor resistance
(      )
Irregular motor insulation
(      )

Replacement of fan motor

Regular but fails to start.

Replacement of compressor
(locking of rotor, metal)

Improper thermostat setting

Loose terminal connection.

Improper wiring

Irregular motor resistance (    )

Irregular motor insulation (    )

Replacement of compressor
(Motor damaged)

Drop of power voltage

Capacitor check

Replacement

Only compressor fails to
start.

Defect of compressor
capacitor

Check of power source

Check of control switch
setting

—20—

The unit does not operate.

Is the Trans input power

AC 220V/240V?

Is the Trans output power

about AC 13V?

Is shorted the Trans. output?

Is output Voltage of IC01D

DC 12V?

Is output Voltage of IC02D

DC 5V?

Is the voltage No.20 of Micom

DC 5V?

Exchange Main PCB Ass'y.

Is the 

connection between

Main and Display 

all right?

Is the reset circuit all right?

(The No.16 of Micom is 5V.)

• Check the Fuse.
• Check the wiring diagram.

• Check the Main 
  PCB pattern.

• Exchange the Trans.

• Exchange D02D~D05D.
• Exchange IC01D.

• Exchange IC02D.

• Exchange IC01A.

• Connect connector
  exactly.

• Check the PCB 
  pattern.

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

YES

—21—

The compressor does not operate.

The compressor always operate.

Is setting 

Temp. set lower  than Room 

Temp.-0.5

°

C?

Is the voltage No.11

of IC01M 0V?

• Exchange IC01M.

• Select the setting Temp. to lower Number.

• Wait 3 Minutes.

Is the Unit for 3 minutes

delay?

• Exchange MAIN 
  PCB Ass'y.

Is the voltage N0.6 of 

IC01M DC 5V?

• Check the RY-COMP.

• Check the wiring 
  Diagram.

NO

NO

NO

YES

YES

YES

YES

Is the wire connection of 

RY-COMP all right?

• Check the RY-COMP.

• Connect LEAD Wire to 
  RY-COMP again.

NO

YES

NO