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—26—

Test capacitor.

Check the terminals. If loose, repair or replace.

Check the system for a restriction.

If restricted, clean of replace.

Close if open.

Determine if the unit is properly sized for the area to

be cooled.

Check the set screw or clamp. If loose or missing,

correct. If the blower or fan is hitting air guide,

rearrange the air handling parts.

Remove the cabinet and carefully rearrange tubing

not to contact cabinet, compressor, shroud, and

barrier.

Set the knob to COOL (      ) or HEAT (      ) while

rocker switch is ON.

Check terminals. If loose, repair or replace.

Check the synchronous motor for open circuit.

Check the voltage at outlet. If none, correct.

Check the teminals. If loose, repair or replace.

Check for continuity, refer to the wiring diagram for

teminal identification. Replace the switch if the

circuit is open.

Check setting. Turn to warmest position.

Check the position of knob. If not at the warmest

setting, advance knob to this setting. Check conti-

nuity of the thermostat. Check continuity of control

by removing lead from terminal, turn the

selector switch to heat, and check between com-

mon terminal and H terminal. (NOTE: Room tem-

perature should be 30°C(86°F) or lower when test-

ing the temperature control.) If no continuity

exists, replace thermostat.

Selecter switch must be in the HEAT (      ) mode.

Check continuity of the switch. Continuity should

be between terminals identified on wiring diagram

when the switch is in heat mode.

Check continuity of the reverse valve coil.

Continuity should be between two lead wires.

If none, check the reverse valve body.

Replace the part which is defective.

Capacitor

Wiring

Refrigerating system

Air filter

Exhaust damper door

Unit undersized

Blower or fan

Copper tubing

Rotary switch.

Wiring

Synchronous motor.

No power

Wiring

Rotary switch

Temperature control position

Thermostat

(Temperature control)

Selector switch position

Selector switch

Reverse valve

Compressor cycles on

overload

Insufficient cooling or

heating

Excessive noise.

Auto air-swing fails.

No heat.

—17—

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.

—18—

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.

 Check capacitor.

Replacement.

Only compressor fails to
start.

Defect of compressor
capacitor.

Check of power source.

Check of control switch
setting.

—19—

The unit does not operate.

• Check the Fuse.
• Check the wiring diagram.

Is the Trans output power

AC 220V?

Is the Trans output power

about AC 14V?

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, C02A.

• Connect connector
  exactly.

• Check the PCB 
  pattern.

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

YES