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– 65 –

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

Is the heating operating?

Is the Compressor 

operating?

Is the Heat S/W of Main

PCB "ON"?

Heat S/W "ON"

Replacement MICOM

Replacement ICO2M

Replacement RY-Heater

Is the DC 5V at 15 pin of

MICOM

Is the 

DC 12V at eack terminal? 

(RY-Heater COIL)

Is the

AC220V (AC 240 V) between

connector(HEATER) and CN-outunit Pin 1

of Main P.C.B

Check the heater wiring

Select the heating operation mode.

Compressor "ON"

– 52 –

Check of circuit breaker
and fuse.

Check control switch.

Fan only fails to start

Improper wiring

Defect of fan motor
capacitor.

Irregular motor 
resistance 

( 

Ω

 )

Irregular motor 
insulation 

( 

Ω

 )

Replacement of fan motor.

Improper electric heater

Replacement of electric 
heater

Regular but fails to start.

Replacement of compressor

Electric heater is not energized

Loose terminal connection.

Improper wiring

Irregular motor resistance 

( 

Ω

 )

Irregular motor insulation 

( 

Ω

 )

Replacement of compressor

Drop of power voltage

Capacitor check

Replacement

Compressor only fails to
 start

Defect of compressor
capacitor

Check power source.

Check control switch
setting.

– 53 –

NAME PLATE RATING

MINIMUM

MAXIMUM

380 V

342 V

418 V

220 V

198 V

242 V

380 - 415 V

342 V

456 V

Other parts than the unit

Magnetic switch for com-
pressor & fan motor 

Operating switch

Protection devices

Electric supply interrupted
Defective power wiring
Cut of power fuse

Too low voltage

Control point is on condi-
tion of "OFF" due to trou-
ble.

Troubled or defective
contactor

Opened the contact point
with trouble

Measure it with a tester in
case that the same
power source is supplied
to other equipment than
the unit, what and where
trouble can be discov-
ered by checking the
operation of other equip-
ment.

Measure it with a tester.

Make short-circuit, then
measure it with a tester. 

Check it with the eyes or
tester.

Check it with the eyes or
tester.

Repair a switch box and
is relative instrument.

Replacement of fuse

Request a power 
supplier to repair.

Check the power source.
Use a thick cable if nec-
essary.

Replace it if necessary.

Repair or replace it.

Discover the trouble
cause and push the rest
button.

Air volume change over
switch

Capacitor

Troubled or defective 
contact point

Defected

Check it with the eyes or a
tester

Check it with a tester.

Repair or replace it.

Replace it.

– 54 –

Motor

Electric Wiring

Over-heated
Layer short

Open wire on operation

Short circuited on 
operation

Check how it is insulated.

Check it with a tester.

Repair or replace it.

Rewiring or repair.

Magnetic switch for
compressor motor

Compressor motor

Compressor

High pressure switch

Electric circuit

Defective contact, 
magnetic coil troubled.

Troubled over-heated 
(layer short)

Troubled or over-heated 
(lock)

Troubled or defective 
contact or operating

Defective connection or
disconnection of the circuit
for compressor.

Check it with the eyes on
with a tester.

Check how it is insulated.

Groaned noise of motor

Check it with a tester.

Check it with a tester.

Repair or replace it.

Replace or repair the
compressor.

Repair or replace it.

Replace it if necessary.

Rewiring or push reset
button.