Toshiba RAV-M242A-E User manual

SERVICE MANUAL
ROOM AIR-CONDITIONER
FILE NO. A10–9801
PRINTED IN JAPAN, Mar.,1998 ToMo
SUPPLEMENT
Unit A
Unit B
RAS-13SK-E
(or RAS-13SKX)
RAV-M242A-E
(or RAV-M242A)
RAV-M242A-E
SPLIT WALL TYPE
(Combination with RAS-13SK-E)
RAV-M242A
(Combination with RAS-13SKX)

– 2 –
CONTENTS
1. SPECIFICATIONS..........................................................................................................................3
2. CONSTRUCTIONVIEWS ..............................................................................................................4
3. WIRING DIAGRAM ........................................................................................................................5
4. SPECIFICATIONS OF ELECTRICAL PARTS ...............................................................................6
5. REFRIGERANT PIPING DIAGRAM ..............................................................................................7
6. UNIT INSTALLATION.....................................................................................................................9
7. TROUBLESHOOTING CHART....................................................................................................10
7-1. What to be Prechecked First ......................................................................................................... 10
7-2. Primary Judgement ofTrouble Sources ....................................................................................... 11
7-3. Troubleshooting Flowcharts.......................................................................................................... 15
7-4. How to Check the Remote Control (Including the Indoor P.C. Board)........................................ 20
7-5. P.C. Board Layout ........................................................................................................................... 23
8. EXPLODEDVIEWS AND PARTS LIST .......................................................................................25
8-1. Indoor Unit ...................................................................................................................................... 25
8-2. Outdoor Unit ................................................................................................................................... 26

– 3 –
1. SPECIFICATIONS
RAV-M242A-E / RAV-M242A
2 indoor unit
AB
12, 200 x 2
6, 100
24, 400
7,1
1
220 – 240
50
2,46
99
10,8
68
53
R-22
0,95 + 0,95
Capillary tube
ø12,7 (1/2")
Flare
ø6,4 (1/4")
Flare
7,6 (25)
15 (48)
2 ( 7 )
5 (16)
5 (16)
RAS-13SK-E or RAS-13SKX
RAV-M242A-E or RAV-M242A
790 (2 – 7 1/8)
880 (2 – 9 1/8)
310 (1 – 1/4)
70 (154,3)
Finned tube
Propeller fan
63
PH160X2-4L
1,100
Fuse, inner overload-relay
Model
Item
Operation Unit
*1 BTU/h
kcal/h
Cooling capacity *1 BTU/h
kW
Phase
Power source V
Hz
Power consumption Cooling kW
Power factor Cooling %
Running current Cooling A
Starting current Cooling A
Operating noise (SPL*4) dB (A)
Refrigerant Name of refrigerant
Charge volume kg
Refrigerant control Gas side size mm (in.)
Coupler style
Liquid side size mm (in.)
Coupler style
Standard length m (ft)
Maximum length (One-way) *2 m (ft)
Minimum length m (ft)
Maximum height Indoor unit higher m (ft)
Outdoor unit higher m (ft)
INDOOR UNIT MODEL
OUTDOOR UNIT MODEL Height mm (ft-in.)
Dimensions Width mm (ft-in.)
Depth mm (ft-in.)
Net weight kg (Ibs)
Condenser type
Condenser fan type
Fan motor output W
Compressor Model
Output W
Protective device
Condenser air inlet temperature
35°C DB (95°F DB)
Evaporator air inlet temperature
27°C DB (80°F DB) 19,0°C WB (66°F WB)
Note 1: Cooling capacity is based on the following temperature conditions.
Note 2: These mean equivalent length.
Note 3: Operating range of the units
Note 4: SPL: Sound Pressure Level
Note 5: Specifications are subject to change without notice.
Remark:
• Be sure to refer to the service manual file No.A00-9701 for the indoor unit RAS-13SKX (or RAS-13SK-E) to be
connected.
Condenser air inlet temperature
43°C DB (109°F DB)
21°C DB (70°F DB)
Evaporator air inlet temperature
32°C DB, 22,5°C WB
(95°F DB, 73°FWB)
21°C DB, 15,5°C WB
(70°F DB, 60°FWB)
Maximum
Minimum

– 4 –
2. CONSTRUCTIONVIEWS
Outdoor Unit
RAV-M242A-E (or RAV-M242A)
340 1212
310
45
36
31
79045
50 Air inlet
Air outlet
880
257
70 57
34
Refrigerant piping joint
(Gas side 2-ø12,7)
Refrigerant piping joint
(Liquid side 2-ø6,4)
3486
Power supply cord hole
(ø19 knockout hole)
Inter-unit wiring cord hole
(
ø28 knockout hole
)
65 60
107 33
790
Air outlet
Electric parts box
Carrying handle
(Both side)
Electric parts cover
100
Outlet (Space for wiring
and piping)
100
Space required for service
Space for service
When installing, the inlet is
to be faced the wall side.
300
500
Anchor bolt hole
(4-12x18 long hole)

– 5 –
3. WIRING DIAGRAM
Shows terminal block and figures show terminal numbers.
Broken lines show wiring at site.
Don't operate the units with the magnetic contactor pushed.
Symbol Name
CM1, 2 Compressor
FMo Fan moter
RCc1, 2 Running capacitor (Compressor)
Symbol Name
RCo Running capacitor (Fan motor)
51C1, 2 Overload relay
52C1, 2 Magnetic contacto
11
L N
12
CM1
RCo1 RCo
WHI
BLK
BLK
RED
RED
51C1
52C1 52C2
220-240V 1Ph 50Hz
power supply Outdoor Unit
Earth screw
Indoor Unit
13
14
15
16
6
11
12
CM2
RCo2
WHI
BLK
BLK
RED
RED
51C2
13
14
A B
5 4 3 2 1
6 5 4 3 2 1
FMo
1 2 1
52C1 A B52C2
Unit A Unit B
2
1 2 1 2
A B
1 2 1
52C1 A B 52C2
Unit A Unit B
2
1 2 1 2
(Electrical Parts Box)
Parts Position
(Fan Motor, Compressor,Coil)
RCo
52C2
RCc2RCc1
52C1
NL2121
CM1
FMo
CM2
Outdoor Unit
Indoor Unit
A N
220-240V 1Ph 50Hz
power supply
Earth screw
RAV-M242A
RAV-M242A-E

– 6 –
4. SPECIFICATIONS OF ELECTRICAL PARTS
Parts name Type Specifications
Compressor 1, 2 PH160X2-4L Output 1,1 kW, 2 pole, 1 φ, 220 – 240V, 50 Hz
Winding resistance: Main coil 2,2 Ω, Aux. coil 3,8 Ω
Fan motor STF-200-63B Output 63 W, 6 pole, 1 φ, 220 – 240 V, 50 Hz
Magnetic contactor VC20FA AC 240V
Capacitor MT-40MP356W For compressor 1, 2, AC 400 V, 35 µF
EAG45M355UF1 For fan motor, AC 450 V, 3,5 µF

– 7 –
5. REFRIGERANT PIPING DIAGRAM
Evaporator
(Indoor unit A)
(RAS-13SK)
CYCLE 1
Condenser
Dryer Compressor 1
Accumulator
Refrigerant pipe
(Liquld side)
φ6,4mm
Packed
valve
Capillary tube
φ1,7 x 600
Packed
valve
Refrigerant pipe
(Gas side)
φ12,7mm Outdoor Unit
Capillary tube
φ0,6 x 600
Evaporator
(Indoor unit B)
(RAS-13SK)
CYCLE 2
Condenser
Dryer Compressor 2
Accumulator
Refrigerant pipe
(Liquld side)
φ6,4mm
Packed
valve
Capillary tube
φ1,7 x 600
Packed
valve
Refrigerant pipe
(Gas side)
φ12,7mm
Capillary tube
φ0,6 x 600

– 8 –
Model Connectable indoor Permissible piping Permissible piping Remarks
unit number length ( 1, 2) head (H)
RAS-13SK-E 2 15m 5m Fig. 5-1
(or RAS-13SKX)
5-1. Refrigerant Piping
5-1-1. Permissible Piping Length and Head
The minimum inter-unit refrigerant piping length shall
be 2m.
Limit the number of bends in the refrigerant piping to
10 or less.
Fig. 5-1
Table 5-1
5-1-2. Piping Material and Sizes
Table 5-2
Piping material
Phosphate deoxi-
dized copper
seamless pipes for
air conditioners
Model
RAS-
13SK-E
(or RAS-
13SKX)
Piping size (mm)
Larger Smaller
12,7 6,4
5-1-3. Air Purging
• Subject the refrigerant tube of outdoor and indoor
units to air purge with a vacuum pump.
•Do not carry out this air purge by using the refrig-
erant filled in the outdoor unit.
• To handle valves, a 5mm hexagon wrench is
needed.
5-1-4. Refrigerant Pipe Connecting Position
H
H
Unit A
2
1
RAS-13SK-E
(or RAS-13SKX) Unit B
RAS-13SK-E
(or RAS-13SKX)
Model Addition per meter
RAV-M242A-E No need
(or RAV-M242A)
Fig. 5-2
5-1-5. Additional Refrigerant Quantities
Table 5-3
Unit B
Unit A

– 9 –
6. UNIT INSTALLATION
Service Space
Ensure that there is sufficient space around the outdoor unit for installation and servicing.
Fig. 6-1
• Do not install in a place that can increase the vibration and amplify the noise level of the units.
• Be sure to fix the outdoor unit with four (4) M10 anchor bolts according to foundation drawings below.
45 45790
340
15
364
100 or more
500 or more
500 or more
300 or more
100 or more
500 or more
100
or more
Fig. 6-2

– 10 –
Description
TheOPERATION lamp blinks,indicating thatpower is turned
on. If this happens, press the START/STOP button once,
and blink will stop.
Power failure also causes the same lamp to blink.
The compressor will not start while the compressor restart
prevention timer (three-minute timer) is actuated.
This applies also when power is turned on.
Fan speed is fixed at Low in the dry operation.
The compressor will not stop while the compressor on-hold
timer (two-minute timer) is actuated.
In the dry operation, the compressor goes on and off at
regular intervals, independent of the thermostat control.
• Operations which are not DeemedTrouble
Table 7-1
Operation of air-conditioner
When the POWER plug of the indoor unit is
inserted, the OPERATION lamp blinks.
Room temperature is in the range under which
the compressor is turned on, but the compressor
will not start.
Fan speed remains unchanged when the fan
speed button is operated in the dry operation.
Room temperature is in the range under which
the compressor is turned off, but the compressor
will not stop.
The compressor will not switch on or off even
when the thermostat control is operated in the
dry operation.
7. TROUBLESHOOTING CHART
For RAS-13SK-E/RAV-M242A-E (or RAS-13SKX/RAV-M242A)
Troubleshooting Procedures :
• Following details of “What to be prechecked first”, make sure of the basic items.
• When there is no trouble corresponding to above, check in detail the faulty parts following “How to judge
faulty parts by symptoms” later.
7-1. What to be Prechecked First
7-1-1. Power SupplyVoltage
The power supply voltage must be from AC 198V to
264V. If the power voltage is not within this range,
the air conditioner may not work normally.
7-1-2. Incorrect Cable Connection between
Indoor and Outdoor Units
The indoor unit is connected to the outdoor unit with
three cables.
Make certain that the terminals of indoor and outdoor
connectors have been connected properly by the same
numbers.
If not connected as specified, the outdoor unit won’t
operate normally.
7-1-3. Operations not Regarded as Failure
(Program operation)
In terms of the control of air-conditioner, the opera-
tions shown in Table 7-1 are made as a program op-
eration incorporated in a microcomputer.
If a claim is made about the operation, check it corre-
sponds to the contents in the table.
If it does, it is an indispensable operation for the con-
trol and maintenance of the air-conditioner but not a
failure of the units.

– 11 –
Block display Check
code
OPERATION display blinking (1 Hz) —
OPERATION display blinking (5 Hz)
OPERATION display blinking (5 Hz)
OPERATION display blinking (5 Hz)
OPERATION display blinking (5 Hz)
OPERATION andTIMER display
blinking (5 Hz)
OPERATION,TIMER and FAN ONLY
display blinking (5 Hz)
OPERATION,TIMER and FAN ONLY
display blinking (5 Hz)
7-2. Primary Judgement ofTrouble Sources
7-2-1. Role of Indoor Unit Controller
The indoor unit controller receives the operation
commands from the remote control and assumes
the following functions.
• Measurement of the draft air temperature of the
indoor heat exchanger by using the temperature
sensor (TA).
• Louver motor control
• Control of the indoor fan motor operation
• Control of the LED display
• Control of the outdoor unit compressor and the
outdoor fan motor.
7-2-2. Display of Abnormalities and
Judgement of the Abnormal Spots
The indoor unit of this machine observes the opera-
tion condition of the air conditioner and displays the
contents of the self-diagnosis as block displays on
the display panel of the indoor unit.
System
No reaction on remote
control operation
The outdoor fan does
not rotate
Check
Turn off the power once, turn
it on again and try to operate
the remote control again.
The compressor operates.
The compressor does not operate.
Primary judgement
The indoor part (including the
remote control) is defective.
OK
The outdoor part is defective.
(outdoor fan motor)
The inside part is defective.
Remote control is
not possible.
Remote control is
possible.
(1) Judgement from defective operation or abnormal operation
Table 7-3
Self-diagnosis Check
code
Power failure (When power is on) —
Temperature sensor (TA) short/break
Heat exchanger sensor (TC) short/break
Indoor fan lock, abnormality of indoor fan, IC03,
D15 short/break
Indoor P.C. board failure
Thermal fuse is blown
(Indoor fan motor is overheat)
• Gas shortage, other refrigerant cycle trouble
• Heat exchanger sensor open/short/break
• Overload relay trouble
Compressor trouble
Table 7-2

– 12 –
(2) Self-diagnosis with remote control
With the indoor unit control, self-diagnosis of
protective circuit action can be done by turning the
remote control operation into service mode,
operating the remote control, observing the
remote control indicators and checking whether
OPERATION lamp blinks (5 Hz).
Note :
• To perform this self-diagnosis, the remote
control with the service code of 43069666
is required.
<How to select remote control operation mode>
1) Selecting service mode
Push the switch button provided on rear bot-
tom of the wireless remote control with a tip of
pencil for more than 3 seconds.
Make sure the setting temperature is
displayed on the display and other display is
turned off.
ACL CLOCK
(
Rear bottom of remote control
)
ACL CLOCK
All clear button
Switch for selecting
service mode
Rear bottom cover
2) Selecting ordinary mode
Push the all clear button (ACL) on the rear bot-
tom of the wireless remote control by a tip of
pencil for more than 3 seconds.
Make sure the operation mode display, wind
volume display, clock display and setting
temperature display are turned on and “ : ” of
the clock display is blinking.
<Cautions when doing service>
1) After completion of servicing, always push the
all clear (ACL) button to return the operation
mode to the normal mode.
2) After completion of servicing by the check
code, turn off the power once and then turn on
the power to reset memorized contents of the
microcomputer to the initial status.
Fig. 7-1
“ ”

– 13 –
3) The self-diagnosis by the check codes is con-
ducted with procedures shown below.
a) Enter the service mode and make sure the
off timer display of the remote control shows
.
b) Operate the “ON/OFF” key and make sure
the timer lamp on the display section is
blinking (5Hz).
c) At the same time, also make sure the OP-
ERATION lamp is also blinking.
This shows that the protection circuit on the
indoor P.C. board is working.
2) Remote control key operation under the ser-
vice mode is conducted by ON/OFF or TEMP.
The remote control display by each key op-
eration is varied as shown below.
Two digit number is displayed in a hexadeci-
mal number.
<Self-diagnosis by check codes>
1) The self-diagnosis by the check codes is con-
ducted under the block displays of item b)-e).
Indication after operation
1 is added to data before operation.
(Example)
1 is subtracted from data before operation.
(Example)
10 is subtracted from data before operation.
(Example)
Data before operation is directly transferred.
(Example)
Operating key
ON/OFF
TEMP. (Up)
TEMP. (Down)
“AUTO” LOUVER
“SET” LOUVER
Table 7-4
”
“
“ ”
d) Operate theTEMP. key and make sure
the remote control display shows and
blinking of the OPERATION lamp.
If the operation lamp is blinking, it shows
the protection circuits for connecting cable
is working or thermal fuse is blown.
e) In the same way, operate theTEMP. key
so that the display is increased one by one
to continue checks by the self-diagnosis
as shown in the next table.
From up to check operations
of protection circuits for each block, and
to check operations of the typi-
cal protection circuits.
“ ”
“ ”
“ ”
“ ” “ ”

– 14 –
Check
code
Diagnosis function
Table 7-5
Block level
Symptom
Thermo sensor
short/break
Heat exchanger
sensor short/break
Indoor fan lock,
abnormality of
indoor fan
Abnormality of
other indoor unit
P.C. board
Wrong wiring or
disconnection of
connective cable
• Thermal fuse cut
off
• Indoor fan lock,
abnormality of
indoor fan
• Gas shortage
(Gas leak)
• Other refrigerant
cycle trouble
• Heat exchanger
sensor off/break/
short
• Overload relay
break
Compressor break
down
Air
conditioner
status
Continued
operation
Continued
operation
All off
Continued
operation
All off
All off
All off
All off
Condition
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Block
Indoor
P.C. board
Cable
connection/
Thermal
fuse
Refrigerant
system
Judgment and action
• Check thermo sensor.
• If it is OK, check P.C.board.
(Around sensor circuit)
• Check heat exchanger
sensor.
• If it is OK, check P.C.board.
(Around sensor circuit)
• Check motor.
• Replace P.C. board, if the
same failure occurs, after
the motor check.
Replace P.C. board.
• Check flat cable correct if
wiring is wrong.
• If it is OK, check P.C. board.
• Check thermal fuse.
• If it is OK, check motor.
• If motor is OK, check P.C.
board.
• Check gas quantity.
(Check gas leakage)
• If it is OK, check heat
exchanger sensor.
• If heat exchanger sensor is
OK, check overload relay.
• If overload relay is OK,
check refrigerant cycle.
• If refrigerant cycle is OK,
check P.C. board.
• Check compressor.
• If it is OK, check P.C. board.
Check
code

– 15 –
P.C. board
is defective.
Symptom
Operation
Check Items
Main cause
Countermeasure
Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.
Does the OPERATION
lamp blink?
Does the transmission
indicator of remote
control blink normally and
transmit certainly?
Remote control
is defective.
Replace the
remote control.
(No problem)
Does the fuse
(F01) blow?
Replace the main
P.C. board.
Wrong wiring of
AC cord or connecting
cable is defective.
Replace the
thermal fuse set.
Check connection.
Is the indication voltage
(DC12V or 5V) of main
P.C. board correct?
Is the voltage
across C02 measured
DC310V~340V?
Refer to the paragraph
"Pre-check", or defective circuit
before power P.C. board block.
Shut off the power
supply once, and turn
it on again after dis-
connecting the motor
connector CN10
*
.
Is the secondary
voltage of SW
transformer measured
DC35V, DC12V,
and DC7V?
Motor is defective.
Is the secondary
voltage of SW trans-
former (T01) measured
DC35V, DC12V,
and DC7V ?
YES
SW transformer
(T01) or IC (IC01)
for power supply
is defective.
Parts (R21, R109, SG01,
C15, C01, DB01, C02,
IC01, T01) are defective.
Does the power turn
on by pushing the
[START/STOP] button
of the remote control?
NO
YES
YES
NONO
YES
YES
NO
NO
NO
YES
YES
NO
YES
YES
NO
Does the thermal
fuse blow?
(Under PF. Terminal)
NO
Replace the main
P.C. board.
7-3. Troubleshooting Flowcharts
7-3-1. Power can not beTurned on (No Operation at All)
<Preliminary checks>
(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK?
*Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of
damage of the motor.

– 16 –
RY01
C02
RY02
Brown
N L
Power
terminal
block T02
P.C. board
Blue
White
Black
1 2
Indoor
terminal
block
To the paragraph of
No Power turns on .
Does the OPERATION
lamp blink?
YES
NO
Connect the AC
Power supply
Return the wiring of the
power relay is returned to
the normal procedure.
Is it wired as shown
in Figure below?
YES
NO
Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.
Does the OPERATION lamp blink?
Does the power turn on by
pushing the [START/STOP] button
of the remote control?
Is cable connection
between indoor and outdoor
units correct?
Check items as following procedure
in 7-3-4, 7-3-5, 7-3-6.
Replace the
P.C. board.
See "Power can not be turned on".
Relays (RY01, RY02)
or IC31 or IC30 is failure.
Correct cabling between
indoor and outdoor units.
NO
NO
NO
NO
YES
YES
YES
YES
See "Power can not be turned on".
Is AC220/230/240V
supplied between terminal block
1 - 2 ?
7-3-2. Power can not beTurned on after Replacing Indoor P.C. Board
<Checking Procedure>
7-3-3. Outdoor Unit does not Operate

– 17 –
Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.
Does the OPERATION lamp blink?
Does the power turn on by
pushing the [START/STOP] button
of the remote control?
Is cable connection between indoor
and outdoor units correct?
Replace the
P.C. board.
See "Power can not be turned on".
NO
NO
NO
NO
YES
YES
YES
YES
Is the voltage across the outdoor terminal
( 1 - 2 ) 220/230/240 VAC?
YES
Are all the cords for compressor normal?
Is the compressor motor winding normal?
(Check the winding resistor.)
Is the capacitor for compressor normal?
Is the overload relay normal?
Does the compressor start?
Compressor starts but
it stops after a while?
Cables between indoor and
outdoor units are defective.
Re-wire or replace the defective cords.
Compressor is defective.
Capacitor is defective.
Overload relay is defective.
Compressor is defective.
Correct cabling between indoor
and outdoor units.
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
See "Power can not be turned on".
YES
Is the gas quantity normal?
(Check the pressure) Gas shortage (Gas leakage)
NO
Compressor is defective
Is the voltage across the indoor terminal
( 1 - 2 ) 220/230/240 VAC? Relays (RY01, RY02)
or IC31 or IC30 is failure.
7-3-4. Only Compressor does not Operate

– 18 –
Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.
Does the OPERATION lamp blink?
Does the power turn on by
pushing the [START/STOP] button
of the remote control?
Is cable connection between indoor
and outdoor units correct?
Replace the
P.C. board.
See "Power can not be turned on".
NO
NO
NO
NO
YES
YES
YES
YES
Is the outdoor fan motor winding normal?
(Check the winding resistance)
Is the capacitor for compressor normal?
Outdoor fan motor is defective.
Cables between indoor and
outdoor units are defective.
Outdoor fan motor is defective.
Correct cabling between indoor
and outdoor units.
NO
NO
NO
NO
YES
YES
YES
YES
Are all the cords for outdoor
fan motor normal? Correct the wire or
replace the defective cords.
Capacitor for outdoor
fan motor is defective.
See "Power can not be turned on".
Relays (RY01, RY02)
or IC31 or IC30 is failure.
Is the voltage across the indoor terminal
( 1 - 2 ) 220/230/240 VAC?
Is the voltage across the outdoor terminal
( 1 - 2 ) 220/230/240 VAC?
7-3-5. Only Outdoor Fan does not Operate

– 19 –
YES
NO
Replace the
P.C. board.
Shut off the power
supply once.
Does the fan
stop in no operating
status? Control P.C. board is defective. Replace the P.C. board.
Start the operation
with low fan setting
in cool operation.
Does the fan rotate?
Change the setting of
cooling to high fan.
Does the fan speed
become higher? Operation
stops
Normal
Is the voltage
measured DC35V
between
1 (red lead wire, +)
and
2 (black lead wire, –)
of the motor connector
(CN10) ?
Shut off the power supply.
Does the cross
flow fan rotate
normally?
Repair the
bearing of
the drain fan.
Turn on the power supply.
Is the rotation signal
(DC+5V-0V) output between
4
(blue lead wire) and
2 (black
lead wire) of the motor connector
(CN10) when rotating the cross
flow fan by hand in no operating
status ? (two pulses/one turn)
Replace the control
P.C. board.
Shut off the power supply,
and turn it on after
disconnecting the motor
connector (CN10)
*
from
the P.C. board.
Is the voltage of
DC35V measured
between 1 (red lead wire, +)
and 2 (black lead wire, –) of
the motor connector
(CN10) ?
Replace the
fan motor.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Turn the power supply.
7-3-6. Only the Indoor Fan does not Operate
< Check procedure >
*Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of
damage of the motor.

– 20 –
NO
YES
After battery replacement,
shortcircuit the metal terminal at
the side of the battery compartment
(all-clear terminal) with a pencil.
Push the START/STOP button.
Does the transmission
indicator blink?
There is no beep from
the indoor unit.
The operation lamp of
the air conditioner main
unit does not light.
Is there direct
sunlight on the
receptor of the
air conditioner?
Avoid direct
sunlight.
Is there any
thyristor
fluorescent light
near by?
Keep the air
conditioner away
from thyristor
fluorescent light.
Is operation
possible when the
transmitter is moved
nearer to the infrared
signal receiver of the
air conditioner?
Battery life
Can any signal tone
be heard in a transistor
radio when transmitting
within 5cm distance
from the radio?
Does the
transmission
indicator light?
Is there any
beep and
operation?
Short-circuit the metal
terminal at the side of the
battery compartment
(all-clear terminal) with a pencil.
(wait about 10 seconds)
P.C. Board is failure.
Replace
P.C. board. Replace the
batteries Normal
Remote control
is failure.
Replace remote
control.
Note:
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Is operation
possible when setting
the temporary switch of the
air conditioner main unit to
"TEST RUN" or
"TEMPORARY AUTO"?
Push the START/
STOP button
7-4. How to Check the Remote Control (Including the Indoor P.C. Board)