Samsung AQ12A5(6)MB User manual

SERVICE
Manual
INDOOR UNIT
AQ12A5(6)MB
AQ12A5(6)ME
AQ09A5(6)ME
SH09ZA5(6)
AQ07A5(6)ME
SH07ZA5(6)
AQ09A7(8)ME
SH09ZA7(8)
AQ07A7(8)ME
SH07ZA7(8)
OUTDOOR UNIT
UQ12A5(6)MB
UQ12A5(6)ME
UQ09A5(6)ME
SH09ZA5(6)X
UQ07A5(6)ME
SH07ZA5(6)X
UQ09A7(8)ME
SH09ZA7(8)X
UQ07A7(8)ME
SH07ZA7(8)X
CONTENTSAIR CONDITIONER
1. Precautions
2. Product Specifications
3. Operating Instructions and
Installation
4. Disassembly and Reassembly
5. Troubleshooting
6. Exploded Views and Parts List
7. Block Diagrams
8. PCB Diagrams
9. Wiring Diagrams
10. Schematic Diagrams
ROOM AIR CONDITIONER
00181-COVER-1 11/6/00 5:04 PM Page 1-1

ELECTRONICS
© Samsung Electronics Co., Ltd. Sep. 2000.
Printed in Korea.
Code No. DB81-00181A(2)
00181-COVER-1 11/6/00 5:04 PM Page 1-2

1. Warning: Prior to repair, disconnect the
power cord from the circuit breaker.
2. Use proper parts: Use only exact replace-
ment parts. (Also, we recommend replacing
parts rather than repairing them.)
3. Use the proper tools: Use the proper tools
and test equipment, and know how to use
them. Using defective tools or test equip-
ment may cause problems later-intermittent
contact, for example.
4. Power Cord: Prior to repair, check the
power cord and replace it if necessary.
5. Avoid using an extension cord, and avoid
tapping into a power cord. This practice
may result in malfunction or fire.
6. After completing repairs and reassembly,
check the insulation resistance. Procedure:
Prior to applying power, measure the resis-
tance between the power cord and the
ground terminal. The resistance must be
greater than 30 megohms.
7. Make sure that the grounds are adequate.
8. Make sure that the installation conditions
are satisfactory. Relocate the unit if neces-
sary.
9. Keep children away from the unit while it is
being repaired.
10. Be sure to clean the unit and its surround-
ing area.
Samsung Electronics 1-1
1. Precautions
Fig. 1-1 Avoid Dangerous Contact
Fig. 1-2 No Tapping and No Extension Cords
Fig. 1-3 No Kids Nearby!
O.K
Fig. 1-4 Clean the Unit
00181-PRECA-2 11/6/00 5:12 PM Page 1-1

1-2 Samsung Electronics
MEMO
00181-PRECA-2 11/6/00 5:12 PM Page 1-2

Samsung Electronics 2-1
2. Product Specifications
2-1 Table
Model
Item
Type -
Cooling BTU/h(KW)
Heating BTU/h(KW)
Dehumiditying I/h
Air volume Cooling m3/min
Heating
Noise Cooling dB
Heating
Energy efficiency ratio Cooling BTU/h W
Heating
Power V-Hz
Power Consumption Cooling W
Heating
Operating Current Cooling A
Heating
Power factor Cooling %
Heating
Starting current A
Power cord Length m
Number of core wire
Fuse capacity A
Outer Width x Height mm
Dimension x Depth inch
Weight
Refrigerant pipe Liquid
mm x L(MT)
GAS mm x L(MT)
Drain hose D x L(mm)
Compressor Type
Motor Type
Rated output
Blower Type
Motor Type
Rated output W
Heat exchanger
Refrigerant control unit
Freezer oil capacity
Refrigerant to change(R-22)
Protection device
Cooling test Condition
Maximum operation Condition
AQ12A5(6)MB
Indoor unit Outdoor unit
Wall-mounting
12000
13000
1.9
7.4 19
8.1 19
41 53
41 53
9.375
10.0
1-220 -60
1280
1300
6.0
6.2
97
95.3
30
-
-
250V-10 / 16A
790 x 245 x 165 762 x 532 x 280
31.1 x 9.6 x 6.5 30 x 20.9 x 11
7.7 35
ø6.35 x 5
ø12.7 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 20STEP
CAPILLARY TUBE
410
800
MRA 12002-9200/MRA 12002-12008
AQ12A5(6)ME
Indoor unit Outdoor unit
Wall-mounting
12000 (3.4)
13000 (3.7)
1.9
7.4 19
8.1 19
41 53
41 53
10.0
10.6
1-220 / 240-50
1200
1230
5.4
5.5
96.6
97.2
30
-
-
250V-10 / 16A
790 x 245 x 165 762 x 532 x 280
31.1 x 9.6 x 6.5 30 x 20.9 x 11
7.7 35
ø6.35 x 5
ø12.7 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 20STEP
CAPILLARY TUBE
410
820
MRA 12030-12008
AS07A3(4)ME/SC07ZA3(4)
Indoor unit Outdoor unit
Wall-mounting
7500
-
1.9
5.3 20.5
--
33 47
--
10.0
-
1-220 / 240-50
750
-
3.3
-
98.8
-
30
-
-
250V-10 / 16A
790 x 245 x 165 660 x 470 x 242
31.1 x 9.6 x 6.5 6.0 x 18.5 x 9
7.7 25
ø6.35 x 5
ø9.52 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 20STEP
CAPILLARY TUBE
360
600
MRA 12086-12008
AS12A1(2)ME/SC12ZA1(2)/SC12ZA1(2)A
Indoor unit Outdoor unit
Wall-mounting
12000
-
1.4
7.4 19
--
38 50
--
10.3
-
1-220 / 240-50
1170
-
5.0
-
101.7
-
30
-
-
250V-10 / 16A
790 x 245 x 165 720 x 532 x 245
31.1 x 9.6 x 6.5 28.3 x 21.0 x 9.6
7.7 38.0
ø6.35 x 5
ø12.7 x 5
ø18 x 2000
ROTARY
--
- 1215
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 2ROW 20STEP
CAPILLARY TUBE
410
1070
MRA 12030-12008
AQ09A7(8)ME/SH09ZA7(8)
Indoor unit Outdoor unit
Wall-mounting
9000 (2.64)
10000 (2.93)
1.4
6.0 20.5
6.7 20.5
38 51
38 51
9.47
10.75
1-220 / 240-50
950
930
4.2
3.9
98.3
10.37
30
-
-
250V-10 / 16A
790 x 245 x 165 660 x 470 x 242
31.1 x 9.6 x 6.5 26 x 18.5 x 9.5
7.7 2.5
ø6.35 x 5
ø9.52 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 18STEP
CAPILLARY TUBE
360
670
MRA 12110-12008
AQ07A7(8)ME/SH07ZA7(8)
Indoor unit Outdoor unit
Wall-mounting
7500 (2.2)
8000 (2.34)
0.9
5.6 20.5
5.5 20.5
35 50
35 50
10.0
10.96
1-220 / 240-50
750
730
3.3
3.2
98.8
99.2
30
-
-
250V-10 / 16A
790 x 245 x 165 660 x 470 x 242
31.1 x 9.6 x 6.5 26 x 18.5 x 9.5
7.7 25
ø6.35 x 5
ø9.52 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 18STEP
CAPILLARY TUBE
360
630
MRA 12086-12008
Perfor-
mance
Power
Size
INDOOR UNIT : DB27°C WB19°C
INDOOR UNIT : DB32°C WB23°C OUTDOOR UNIT : DB35°C WB24°C OUTDOOR UNIT : DB43°C WB26°C
AQ09A5(6)ME/SH09ZA5(6)
Indoor unit Outdoor unit
Wall-mounting
9000 (2.72)
10000 (2.95)
1.4
6.0 18
6.7 18
38 51
38 51
9.375
10.752
1-220 / 240-50
960
930
4.4
4.2
94.9
96.3
30
-
-
250V-10 / 16A
790 x 245 x 165 660 x 497 x 235
31.1 x 9.6 x 6.5 26 x 19.6 x 9.3
7.7 29
ø6.35 x 5
ø9.52 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 18STEP
CAPILLARY TUBE
360
670
RAC 12054-9622
AQ07A5(6)ME/SH07ZA5(6)
Indoor unit Outdoor unit
Wall-mounting
7500 (2.3)
8000 (2.38)
0.9
5.6 18
5.5 18
35 50
35 50
10.0
10.959
1-220 / 240-50
750
730
3.3
3.3
98.8
96.7
30
-
-
250V-10 / 16A
790 x 245 x 165 660 x 497 x 235
31.1 x 9.6 x 6.5 26 x 19.6 x 9.3
7.7 29
ø6.35 x 5
ø9.52 x 5
ø18 x 2000
Rotary
--
--
Cross-flow Propeller
Resin steel
15 25
2ROW 12STEP 1ROW 18STEP
CAPILLARY TUBE
360
630
RAC 12086-9622

Samsung Electronics 3-1
3. Operating Instructions and Installation
3-1 Operating Instructions
To select the 5 way function with the remote control, press the 5 way
button one or more times until the desired mode is selected..
Each time you press the 5 way button
Each 5 way indicator on the indoor unit comes on in order.
Each time you press this button,
FAN SPEED is changed in the following order.
Press until the appearance. the sleep timer can be used when
you are cooling or heating your room to switch the air conditioner off
automatically after a perriod of six hours.
The ON Timer enables you to switch on the air conditioner automatically
after a given period of time that is from 30 minutes to 24 hours.
To cancel the On Time, press the (Set/Cancel) button.
The Off Timer enables you to switch off the air conditioner automatically
after a given period of time that is from 30 minutes to 24 hours.
To cancel the On Time, press the (Set/Cancel) button.
Temp. down button. To decrease the temperature by the pressing
the temperature button
Temp. up button. To increase the temperatute by the pressing
the temperature button
FUNCTION OF KEY
3-1-1 Name & Function of Key in remote controller
(DOWN)
Power On/Off button to start and stop airconditioner or timer set up
Press until the appearance. the air condition cools or heats
the room as quickly as possible. after 30minutes, the air,
the airconditioner is reset automatically to the previous mode
NAMED OF KEY
(UP)
NO
1
2
3
4
5
6
7
8
9
Adjust air flow vertically.
Each time you press this button
Mode is changed in the following order : Auto Mode : Fan Only
: Cool Mode : Heat Mode
: Dry Mode
00181_OIAIN_5 11/6/00 5:09 PM Page 3-1

Operating Instructions and Installation
3-2 Samsung Electronics
1. AUTO MODE : In this mode, operation
mode(COOL, HEAT) is selected automati-
cally by the room temperature of initial
operation.
ÆT= -1¡C, -2¡C, 0¡C+1¡C+2¡C
ÆT is controlled by setting temperature
up/down key of remote controller
2. COOL MODE : The unit operates according
to the difference between the setting and
room temperature. (18¡C~30¡C)
3. HEAT MODE : The unit operates according
to the difference between the setting and
room temperature.(16¡C~30¡C)
*Prevention against cold wind : For about
3~5 minutes after initial operation, thermo
control or Òde-iceÓ, the indoor fan will
either not operate or operate very slowly,
then switch to the selected fan speed. This
period is to allow the indoor unit's heat-
exchanger to prewarm before emitting
warm air.
*High temperature release function : The
outdoor unit for and compressor ON/OFF
control for safety operation, when the over-
heat is heat exchanger of indoor unit.
*De-ice : Deicing operation is controlled by
indoor unit's heat exchanger temperature
and accumulating time of compressor's
operation.
De-ice end by sensing of the processing
time by de-ice Condition.
4. DRY MODE : Has 3 states, each determined
by room temperature.
The unit operates in DRY mode.
*Compressor ON/OFF Time is controlled
compulsorily(can not set up the fan speed,
always breeze).
*Protective function : Low temperature
release. (Prevention against freeze)
5. TURBO MODE : This mode is available in
AUTO, COOL, HEAT, DRY, FAN MODE.
When this button is pressed at first, the air
conditioner is operated ÒpowerfulÓ state for
30 minutes regardless of the set tempera-
ture, room temperature.
When this button is pressed again, or when
the operating time is 30 minutes, turbo
operation mode is canceled and returned to
the previous mode.
*But, if you press the TURBO button in DRY
or FAN mode that is changed with AUTO
mode automatically.
6. SLEEP MODE : Sleep mode is available
only in COOL or HEAT mode.
The operation will stop after 6 hours.
*In COOL mode : The setting temperature
is automatically raised by 1¡C each 1hour
When the temperature has been raised by
total of 2¡C, that temperature is main-
tained.
*In HEAT mode : The setting temperature
is automatically droped by 1¡C each 1hour.
When the temperature has been droped by
total of 2¡C, that temperature is main-
tained.
7. FAN SPEED : Manual (3 step), Auto (4 step)
Fan speed automatically varies depending
on both the difference between setting and
the room temperature.
Room Temp
Tr≥21°C+∆T
21°C +∆T>Tr
Operation Type
Cool Operation (Set Temp:AUTO SETTING)
Heat Operation (Set Temp : 22°C+∆T)
3-1-1 Name & Function of Key in remote controller
00181_OIAIN_5 11/6/00 5:09 PM Page 3-2

Operating Instructions and Installation
3-3
Samsung Electronics
8. COMPULSORY OPERATION :
For operating the air conditioner without
the remote controller.
*AUTO : The operating is the same func-
tion that AUTO MODE in the remote con-
troller. And each time you press the button
the 5WAY func-tion is changed as follow.
STD ➝ NATURE ➝ POWER ➝ SAVING ➝
SILENCE ➝ POWER OFF
Each time you press This button, 5WAY
function is changed in the following order
STD(standard) ➝ NATURE ➝
POWER(High-speed) ➝ Saving(Power-
Saving) ➝ Quite
❊ STD(standard)( ) : General operation
Mode
❊ NATURE( ) : The unit is operated
according to health
pattern control
❊ POWER( ) : The unit is
operated in
powerful state
❊ SAVING( ) : The unit is operated in
power saving state
❊ SILENCE( ) : The unit is operated
quitely
Each mode has Auto, Cool and SLEEP oper-
ation designed in advance.
9. SWING : BLADE-H is rotated vertically by
the stepping motor.
*Memory louver : When ON/OFF button is
pressed at stop state, the BLADE-H returns
to its original location which is operating
state before stop
*Swing Set : Press the button under the
remote control is displayed on LCD the
and the blades move up and down. If the one
more time press the button, blades loca-
tion is stop.
10. 24-Hour ON/OFF Real Setting Timer. : The
air conditioner is turned ON at a specified
time using .
OFF TIMER : The air Conditioner is turned
OFF at a specified time using .
*ON TIMER : Only timer LED lights on.
*OFF TIMER : Both timer and operation
LED lights on.
11. SELF Diagnosis
12. BUZZER SOUND : Whenever the ON/OFF
button is pressed or whenever change
occurs to the condition which is set up or
select, the compulsory operation mode,
buzzer is sounded "beep"
Indoor unit room temperature sensor
error(open or short)
Check Point
LED DISPLAY
TIMER STD NATURE POWER SAVING SILENCE
LED
:blinking : LED off
Indoor unit heat exchanger temperature
sensor error(open or short)
Indoor fan mal function
EEPROM error
Option error(option wasnÕt set up or
option data error)
00181_OIAIN_5 11/6/00 5:10 PM Page 3-3

3-4 Samsung Electronics
MEMO
00181_OIAIN_5 11/6/00 5:10 PM Page 3-4

Samsung Electronics 4-1
4. Disassembly and Reassembly
4-1 Indoor Unit
Stop operation of the air conditioner and remove the power cord before repairing the unit.
No Parts Procedure Remark
1 Front Grille 1) Stop the air conditioner operation and block
the main power.
2) Separate tape of front panel upper.
3) Contract the second finger to the left, and
right handle and pull to open the inlet grille.
4) Take the left and right filter out.
5) Loosen one of the right fixing screw and
separate the terminal cover.
6) Loosen three fixing screws of front grille.
7) Pull the upper left and right of discharge
softly for the outside cover to be pulled out.
8) Pull softly the lower part of discharge and
push it up.
Caution;
Assemble the front panel and fix the
hooks of left and right.
*Taking off the deodorizing filter.
00181_DAREA_6 11/6/00 5:05 PM Page 4-1

Disassembly and Reassembly
Samsung Electronics
No Parts Procedure Remark
2
3
4
5
Ass’y Tray Drain.
Electrical Parts
(Main PCB)
Heat Exchanger
Fan Motor and
Cross Fan
1) Do “1”above
2) Take all the connector of PCB upper side out.
(Inclusion Power cord)
3) Separate the outdoor unit connection wire
from the terminal block.
4) If pulling the Main PCB up. it will be taken
out.
1) Do “1”, “2”, above
Separate the drain hose from the extension
drain hose.
2) Pull tray drain out from the back body.
1) Do “1” and “2”, “3”, above
2) Loosen two fixing earth screws of right side.
3) Separate the connection pipe.
4) Separate the holder pipe at the rearside.
5) Loosen the three fixing screws of right and
left side.
6) Lifting the heat exchanger up a little to push
the up side for separation from the indoor
unit.
1) Do “1” “2” ”3” “4”, above.
2) Loosen the fixing two screws and separate
the motor holder.
3) Loosen the fixing screw of fan motor.
(By use of M3 wrench)
4) Separate the fan motor from the fan.
5)Separate the fan from the left holder bearing.
4-2
00181_DAREA_6 11/6/00 5:05 PM Page 4-2

4-3
Samsung Electronics
4-2 Outdoor Unit
• UQ12A5(6)M✳
No Parts Procedure Remark
1Common Work 1) Loosen the fixing screw and separate the
Handle-Cabi RH.
2) Separate the connection wire from the termi-
nal block.
3) Loosen 6 fixing screws and separate the
upper cabinet.
4) Loosen the fixing screw of Ass'y E-part.
5) Loosen 5 fixing screws and separate the side
cabinet.
00181_DAREA_6 11/6/00 5:05 PM Page 4-3

4-4 Samsung Electronics
Disassembly and Reassembly
No Parts Procedure Remark
2 Fan-Motor 1) Loosen 4 fixing screw of the Guard-Fan.
2) Remove the nut flange (Turn to the right to
remove, as it is a left hand screw)
3) Separate the fan.
4) Loosen four fixing screws to separate the
motor.
00181_DAREA_6 11/6/00 5:06 PM Page 4-4

Disassembly and Reassembly
4-5
Samsung Electronics
No Parts Procedure Remark
1
2
Common Work
Fan and Motor
1) Loosen the fixing two screws and separate
the cover E-parts.
2) Separate the connection wire from the termi-
nal block.
3) Loosen five fixing screws and separate the
cabi Upper.
4) Loosen two fixing screws of Ass'y E-part.
5) Loosen nine fixing screws and separate the
cabi side.
1) Do “1”, above.
2) Loosen four screws and seperaate Guard Fan
from front cabinet
• SH09ZA5(6)X
• UQ09A5(6)M✳
• SH07ZA5(6)X
• UQ07A5(6)M✳
00181_DAREA_6 11/6/00 5:06 PM Page 4-5

4-6 Samsung Electronics
Disassembly and Reassembly
No Parts Procedure Remark
3
4
Heat Exchanger
Compressor
2) Remove the nut flange (Turn to the right to
remove, as it is a left hand screw)
3) Separate the fan.
4) Loosen four fixing screws to separate the
motor.
1) Do “1”, 2 above.
2) Loosen two fixing screws of left and right
side.
3) Disassemble the inlet and outlet pipe by
welding.
4) Separate the heat exchanger.
1) Do “1”, above.
2) Loosen the nut on the terminal cover and
open the terminal cover.
3) Disassemble the inlet and outlet pipe of com-
pressor by welding.
4) Disassemble the inlet and outlet pipe of con-
denser by welding
5) Loosen the three bolts of the lower part.
6) separate the compressor.
00181_DAREA_6 11/6/00 5:06 PM Page 4-6

4-7
Samsung Electronics
• SH07ZA7(8)X/SH09ZA7(8)X
• UQ07A7(8)M✳/UQ09A7(8)M✳
No Parts Procedure Remark
1 Common Work 1) Loosen the fixing tow screws and separate
the COVER TERMINAL
2) Loosen the fixing two screws and seperate
the cover control
3) Separate the connection wire from the termi-
nal block.
4) Loosen six fixing screws and separate the
cabi front.
5) Loosen the one fixing screw of Ass'y E-part.
6) Loosen 12 fixing screws and separate the
cabi side.
00181_DAREA_6 11/6/00 5:06 PM Page 4-7

Disassembly and Reassembly
4-8 Samsung Electronics
No Parts Procedure Remark
2
3
4
Fan and Motor
Heat Exchanger
Compressor
1) Do “1”, above.
2) Remove the nut flange (Turn to the right to
remove, as it is a left hand screw)
3) Separate the fan.
4) Loosen Four fixing screws to separate the
motor.
5) Loosen two fixing screws and seperate the
motor bracket from. the base.
1) Do “1”,“2”, above.
2) Loosen two fixing screws of left and right
side.
3) Disassemble the inlet and outlet pipe by
welding.
4) Separate the heat exchanger.
1) Do “1”,“2”,“3”, above.
2) Open the terminal cover of compressor and
unscrew the connection terminal.
3) Disassemble the inlet and outlet pipe of com-
pressor by welding.
4) Loosen the three bolts of the lower part.
5) separate the compressor.
00181_DAREA_6 11/6/00 5:07 PM Page 4-8

Samsung Electronics 5-1
1) The input voltage should be rating voltage ±10% range.
The airconditioner may not operate properly if the voltage is out of this range.
2) Is the link cable linking the indoor unit and the outdoor unit linked properly?
The indoor unit and the outdoor unit shall be linked by 5 cables.
Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables.
Otherwise the airconditioner may not operate properly.
3) When a problem occurs due to the contents illustrated in the table below it is a symptom not related to the
malfunction of the airconditioner.
4) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details
on the display panel.
5. Troubleshooting
5-1 Items to be checked first
NO Operation of air conditioner
1 The STD operation indication LED blinks when a
power plug of the indoor unit is plugged in for the first time.
2 In a COOL operation mode, the compressor does not
operate at a room temperature higher than the setting
temperature that the INDOOR FAN should operate.
In a HEAT operation mode, the compressor does not
operate at a room temperature lower than the setting
temperature that indoor fan should operate.
3 Fan speed setting is not allowed in AUTO or DRY mode.
4 Compressor stops operation intermittently in DRY mode.
5 Compressor of the outdoor unit is operating although it is
turned off in a HEAT mode.
6 Timer LED only of the indoor unit lights up and the
air conditioner does not operate.
7 The compressor and indoor fan stop intermittently in HEAT
mode.
8 Indoor fan and outdoor fan stop operation intermittently in
a HEAT mode.
9 The compressor stops intermittently in a COOL mode or DRY
mode, and fan speed of the indoor unit decreases.
It indicates power is on. The LED stops blinking if the operation
ON/OFF button on the remote control unit is pushed.
In happens after a delay of 3 minutes when the compressor is reoper-
ated. The same phenomenon occurs when a power is on.
As a phenomenon that the compressor is reoperated after a delay of
3 minutes, the indoor fan is adjusted automatically with reference
to a temperature of the air blew
The speed of the indoor fan is set to LL in DRY mode.
Fan speed is 5 steps is selected automatically in AUTO mode.
Compressor operation is controlled automatically in DRY mode
depending on the room temperature and humidity.
When the unit is turned off while de-ice is activated, the compressor
continues operation for up to 9 minutes (maximum) until the deice is
completed.
Timer is being activated and the unit is in ready mode.
The unit operates normally if the timer operation is cancelled.
The compressor and indoor fan stop intermittently if room temperature
exceeds a setting temperature in order to protect the compressor from
overheated air in a HEAT mode.
The compressor operates in a reverse cycle to remove exterior ice in a
HEAT mode, and indoor fan and outdoor fan do not operate intermit-
tently for within 20% of the total heater operation
Thecompressorstopsintermittentlyorthefanspeedoftheindoorunit
decreases to prevent inside/outside air frozen depending on the
inside/outside air temperature.
Explanation
NO Display
1 STD LED blinking (1Hz)
2 TIMER LED blinking (1Hz)
3 STD and TIMER LED blinking (1Hz)
4 NATURE LED blinking (1Hz)
Restore from power failure (input initial power)
Indoor unit Room sensor Error (open or short)
Indoor unit heat exchanger temperature sensor Error (open or short)
Indoor fan malfunctioning (for spead is Below 450rpm)
Self Diagnosis
00181_TSHOO_9 11/6/00 5:17 PM Page 5-1

Samsung Electronics
5-2
5-2 Fault Diagnosis by Symptom
5-2-1 No Power (completely dead)-Initial diagnosis
1) Checklist :
(1) Is input voltage normal?
(2) Is AC power linked correctly?
(3) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2) Troubleshooting procedure
Replace PCB
display
Is DC voltage of PCB
display normal?
Remove power cord and plug in
again in approx. 5 seconds
Is operation lamp blinking?
Does operation start when
ON/OFF button on the remote
controller unit pushed?
Is transmission display of the
remote controller unit blinking?
Is "beep"sound heard from the main
unit?
Is DC voltage of the PCB module
normal?
Are voltages of #8 (compressor),
#7(4 way valve) and #6 (outdoor fan)
of the micom normal? 5VDC
Is voltage of #60 (indoor fan) of the
micom normal?
Is voltage at #50 terminal of the Micom normal?
0VDC
Is voltage at #18 terminal of the Micom normal?
5VDC
Is rating voltage ±10% range
applied to the primary side(~,~)
of the “BD71”
•Check linkage between
power cord and
terminal tap
•Check fuse
Is 325VDC appear in the
secondary side (+, -)
of “BD71”
Replace
SMPS PARTS
YES
NO YES
NO
YES
YES
YES
NO
YES
YES
YES
DC5V
10ms
10ms
250ns
NO
NO
OK
YES
YES
YES
YES
NO
NO
YES Normal
Refer to remote control
unit fault diagnosis
Replace PCB
module.
Is output voltage of ICO2 normal?
Check connections
compressor
and indoor fan.
Are voltages at RY71(Compressor)
normal? DC12V
Is voltage at SS71(indoor fan)
Replace
RY71 and
SS71
NO
NO
NO
Is voltage output terminal of
TLP180(PC02) normal?
Replace ICO2
CheckPCBpattern.
ReplacemainPCB.
Replace TLP180(pc02)
Replace
micom
Is voltage at #52 terminal of the micom
normal?
Are voltage at #48 and #49 of the
micom normal?
NO
NO NO
YESNO
NO
NO
YES
OK
Is operation normal?
Replace resonator (X301)
00181_TSHOO_9 11/6/00 5:17 PM Page 5-2

Samsung Electronics 5-3
5-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is the indoor unit fan motor properly connected with the connector (CN72)?
(2) Is the AC voltage correct?
(3) Is HALL IC in indoor fan motor properly connected with the connector (CN42)?
(4) Is the running capacitor (CR71) properly connected with PCB board?
2) Troubleshooting procedure
Troubleshooting
After unplugging out the power cord should
be reconnected within five seconds.
Does the STD lamp(Green) blink?
Does the Solid State Relay(SS71) work
properly?
Is the supply voltage of the fan
motor sufficient?
Test rod location
PCB CN72 Condition
Fan operate about AC 180V
Normal
voltage
pin #3 and #5
YES
YES
YES
NO
NO
NO
Check as in the procedure “NO power parts” Refer tp
page 5-2.
Microcomputer is out of order.
PCB is
out of order. PCB should be replaced.
Replace MFC
Fan motor
should be replaced.
Fan motor
is out of order.
MF-C is out of order
YES
-
Test rod location
+
SS71- SS71- 12V
Normal
Voltage
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