Logitech MSZ-A09NA, EDITION-B User Manual
Revision C:
• SPECIFICATION has been corrected.
Please void OB450 REVISED EDITION-B.
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MSZ-A09NA MSZ-A24NA
No. OB450
REVISED EDITION-C
MSZ-A09NA -
1
MSZ-A24NA MSZ-A12NA MSY-A15NA
MSZ-A12NA -
1
MSY-A15NA MSZ-A15NA MSY-A17NA
MSZ-A15NA -
1
MSY-A17NA MSZ-A17NA MSY-A24NA
MSZ-A17NA -
MSZ-A09/12/15/17NA
MSY-A15/17NA
1
MSY-A24NA -
Outdoor unit service manual
MUZ-A·NA Series (OB451)
MXZ-A·NA Series (OB444)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM ············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. TROUBLESHOOTING ······································11
9. DISASSEMBLY INSTRUCTIONS ···················· 25
10. PARTS LIST ····················································· 30
10-1. PARTS LIST ············································ 30
10-2. RoHS PARTS LIST ································· 36
11. MICROPROCESSOR CONTROL ···················· 42
1
1
1
1
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the PARTS
LIST (RoHS compliant).
Revision A :
• PARTS LIST has been revised. (10-1.8, 10-2.8)
Revision B :
• MSZ-A•NA-1 and MSY-A•NA Remote controller has been changed.
1
Revision C :
• SPECIFICATION has been corrected.
Powerful has been added. (Airflow , Sound level)
1
MSZ09UN MSZ-A09NA
MSZ12UN MSZ-A12NA
MSH15TN MSZ-A15NA
MSH17TN MSZ-A17NA
1. Control method between indoor and outdoor has been changed.
2. Indoor fan motor has been changed.
3. Signal of remote controller has been changed. (It is not available for conventional models.)
MSZ-A09NA MSZ-A09NA-
MSZ-A12NA MSZ-A12NA-
MSZ-A15NA MSZ-A15NA-
MSZ-A17NA MSZ-A17NA-
1. Remote controller has been changed.
• Temperature indication function (°F/°C) has been added. (Refer to 11-10.)
Models Remote controller Temperature indication
MSZ-A09/12/15/17NA KM06A °F
MSZ-A09/12/15/17NAMSZ-A24NA KM06B °F
MSZ-A24NA MSY-A15/17NA KM06C °F
MSY-A15/17NA MSY-A24NA KM06D °F
MSY-A24NA -
• Timer indication has been changed. (AM/PM indication)
2. Conduit plate has been removed. (MSZ-A09/12/15/17, MSY-A15/17)
3. Conduit cover, terminal block cover and terminal block holder have been changed. (MSZ-A09/12/15/17, MSY-A15/17)
TECHNICAL CHANGES
MSH24WN MSZ-A24NA
MS15TN MSY-A15NA
MS17TN MSY-A17NA
MS24WN MSY-A24NA
MSZ-A24NA MSZ-A24NA-
1
MSY-A15NA MSY-A15NA-
1
MSY-A17NA MSY-A17NA-
1
MSY-A24NA MSY-A24NA-
1
1
1
1
1
KM07J °F/°C
KM07K °F/°C
KM07L °F/°C
KM07M °F/°C
1
1
1
1
2
2
PART NAMES AND FUNCTIONS
MSZ-A09NA MSY-A15NA
MSZ-A12NA MSY-A17NA
MSZ-A15NA
MSZ-A17NA
Panel
Air cleaning filter
(Anti-Allergy Enzyme
Filter, Blue bellows
type)
Catechin air filter
Air outlet
Vertical vane
Horizontal vane
Line flow fan
MSZ-A09NA
MSZ-A12NA
Front panel
Air inlet
Heat exchanger
Operation section
(When the front panel is opened)
MSZ-A15NA
MSZ-A17NA
MSY-A15NA
MSY-A17NA
MSZ-A24NA
MSY-A24NA
Remote controller
Display section
Operation Indicator
lamp
Emergency operation switch
Remote control
receiving section
MSZ-A24NA
MSY-A24NA
Emergency operation switch
Operation indicator lamp
Remote control
receiving section
ACCESSORIES
MSZ-A09/12/15/17NA
MSY-A15/17NA
Installation plate 1 1 1
Installation plate fi xing screw 4 × 25 mm 8 5 7
Remote controller holder 1 1 1
Fixing screw for 3.5 × 1.6 mm (Black) 2 2 2
Battery (AAA) for remote controller 2 2 2
Wireless remote controller 1 1 1
Felt tape (Used for left or left-rear piping) 1 1 1
Conduit plate 1 – –
3
MSZ-A09/12/15/17NA-
MSY-A15/17NA- 1
1
MSZ-A24NA
MSY-A24NA
3
SPECIFICATION
Indoor unit model
External fi nish
Power supply V, phase, Hz
Max.-fuse size (time delay) / Disconnect switch A
Min. circuit ampacity A
Fan motor F.L.A
Airfl ow
Low–Med.–High–Powerful
Moisture removal pt./h
Sound level
Low–Med.–High–Powerful
Cond. drain connection O.D. in.
Dimensions
Weight Ib.
Remote controller
Control voltage (by built-in transformer)
Indoor unit model
External fi nish
Power supply V, phase, Hz
Max.-fuse size (time delay) / Disconnect switch A
Min. circuit ampacity A
Fan motor F.L.A
Airfl ow
Low–Med.–High–Powerful
Moisture removal pt./h
Sound level
Low–Med.–High–Powerful
Cond. drain connection O.D. in.
Dimensions
Weight Ib.
Remote controller
Control voltage (by built-in transformer)
COOL Dry (Wet)
HEAT
COOL
HEAT
W
D
H
COOL Dry (Wet)
HEAT
COOL
HEAT
W
D
H
CFM
dB(A)
in.
CFM
dB(A)
in.
MSZ-A09NA MSZ-A12NA
White
208/230, 1, 60
15
1.0
152-229-307-338
(134-205-275-303)
159-222-307-321 159-240-353-353
2.3 3.2
22-33-38-41 22-34-42-44
22-33-38-39 22-34-42-42
MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA
268-328-381-419 (240-293-342-376)
254-314-381-381 — 254-314-381-381 —
4.7 5.1
34-40-45-47 34-40-46-48
34-38-44-44 — 34-38-44-44 —
0.76
5/8
30-11/16
8-/1/4
11-/3/4
23
Wireless type
12-24 VDC
White
208/230, 1, 60
15
1.0
0.76
5/8
30-/11/16
8-/1/4
11-/3/4
23
Wireless type
12-24 VDC
152-240-353-388
(134-215-318-349)
Indoor unit model
External fi nish
Power supply V, phase, Hz
Max.-fuse size (time delay) / Disconnect switch A
Min. circuit ampacity A
Fan motor F.L.A
Airfl ow
Low–Med.–High–Powerful
Moisture removal pt./h
Sound level
Low–Med.–High–Powerful
Cond. drain connection O.D. in.
Dimensions
Weight Ib.
Remote controller
Control voltage (by built-in transformer)
NOTE : Test conditions are based on ARI 210/240.
1 : Rating conditions (Cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB)
(Heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB
2 : (Heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB
COOL Dry (Wet)
HEAT
COOL
HEAT
W
D
H
CFM
dB(A)
in.
MSZ-A24NA MSY-A24NA
296-431-568-624 (265-385-508-558)
296-486-568-590 —
34-40-48-49 —
4
White
208/230, 1, 60
15
1.0
0.76
7.3
34-40-49-51
5/8
43-/5/16
10-/1/4
12-13/16
37
Wireless type
12-24 VDC
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed Voltage (V)
Indoor unit
208/230 V
1 phase
60 Hz
Min.187
208 230 Max.253
(2) OPERATION
Intake air temperature (°F)
Mode Condition
Standard temperature 80 67 95 —
Cooling
Heating
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 14 13
DB WB DB WB
Indoor Outdoor
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
Model Mode Function Air fl ow (CFM)
HEAT Dry 307 16.8 23.4
MSZ-A09NA
MSZ-A12NA
MSZ-A15NA HEAT Dry 381 20.9 28.8
MSZ-A15NA
MSY-A15NA
MSZ-A17NA HEAT Dry 381 20.9 28.8
MSZ-A17NA
MSY-A17NA
MSZ-A24NA HEAT Dry 568 20.2 34.4
MSZ-A24NA
MSY-A24NA
COOL
HEAT Dry 353 19.3 26.7
COOL
COOL
COOL
COOL
Dry 307 16.8 23.4
Wet 275 15.1 21.0
Dry 353 19.3 26.7
Wet 318 17.4 24.1
Dry 381 20.9 28.8
Wet 342 18.8 26.0
Dry 381 20.9 28.8
Wet 342 18.8 26.0
Dry 568 20.2 34.4
Wet 508 18.1 30.9
Air speed
(ft./sec.)
Coverage
range (ft.)
● The air coverage range is the
fi gure up to the position where
the air speed is 1 ft./sec., when
air is blown out horizontally
from the unit properly at the
High speed position.
The coverage range should be
used only as a general guideline since it varies according to
the size of the room and furniture arranged inside the room.
5
4
OUTLINES AND DIMENSIONS
MSZ-A09NA MSY-A15NA
MSZ-A12NA MSY-A17NA
MSZ-A15NA
MSZ-A17NA
30-11/16
11-3/4
Conduit plate(MSZ-A•NA- and MSY-A•NA- are excluded.)
7/16x1 Oblong hole
Installation plate
Indoor unit
7/16x13/16
2-3/16 2-3/16
10-1/8
1-5/8 8-7/16
2-3/16
13-3/16 12-5/8
Air in
8-1/4
Oblong hole
8-7/8 8-7/8
7/8
6-1/8 6-1/8
3/16
Installation plate
hole
1-3/4
{
Unit : inch
9/1610-3/4
7/8
8-7/16
9-3/16
11-5/16
2-3/4
Wall hole 2-9/16
Liquid line 1/4 19-11/16
Gas line 3/8 16-15/16
Insulation 1-3/8 O.D
3/4 I.D
1/8
1-11/16
2-1/8
2-5/16
6-1/4
3/4
Drain hose 5/8
424-9/16
Air out
(Connected part O.D)
Insulation 1-1/8
6
MSZ-A24NA
MSY-A24NA
Unit : inch
12-13/16
2-3/16
2-5/16
42-1/16
43-5/16
31-1/8
3/4
9-15/16
Installation plate
3-7/8
1-7/8
3-7/8 6-13/16
Air in
16-5/16 16-5/16
Wall hole 3
10-1/4
Air out
3/16
Indoor unit
Installation plate
Liquid line 1/4 19-11/16
Gas line 5/8 16-15/16
{
Insulation 1-15/16 O.D
Drain hose 5/8
(Connected part O.D)
Insulation 1-1/8
6-13/16
1-1/4 I.D
1/8
10-1/161-7/8
5/16
12-3/8
6-1/4
Wireless remote controller
7
5
MSZ-A09NA MSY-A15NA
MSZ-A12NA MSY-A17NA
MSZ-A15NA
MSZ-A17NA
WIRING DIAGRAM
MSZ-A24NA
MSY-A24NA
8
6
REFRIGERANT SYSTEM DIAGRAM
MSZ-A09NA
MSZ-A12NA
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12(main)
Indoor coil
thermistor
RT13(sub)
Refrigerant pipe ø3/8
(with heat insulator)
Flared connection
Flared connection
MSZ-A15NA MSY-A15NA
MSZ-A17NA MSY-A17NA
Refrigerant pipe ø1/2
(with heat insulator)
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12(main)
Distributor
Indoor coil
thermistor
RT13(sub)
Flared connection
Flared connection
Unit : inch
MSZ-A24NA
MSY-A24NA
Indoor
heat
exchanger
Indoor coil
thermistor
RT13(sub)
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12(main)
Distributor
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant pipe ø5/8
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
9
7
SERVICE FUNCTIONS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 8-7.)
Set time : 1-minute 1-second
Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit-of JPG and JPS.)
7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
NOTE : For modification, take out
the batteries and press
the OPERATE/STOP(ON/
OFF)button twice or 3
times at first.
After finish modification,
put back the batteries then
J1
J2
press the RESET button.
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modifi cation Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
10
7-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment
power has restored after power failure. Then, the unit will restart automatically.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes
for the compressor to start running.)
How to release “AUTO RESTART FUNCTION”
Turn off the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 8-7.)
MSZ-A09/12/15/17NA
MSY-A15/17NA
JR07
BZ
CN151 CN211CN112
MSZ-A24NA
MSY-A24NA
JR07
BZ
CN101
CN211CN112
CN152
CN151
NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the
remote controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is
cancelled.
• If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as
the power button of the remote controller is off.
• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the
same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting
current by adding to the system that allows the units to start one by one.
8
TROUBLESHOOTING
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA
8-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
11
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing ON and OFF before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) When troubleshooting, refer to 8-2., 8-3. and 8-4.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
Remove the front lid and insert batteries.
Then reattach the front lid.
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
Press RESET button with tip end of ball point pen
or the like, and then use the remote controller.
RESET button
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the
battery replacement.
INFORMATION FOR MULTI SYSTEM AIR CONDITIONER
OUTDOOR UNIT : MXZ series
Multi system air conditioner can connect two or more indoor units with one outdoor unit.
• Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not
connect indoor units beyond the outdoor unit capacity.
Operation indicator lamp flashes as shown in the figure below.
• When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling
and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other
indoor units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor
units to the same operation mode.
OPERATION INDICATOR
Lighted
Blinking
Not lighted
• When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes
(max. 10 minutes) to blow out the warm air.
• In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant
flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
12
8-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (8-4.) disappears, the memorized failure details can
be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality doesn't recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
Those figures show about MSZ-A09/12/15/17.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature
is displayed) with the remote controller headed towards the indoor unit.
Does the left lamp of OPERATION INDICATOR lamp on the
indoor unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal. Beep is emit-
ted at the same timing as the blinking of the left lamp
of OPERATION INDICATOR lamp. 2
Yes
Judgment of indoor/outdoor abnormality
Releasing the failure mode recall function
Deleting the memorized abnormal condition
NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
The indoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the indoor unit
failure mode table. (8-2.2.)
Make sure to check at least two consecutive blinking cycles.
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
(Blinks)
No
1
1. Regardless of normal or abnormal condition, a short
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnor-
No
(OFF)
Yes
2
malities that can't be recalled with this way.
Confi rm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function.
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the
outdoor unit failure mode table. (Refer to outdoor unit service manual.)
Make sure to check at least two consecutive blinking cycles.
beep is emitted once the signal is received.
3
2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.5-
2.5-second OFF
second interval
2.5-second OFF
ON
OFF
Beeps
Repeated cycle Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
2.5-second OFF 3-second ON
ON
OFF
No beep Beeps
Repeated cycle
Blinking at 0.5second interval
Blinking at 0.5second interval
Beeps
2.5-second OFF 3-second ON
13
Beeps
Repeated cycle
Blinking at 0.5second interval
No beep Beeps
Repeated cycle
Repeated cycle
2. Indoor unit failure mode table
Left lamp of OPERATION
INDICATOR lamp
Not lighted Normal — —
1-time fl ash every
0.5-second
2-time fl ash
2.5-second OFF
3-time fl ash
2.5-second OFF
11-time fl ash
2.5-second OFF
12-time fl ash
2.5-second OFF
Abnormal point
(Failure mode)
Room temperature
thermistor
Indoor coil
thermistor
Serial signal
Indoor fan motor
Indoor control
system
Condition Correspondence
The room temperature thermistor short or
open circuit is detected every 8 seconds during operation.
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
The serial signal from outdoor unit is not received for a maximum of 6 minutes.
The rotational frequency feedback signal is
not emit during the 12 seconds the indoor fan
operation.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Refer to the characteristics of the room temperature
thermistor (8-7.).
Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (8-7.).
Refer to 8-6.
signal error".
Refer to 8-6. "Check of indoor fan motor".
Replace the indoor electronic control P.C. board.
"How to check miswiring and serial
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).
14
8-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Outdoor unit
doesn't operate.
Outdoor unit
operates only
in Test Run
operation.
Check room
temperature
thermistor.
Refer to 8-7.
"Test point
diagram and
voltage".
Outdoor
unit doesn't
operate even
in Test Run
operation.
Refer to "How
to check
inverter/compressor".
Indoor unit operates.
Outdoor unit doesn't
operate normally.
Unit doesn't
operate normal operation
in COOL or
HEAT mode.
Refer to
"Check of R.V.
coil".
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Refer to 8-6.
"Check of remote
controller and
receiver P.C.
board".
OPERATION INDICATOR
lamp on the indoor unit is
fl ashing on and off.
Indoor unit
doesn't operate,
when EMERGENCY OPERATION switch is
pressed.
1. Check indoor/outdoor connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 8-6. "Check
of indoor electronic
control P.C. board and
indoor fan motor".
If blinking of OPERATION INDICATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
"Test Run operation" means
the operation within 30 minutes
after EMERGENCY OPERATION switch is pressed.
Refer to outdoor unit service manual.
Left lamp
Flash on and
off at 0.5-second intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Refer to 8-6.
"How to
check miswiring and
serial signal
error".
Left lamp
2-time fl ash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Check room
temperature
thermistor
and indoor
coil thermistor. Refer
to 8-7."Test
point diagram
and voltage".
Left lamp
3-time fl ash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Refer to 8-6.
"Check of
indoor fan
motor".
Left lamp
4-time fl ash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Replace the
indoor electronic control
P.C. board.
15
Left lamp
5-time fl ash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Refer to
"How to
check
inverter/compressor".
Left lamp
6-time fl ash
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Refer to
"Check of
outdoor thermistors".
Left lamp
7-time fl ash
Cause:
Outdoor unit
• Trouble of
outdoor control system
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Left lamp
14-time fl ash
Cause:
Outdoor unit
• Other abnormality
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall function."
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