Mitsubishi TPKA0A0241KA80A User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL................................... 2
2. SAFETY PRECAUTION................................... 3
3. PARTS NAMES AND FUNCTIONS................. 5
4. SPECIFICATIONS............................................ 6
5. NOISE CRITERION CURVES.......................... 7
6. OUTLINES AND DIMENSIONS........................ 8
7. WIRING DIAGRAM........................................... 9
8. REFRIGERANT SYSTEM DIAGRAM............ 10
9. TROUBLESHOOTING....................................11
10. FUNCTION SETTING..................................... 25
11. SPECIAL FUNCTION..................................... 26
12. DISASSEMBLY PROCEDURE....................... 29
13. REMOTE CONTROLLER............................... 33
PARTS CATALOG (TCBT011)
No. TCHT011
August 2023
WIRED REMOTE
CONTROLLER
(Option)
INDOOR UNIT
WIRELESS REMOTE
CONTROLLER
(Option)
MENU ON
OFF
RETURN SELECT
HOLD
Indoor unit
[Model Name]
TPKA0A0241KA80A
TPKA0A0301KA80A
TPKA0A0361KA80A
SPLIT-SYSTEM HEAT PUMP
/HDHVWHPDQXDOGHLQVWUXFFLRQHVKDVWDHO¿QDODQWHVGHSRQHUHQPDUFKDODXQLGDGGHDLUHDFRQGLFLRQDGRSDUD
MITSUBISHI ELECTRIC TRANE HVAC US

2 3
TCHT011
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
Wired remote controller Wireless remote controller
Remote controller (Optional parts)
Model Name Service Manual No. / PARTS CATALOG No.
TRUZA024/301HA70NA
TRUZA0361KA70NA
TRUYA024/301HA70NA
TRUYA0361KA70NA
OCHT636 / OCBT636
TRUZA024/301HA80NA
TRUZA0361KA80NA
TRUYA024/301HA80NA
TRUYA0361KA80NA
OCHT764 / OCBT764
TRUZH0241HA10NA
TRUZH030/361KA00NA OCHT750 / OCBT750
MENU ON
OFF
RETURN SELECT
HOLD

2 3
TCHT011
SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R410A
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
In case of using the existing pipes for R22, be careful with
the following:
· Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
· In case of reconnecting the refrigerant pipes after
detaching, make the flared part of pipe re-fabricated.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Store the piping indoors, and keep both ends
of the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
Preparation before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off
the power-supply breaker.
• Discharge the condenser before the work involving the
electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts
with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be
done without turning off the power, exercise great caution
not to touch the live parts.
• When opening or closing the valve below freezing
temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in
injuries.

4 5
TCHT011
[1] Warning for service
(1) Do not alter the unit.
(2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe
components specifically made for use with refrigerant specified in the outdoor unit installation manual.
(3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
(4) This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual.
Refer to outdoor unit installation manual.
(5) For appliances not accessible to the general public.
(6) Refrigerant pipes connection shall be accessible for maintenance purposes.
(7) If the air conditioner is installed in a small room or closed room, measures must be taken to prevent the refrig-
erant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. Should the
refrigerant leak and cause the concentration limit to be exceeded, hazards due to lack of oxygen in the room may
result.
(8) Keep gas-burning appliances, electric heaters, and other fire sources (ignition sources) away from the location
where installation, repair, and other air conditioner work will be performed.
If refrigerant comes into contact with a flame, poisonous gases will be released.
(9) When installing or relocating, or servicing the air conditioner, use only the specified refrigerant written on out-
door unit to charge the refrigerant lines.
Do not mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and
may result in an explosion and other hazards.
(10) After installation has been completed, check for refrigerant leaks. If refrigerant leaks into the room and comes
into contact with the flame of a heater or portable cooking range, poisonous gases will be released.
(11) Do not use low temperature solder alloy in case of brazing the refrigerant pipes.
(12) When performing brazing work, be sure to ventilate the room sufficiently. Make sure that there are no hazardous
or flammable materials nearby.
When performing the work in a closed room, small room, or similar location, make sure that there are no refriger-
ant leaks before performing the work.
If refrigerant leaks and accumulates, it may ignite or poisonous gases may be released.
(13) Do not install the unit in places where refrigerant may build-up or places with poor ventilation such as a semi-
basement or a sunken place in outdoor: Refrigerant is heavier than air, and inclined to fall away from the leak
source.
(14) Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manu-
facturer.
(15) The appliance shall be stored in a room without continuously operating ignition sources (for example: open
flames, an operating gas appliance or an operating electric heater).
(16) Do not pierce or burn.
(17) Be aware that refrigerants may not contain an odour.
(18) Pipe-work shall be protected from physical damage.
(19) The installation of pipe-work shall be kept to a minimum.
(20) Compliance with national gas regulations shall be observed.
(21) Keep any required ventilation openings clear of obstruction.
(22) Servicing shall be performed only as recommended by the manufacturer.
(23) The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as
specified for operation.
(24) Maintenance, service and repair operations shall be performed by authorized technician with required qualifica-
tion.
[2] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[3] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A available on the market is a syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

4 5
TCHT011
Unit
Electronic weighing scale
[4] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
3PARTS NAMES AND FUNCTIONS
Emergency operation
switch
Front grille
Air inlet
Filter
Air outlet
Louver
Vane
No. Tool name Specifications
1Gauge manifold · Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 768.7 PSIG [5.3 MPa.G] or over.
2Charge hose · Use pressure performance of 738.2 PSIG [5.09MPa.G] or over.
3Electronic scale —
4Gas leak detector · Use the detector for R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Top of cylinder (R410A refrigerant)
· Cylinder with syphon
8Refrigerant recovery equipment —

6 7
TCHT011
SPECIFICATIONS
4
A
A
kW
F.L.A
dB
Service Ref.
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) × No.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe I.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
TPKA0A0241KA80A
1 phase, 60Hz, 208/230V
15
1
White Munsell 1.0Y 9.2/0.2
Plate fin coil
Line flow fan (direct) × 1
0.069
0.265
Dry: 635-705-775 (18-20-22)
Wet: 635-705-775 (18-20-22)
0(direct blow)
Remote controller & built-in
39-42-45
5/8 (16)
46-1/16 (1170)
11-5/8 (295)
14-3/8 (365)
46 (21)
1 phase, 60Hz, 208/230V
15
1
Plate fin coil
0 (direct blow)
Remote controller & built-in
A
A
kW
F.L.A
dB
Service Ref.
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) × No.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe I.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
TPKA0A0301KA80A
White Munsell 1.0Y 9.2/0.2
0.069
0.265
5/8 (16)
Line flow fan (direct) × 1
Dry: 635-705-775 (18-20-22)
Wet: 635-705-775 (18-20-22)
39-42-45
46-1/16 (1170)
11-5/8 (295)
14-3/8 (365)
46 (21)
A
A
kW
F.L.A
dB
Service Ref.
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) × No.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe I.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
TPKA0A0361KA80A
1 phase, 60Hz, 208/230V
15
1
White Munsell 1.0Y 9.2/0.2
Plate fin coil
Line flow fan (direct) × 1
0.069
0.265
Dry: 705-810-920 (20-23-26)
Wet: 705-810-920 (20-23-26)
0 (direct blow)
Remote controller & built-in
43-46-49
Pa (mmAq)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
lb (kg)
CFM (m3/min)
Pa (mmAq)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
lb (kg)
CFM (m3/min)
Pa (mmAq)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
lb (kg)
CFM (m3/min)
5/8 (16)
46-1/16 (1170)
11-5/8 (295)
14-3/8 (365)
46 (21)

6 7
TCHT011
5NOISE CRITERION CURVES
MAIN UNIT
WALL
3.3 ft
3.3 ft
MICROPHONE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0dB= 0.0002 µ
bar
)
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
NOTCH
Low
49
SPL(dB)
43
LINE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB(0dB=0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
PKA-A24KA
PKA-A30KA
PKA-A24KAL
PKA-A30KAL
High
Low
45
SPL(dB)
39
LINE
NOTCH TPKA0A0361KA80ATPKA0A0241KA80A
TPKA0A0301KA80A

8 9
TCHT011
OUTLINES AND DIMENSIONS
6
Front side
46-1/16(1170)
9-1/2(241)
33-21/32(855)2-29/32(74)
14-3/8(365)
Emergency operation switch
(cooling/heating)
Terminal block for Outdoor unit
Terminal block for
MA-remote controller
Front side(Grille open)
Terminal block for power supply (option)
Filter hook
6-1/16(154)
4-27/32(123)
18-31/32(482)Liquid pipe
17-15/32(444)Gas pipe
Drain hose
5-9/32(134)
Min.9/32(7)
Center measurement hole
[3/32([2.5)
Knockout hole for
rear piping
2-15/16×18-29/32(75×480)
75- [ 3/16( [ 5.1)
Tapping
screw hole
Mount board
Wall hole for
right rear piping
Indoor unit outline
4- [ 11/32( [ 9) Bolt hole
Wall hole for
left rear piping
1/8(3)
R1-15/32(R37.5)
2-1/8(54) 0
5/8(15.5)
0
17-9/32(439) 0
17-9/32(439)
15-1/8(384)
13/32(10) 20-3/8(517.4) 17-7/8(454) 16-3/32(408.5) 15-1/8(384) 14-11/32(364) 12-3/8(314) 4-11/32(110) 2-3/8(60) 13/32(10) 18-5/16(465.5) 17-7/8(454)
16-3/32(408.5)
15-1/8(384.5) 14-11/32(364) 12-3/8(314) 4-11/32(110) 2-3/8(60)
1-1/4(32)
12-5/32(308.5)
31/32(25)
11-1/2(292)
11(279.5)
9-17/32(242)
7-9/16(192)
5-19/32(142)
4-29/32(125)
4-19/32(117)
3-15/16(100)
2-15/16(75)
1-31/32(50)
15-1/8(384)
0
13-3/4(349.2)
16-15/16(430.5)
1/2(12.5)
11-1/2(292)
10-13/32(264)
9-1/32(229.5)
8-17/32(217)
6-9/16(167)
5-3/32(129.5)
4-1/8(104.5)
3-7/16(87.5)
2-15/32(62.5)
1-15/32(37.5)
1/2(12.5)
2-1/8(54)
31/32(25)
0
12-1/4(311)
8-17/32(216.5)
13-11/32(339)
20-7/8(530.5)
7-7/16(189)
13-11/32(339)
17-11/16(449.2)
23-1/32(585)
23-1/32(585)
A
5/16(7.8)
3-1/32(77)
2-5/8(67)
2-9/16(65)
B
Knockout hole for piping
13/32(10.7)
2-9/16(65)
3-1/32(77)
3-7/16(87)
C
5/16(7.8)
2-9/16(65)
3-1/32(77)
2-5/8(67)
Louver(manual)
Vane(auto)
Knockout hole
for lower piping
Under side
BB
Receiver
DEFROST/STAND BY lamp
Operation lamp
2-19/32(66)
23/32(18)
1-1/4(32)
2-3/32(53)
1-3/16(30)
1-3/8(35)
Mount board
C
Knockout hole
for right piping
Right side
11-5/8(295) 3/16(5)
Left side
A
Knockout hole
for left piping
Top side
2-9/16(65.2)
5-17/32(140.3)
7/16(11)
17(431.7)16-11/16(423.7)
Air outlet
Air inlet
Min.1-7/8(48)
Min.9-27/32(250)
Required space(Indoor unit)
Min.3-31/32(100.5)
Min.8-21/32(220)
Min.2-1/16(52.3)
32
1
Refrigerant pipe: 3/8 O.D([9.52)
Refrigerant pipe: 5/8 O.D([15.88)
5/8([16) O.D
3Drain hose
Piping connection
1Liquid pipe
2Gas pipe
Through hole
[2-15/16
([75) [2-15/16~[3-5/32
([75~[80)
Sleeve
(purchased locally) Flared connection: 5/8F
Flared connection: 3/8F
Effective length: 23-1/32 (585)
TPKA0A0241KA80A TPKA0A0301KA80A TPKA0A0361KA80A Unit: inch (mm)

8 9
TCHT011
WIRING DIAGRAM
7
TPKA0A0241KA80A TPKA0A0301KA80A TPKA0A0361KA80A
NOTES:
1.Symbols used in wiring diagram on the left are,
2.Indoor and outdoor connecting wires are made with
3.Since the outdoor side electric wiring may change,
4.This diagram shows the wiring of indoor and outdoor
polarities, make wiring matching terminal numbers
(S1, S2, S3).
be sure to check the outdoor unit electric wiring for servicing.
connecting wires (specification of 208V/230V),
adopting superimposed system of power and signal.
For power supply system of this unit, refer to the
Utiliser des fils d’alimentation en cuivre.
* 1: Use copper supply wires.
caution label located near this diagram.
, :Connector.
:Terminal (block),
TO
OUTDOOR
UNIT
*1
TB4
OG
S2
S1
S3
CN4F and fit the drain float switch (FS).
FS
When attaching drain pump (option)
“ Turn it off when a remote controller other than
PAR-4*MAAU/CT01MAU is connected”
FLOAT SW
CN4F (WH) 4 1
When attaching drain pump(option), remove the jumper connector
<Fig. 1>
The black square ( ) indicates a switch position.
MODELS SW2
024
ON
OFF
1 2 3 4 5 6
MODELS SW2
036
ON
OFF
1 2 3 4 5 6
030
ON
OFF
1 2 3 4 5 6
OG
BN
BK
1
1 3
3 1
1 4
5
3
DP
MS
3~
3
3 1
33
6
9
TH1
t° t° t°
TH2 TH5
SWE1
CNMF
(WH)
CN01
(BK)
CN3C
FUSE
(BU) CN44
(WH)
3 1
1
21 1 5 1
1123456 123456
See Fig. 1
SW1
J41
1
2
3
4
5
6
7
8
ONOFF
SW5 5
3216
15 1
1
1 9
1 10
2
1
2
2
2
M
MV
LED2
J42
SW2
3
4
5
14
CNP
CN41(WH)
CN51(WH)
CN105(RD)
LED1
LED3
(WH)
CNV
(WH)
CN20
(RD)
CN90
(WH)
CN303
(WH)
CN22
BZ1
TB5
2
1
(RD)
CNRU
(WH)
CN301
REC1
LED1 LED2
(GN)
CN2L
(RD) CN4F
(WH)
CN32
ON
OFF ON OFF
(WH)
SWE
ON OFF
4 7
MS
MF
I.B
D.P
S.B W.B
D.P
3~
YE
(DRAIN PUMP (OPTION))
POWER SUPPLY
DRAIN PUMP (OPTION)
CONNECTOR
FUSE (T3.15AL250V)
POWER SUPPLY (I.B)
TRANSMISSION (INDOOR-OUTDOOR)
POWER SUPPLY (REMOTE CONTROLLER)
BUZZER
INDOOR CONTROLLER BOARD
[LEGEND]
SYMBOL NAME
I.B MV VANE MOTOR
TERMINAL BLOCK
THERMISTOR
SWITCH BOARD
EMERGENCY OPERATION
PCB FOR WIRELESS RECEIVER
RECEIVING UNIT
DRAIN PUMP KIT
DRAIN FLOAT SWITCH
DRAIN PUMP
LED (OPERATION INDICATION : GREEN)
LED (PREPARATION FOR HEATING : ORANGE)
TB4 INDOOR/OUTDOOR
CONNECTING LINE
REMOTE CONTROLLERTB5
TH1
S.B
SWE1
REC1
LED1
LED2
FS
DP
W.B
D.P
BZ1
CNP
CN2L LOSSNAY
CN32 REMOTE SWITCH
HA TERMINAL-ACN41
CN4F
CN51
CN90
FUSE
LED1
LED2
LED3
SW1 SWITCH
FAN MOTOR
MODEL SELECTION
CAPACITY CODE
FUNCTION SETTING
FAN-DRAIN PUMP (TEST MODE)
SW2
SW5
SWE
MF
CN105
SYMBOL NAME
DRAIN FLOAT SWITCH
(DRAIN PUMP (OPTION))
CENTRALLY CONTROL
IT TERMINAL
REMOTE OPERATION ADAPTER
ROOM TEMP. DETECTION
(0°C / 15kΩ, 25°C / 5. 4kΩ)
(32°F / 15kΩ, 77°F / 5. 4KΩ)
TH2
PIPE TEMP. DETECTION/LIQUID
(0°C / 15kΩ, 25°C / 5. 4kΩ)
(32°F / 15kΩ, 77°F / 5. 4KΩ)
TH5
COND. / EVA. TEMP.DETECTION
(0°C / 15kΩ, 25°C / 5. 4kΩ)
(32°F / 15kΩ, 77°F / 5. 4KΩ)

10 11
TCHT011
REFRIGERANT SYSTEM DIAGRAM
8
Pipe temperature thermistor/liquid
(TH2)
Distributor
with strainer (#50/#100)
Condenser/evaporator
temperature thermistor
(TH5)
Room temperature
thermistor (TH1)
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer (#50)
Strainer (#50)
Heat exchanger
Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
TPKA0A0241KA80A TPKA0A0301KA80A TPKA0A0361KA80A

10 11
TCHT011
TROUBLESHOOTING
9
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the wired remote controller and control board of out-
door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
9-1. TROUBLESHOOTING
Unit conditions at service Check code Actions to be taken for service (summary)
The trouble is reoccurring.
Displayed Judge the problem and take a corrective action according
to “9-3. SELF-DIAGNOSIS ACTION TABLE”.
Not displayed
Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING OF
PROBLEMS”.
The trouble is not reoccurring.
Logged
1 Consider the temporary defects such as the work of protection
devices in the refrigerant circuit including compressor, poor
connection of wiring, noise, etc.
Re-check the symptom, and check the installation environ-
ment, refrigerant amount, weather when the trouble occurred,
matters related to wiring, etc.
2
Reset check error code logs and restart the unit after finishing service.
3There is no abnormality in electrical component,
controller board, remote controller, etc.
Not logged
1 Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the trouble
according to “9-4. TROUBLESHOOTING OF PROBLEMS”.
3 Continue to operate unit for the time being if the cause is not
ascertained.
4 There is no abnormality concerning of parts such as electrical
component, controller board, remote controller, etc.

12 13
TCHT011
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
OPERATION
INDICATOR
lamp blink
pattern
peeBpeeBpeeBpeeBpeeB Beep Beep
Off
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
Off
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1
st
2
nd
3
rd
1
st
2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
[Output pattern B]
OPERATION
INDICATOR
lamp blink
pattern
Beep Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
Off
Approx. 2.5 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1
st
2
nd
3
rd
1
st
2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
• Refer to “13-7. SELF-DIAGNOSIS” to search for the error history.
[Output pattern A]
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wireless remote controller Wired remote controller
Symptom Remarks
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1 E9 Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
For details, check the LED
display of the outdoor
controller board.
As for outdoor unit, refer
to outdoor unit's service
manual.
2 UP Compressor overcurrent interruption
3 U3,U4 Open/short of outdoor unit thermistors
4 UF Compressor overcurrent interruption (When compressor locked)
5 U2 Abnormal high discharge temperature/49C operated/
insufcient refrigerant
6 U1,Ud (UD)* Abnormal high pressure (63H operated)/Overheating
protection operation
7 U5 Abnormal temperature of heat sink
8 U8 Outdoor unit fan protection stop
9 U6 Compressor overcurrent interruption/Abnormal of power module
10 U7 Abnormality of super heat due to low discharge temperature
11 U9,UH Abnormality such as overvoltage or voltage shortage and abnormal
synchronous signal to main circuit/Current sensor error
12 - -
13 - -
14 Others Other errors (Refer to the technical manual for the outdoor unit.)
Notes:
1. If the beeper does not sound again after the initial 2 beeps to conrm the self-check start signal was received and the OPERATION INDICATOR lamp
does not come on, there are no error records.
2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 seconds)” after the initial 2 beeps to conrm the self-check start signal
was received, the specied refrigerant address is incorrect.
[Output pattern A] Errors detected by indoor unit
Wireless remote controller Wired remote controller
Symptom Remarks
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1 P1 Intake sensor error
2P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
3 E6,E7 Indoor/outdoor unit communication error
4 P4 Drain sensor error/Float switch connector (CN4F) open
5P5 Drain pump error
PA Forced compressor stop(due to water leakage abnormality)
6 P6 Freezing/Overheating protection operation
7 EE Combination error between indoor and outdoor units
8 P8 Pipe temperature error
9 E4, E5 Remote controller signal receiving error
10 – –
11 Pb Indoor unit fan motor error
12 Fb (FB)* Indoor unit control system error (memory error, etc.)
14 PL Abnormal refrigerant circuit
No sound E0, E3 Remote controller transmission error
No sound E1, E2 Remote controller control board error
No sound – – – – No corresponding

12 13
TCHT011
• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• On wired remote controller
Check code displayed in the LCD. (Refer to the previous page, 1check code.)
● If the unit cannot be operated properly after test run, refer to the following table to nd the cause.
Symptom Cause
Wired remote controller LED 1, 2 (PCB in outdoor unit)
Please Wait For about 3
minutes after
power-on
After LED 1, 2 are lit, LED 2 is turned
off, then only LED 1 is lit.
(Correct operation)
• For about 3 minutes following power-on, operation
of the remote controller is not possible
due to system startup. (Correct operation)
Please Wait → Check code
Subsequent to
about 3 minutes
after power-on
Only LED 1 is lit.
→ LED 1, 2 blink.
• Connector for the outdoor unit’s protection device
is not connected.
• Reverse or open phase wiring for the outdoor
unit’s power terminal block (L1, L2, GR).
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
Only LED 1 is lit.
→ LED 1 blinks twice,
LED 2 blinks once.
• Incorrect wiring between indoor and outdoor units
(incorrect polarity of S1, S2, S3)
• Remote controller wire short
On the wireless remote controller with condition above, following phenomena take place.
• No signals from the remote controller can be received.
• Operation lamp is blinking.
• The buzzer makes a short ping sound.
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
LED1 (power for microprocessor) Indicates whether control power is supplied. Make sure that this LED is
always lit.
LED2 (power for remote controller) Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant addresses “0”.
LED3 (communication between indoor and outdoor units) Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.

14 15
TCHT011
9-3. SELF-DIAGNOSIS ACTION TABLE
Note:
Errors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7),
are not covered in this document. Please refer to the outdoor unit service manual for the details.
Check code Abnormal point and detection method Cause Countermeasure
P1
Room temperature thermistor (TH1)
1The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 min-
utes. (The unit returns to normal opera-
tion, if it has been reset normally.)
2Constantly detected during cooling,
drying, and heating operation.
Short: 194°F [90:] or more
Open: −40°F [−40:] or less
1Defective thermistor
characteristics
2Contact failure of connector
(CN20) on the indoor controller
board (Insert failure)
3Breaking of wire or contact
failure of thermistor wiring
4Defective indoor controller
board
1–3Check resistance value of thermistor.
32°F [0:]....15.0 k"
50°F [10:]......9.6 k"
68°F [20:]......6.3 k"
86°F [30:]......4.3 k"
104°F [40:]......3.0 k"
If you put force on (draw or bend) the lead
wire with measuring resistance value of
thermistor, breaking of wire or contact fail-
ure can be detected.
2Check contact failure of connector (CN20)
on the indoor controller board. Refer to
"9-7. TEST POINT DIAGRAM".
Turn the power on again and check
restart after inserting connector again.
4Check room temperature display on
remote controller.
Replace indoor controller board if there
is abnormal difference with actual room
temperature.
Turn the power off, and on again to operate after check.
P2
Pipe temperature thermistor/liquid (TH2)
1The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 min-
utes. (The unit returns to normal opera-
tion, if it has been reset normally.)
2Constantly detected during cooling,
drying, and heating (except defrosting)
operation
Short: 194°F [90:] or more
Open: −40°F [−40:] or less
1Defective thermistor
characteristics
2Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3Breaking of wire or contact
failure of thermistor wiring
4Defective refrigerant circuit is
causing thermistor temperature
of 194°F [90:] or more, or
−40°F [−40:] or less.
5Defective indoor controller
board
1–3Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2Check contact failure of connector (CN44)
on the indoor controller board. Refer to
"9-7. TEST POINT DIAGRAM".
Turn the power on and check restart
after inserting connector again.
4Check pipe <liquid> temperature with
remote controller in test run mode. If pipe
<liquid> temperature is extremely low (in
cooling mode) or high (in heating mode),
refrigerant circuit may have defective.
5Check pipe <liquid> temperature with
remote controller in test run mode. If
there is extremely difference with actual
pipe <liquid> temperature, replace indoor
controller board.
Turn the power off, and on again to operate
after check.
P4
Contact failure of drain float switch
(CN4F)
• Extract when the connector of drain float
switch is disconnected.
(3and 4of connector CN4F is not
short-circuited.)
• Constantly detected during operation
1Contact failure of connector
(Insert failure)
2Defective indoor controller
board
1 Check contact failure of float switch connector.
Turn the power on again and check after insert-
ing connector again.
2Operate with connector (CN4F) short-
circuited.
Replace indoor controller board if abnor-
mality reappears.
P5
Drain over flow protection operation
1Suspensive abnormality, if drain float
switch is detected to be underwater for 1
minute and 30 seconds continuously with
drain pump on.
Compressor and indoor fan will be turned
off.
2Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.
3Constantly detected during drain pump
operation
1Malfunction of drain pump
2Defective drain
Clogged drain pump
Clogged drain pipe
3Defective drain float switch
Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)
4Defective indoor-controller
board
1Check if drain-up machine works.
2Check drain function.
3Remove drain float switch connector
CN4F and check if it is short (Switch On)
with the moving part of float switch UP,
or OPEN with the moving part of float
switch down.
Replace float switch if it is short with the
moving part of float switch down.
4Replace indoor controller board if it is
short-circuited between 3–4of the drain
float switch connector CN4F and abnor-
mality reappears.
I t is not abnormal if there is no problem about
the above-mentioned 1–4.
Turn the power off, and on again to operate after check.

14 15
TCHT011
Check code Abnormal point and detection method Cause Countermeasure
P6
Freezing/overheating protection is work-
ing
1Freezing protection (Cooling mode)
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−5°F [−15:] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −5°F [−15:]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
2Overheating protection (Heating mode)
The unit is in 6-minute resume
prevention mode if pipe <liquid or con-
denser/evaporator> temperature is
detected as over 158°F [70:] after the
compressor started. Abnormal if the tem-
perature of over 158°F [70:] is detected
again within 30 minutes after 6-minute
resume prevention mode.
(Cooling or drying mode)
1Clogged filter (reduced airflow)
2Short cycle of air path
3Low-load (low temperature)
operation out of the tolerance
range
4Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5Defective outdoor fan control
6Overcharge of refrigerant
7Defective refrigerant circuit
(clogs)
(Heating mode)
1Clogged filter (reduced airflow)
2Short cycle of air path
3Over-load (high temperature)
operation out of the tolerance
range
4Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5Defective outdoor fan control
6Overcharge of refrigerant
7Defective refrigerant circuit
(clogs)
8Bypass circuit of outdoor unit is
defective.
(Cooling or drying mode)
1Check clogs of the filter.
2Remove shields.
4Refer to "9-6. HOW TO CHECK THE
PARTS".
5Check outdoor fan motor.
67 Check operating condition of refriger-
ant
circuit.
(Heating mode)
1Check clogs of the filter.
2Remove shields.
4Refer to "9-6. HOW TO CHECK THE
PARTS".
5Check outdoor fan motor.
6–8Check operating condition of refriger-
ant circuit.
P8
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe tem-
perature is not in the cooling range 3 min-
utes after compressor start and 6 minutes
after the liquid or condenser/evaporator
pipe is out of cooling range.
Note 1: It takes at least 9 minutes to detect.
Note 2: Abnormality P8 is not detected in
drying mode.
Cooling range: −5.4°F [−3°C] ] (TH−TH1)
TH: Lower temperature between liquid pipe
temperature (TH2) and condenser/
evaporator temperature (TH5)
TH1: Intake temperature
<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in heat-
ing range within 20 minutes.
Note 3: It takes at least 27 minutes to
detect abnormality.
Note 4: It excludes the period of defrosting.
(Detection restarts when defrosting
mode is over.)
Heating range: 5.4°F [3°C] [ (TH5−TH1)
1Slight temperature difference
between indoor room
temperature and pipe <liquid
or condenser/evaporator>
temperature thermistor
• Shortage of refrigerant
• Disconnected holder of pipe
<liquid or condenser/
evaporator> thermistor
• Defective refrigerant circuit
2Converse connection of
extension pipe (on plural units
connection)
3Converse wiring of indoor/
outdoor unit connecting wire (on
plural units connection)
4Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
5Stop valve is not opened
completely.
1–4 Check pipe <liquid or condenser/
evaporator> temperature with room
temperature display on remote con-
troller and outdoor controller circuit
board.
Pipe <liquid or condenser/evapora-
tor> temperature display is indicated
by setting SW2 of outdoor controller
circuit board as follows.
Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool(PAC-SK52ST)’.
23Check converse connection of exten-
sion pipe or converse wiring of indoor/
outdoor unit connecting wire.
( (

16 17
TCHT011
Check code Abnormal point and detection method Cause Countermeasure
P9
Condenser/evaporator temperature ther-
mistor (TH5)
1The unit is in 3-minute resume protec-
tion mode if short/open of thermistor is
detected. Abnormal if the unit does not
get back to normal within 3 minutes. (The
unit returns to normal operation, if it has
been reset normally.)
2Constantly detected during cooling,
drying, and heating operation (except
defrosting)
Short: 194°F [90:] or more
Open: −40°F [−40:] or less
1Defective thermistor
characteristics
2Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3Breaking of wire or contact
failure of thermistor wiring
4Temperature of thermistor is
194°F [90:] or more or −40°F
[−40:] or less caused by
defective refrigerant circuit.
5Defective indoor controller
board
1–3
Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2Check contact failure of connector (CN44)
on the indoor controller board.
Refer to "9-7. TEST POINT DIAGRAM".
Turn the power on and check restart
after inserting connector again.
4
Operate in test run mode and check pipe
<condenser/evaporator> temperature with
outdoor controller circuit board. If pipe
<condenser/evaporator> temperature is
extremely low (in cooling mode) or high (in
heating mode), refrigerant circuit may have
defect.
5 Operate in test run mode and check pipe
<condenser/evaporator> temperature with
outdoor control circuit board. If there is
extreme difference with actual pipe
<condenser/evaporator> temperature, replace
indoor controller board.
There is no abnormality if none of above
comes within the unit.
Turn the power off and on again to operate.
In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service
tool (PAC-SK52ST).
PA
Forced compressor stop
(due to water leakage abnormality)
1The unit has a water leakage abnormality
when the following conditions, a) and b),
are satisfied while the above-mentioned
detection is performed.
a) The intake temperature subtracted with
liquid pipe temperature detects to be
less than 14°F [−10°C] for a total of
30 minutes. (When the drain sensor
is detected to be NOT soaked in the
water, the detection record of a) and b)
will be cleared.)
b) Drain float switch detects to be in the
water for more than 15 minutes.
Note:
Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
1Drain pump trouble
2Drain defective
· Drain pump clogging
· Drain pipe clogging
3Open circuit of float switch
4
Contact failure of float switch connector
5Dew condensation on float switch
· Drain water descends along
lead wire.
· Drain water is waving due to
filter clogging.
6Extension piping connection dif-
ference at twin, triple or quadru-
ple system
7Miswiring of indoor/outdoor con-
necting at twin, triple or quadru-
ple system
8Room temperature thermistor/
liquid pipe temperature thermis-
tor detection is defective.
1Check the drain pump.
2Check whether water can be drained.
3Check the resistance of the float switch.
4Check the connector contact failure.
5Check the float switch leadwire mounted.
Check the filter clogging.
6Check the piping connection.
7 Check the indoor/outdoor connecting wires.
8Check the room temperature display of
remote controller.
Check the indoor liquid pipe temperature
display of outdoor controller board.
PB (Pb)
Fan motor trouble 1 Defective fan motor
2 Defective indoor controller board
3
Contact failure of fan motor connector
1-3 Refer to "9-6-2. DC fan motor (fan
motor/indoor controller circuit board".
E0
or
E4
Remote controller transmission
error(E0)/signal receiving error(E4)
1Abnormal if main or sub remote con-
troller cannot receive any transmission
normally from indoor unit of refrigerant
address “0” for 3 minutes.
(Check code: E0)
2Abnormal if sub remote controller could
not receive any signal for 2 minutes.
(Check code: E0)
1Abnormal if indoor controller board can
not receive any data normally from
remote controller board or from other
indoor controller board for 3 minutes.
(Check code: E4)
2Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Check code: E4)
1Contact failure at transmission
wire of remote controller
2All remote controllers are set as
“sub” remote controller. In this
case, E0 is displayed on remote
controller, and E4 is displayed
at LED (LED1, LED2) on the
outdoor controller circuit board.
3Miswiring of remote controller
4Defective transmitting receiving
circuit of remote controller
5Defective transmitting receiving
circuit of indoor controller board
of refrigerant addresses “0”.
6Noise has entered into the
transmission wire of remote
controller.
1 Check disconnection or looseness of indoor unit or
transmission wire of remote controller.
2 Set one of the remote controllers “main”
if there is no problem with the action above.
3Check wiring of remote controller.
• Total wiring length: max. 500 m
(Do not use cable x 3 or more.)
•
The number of connecting indoor units: max. 16 units
• The number of connecting remote con-
troller: max. 2 units
If the cause of trouble is not in above 1–3,
4Diagnose remote controllers.
a) When “OK” is displayed,
Remote controllers have no problem.
Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
b) When “NG” is displayed,
Replace remote controller.
c)
When “E3” or “ERC” is displayed, noise may be
causing abnormality.
Note: If the unit is not normal after replacing indoor
controller board in group control, indoor control-
ler board of address “0” may be abnormal.
( (

16 17
TCHT011
Check code Abnormal point and detection method Cause Countermeasure
E3
or
E5
Remote controller transmission
error(E3)/signal receiving error(E5)
1Abnormal if remote controller could not
find blank of transmission path for 6 sec-
onds and could not transmit.
(Check code: E3)
2Remote controller receives transmitted
data at the same time and compares the
received and transmitted data. Abnormal
if these data are judged to be different
30 continuous times. (Check code: E3)
1Abnormal if indoor controller board could
not find blank of transmission path.
(Check code: E5)
2
Indoor controller board receives transmitted
data at the same time and compares the
received and transmitted data. Abnormal
if these data are judged to be different 30
continuous times. (Check code: E5)
12 remote controllers are set as
“main.”
(In case of 2 remote con-
trollers)
2Remote controller is connected
with 2 indoor units or more.
3Repetition of refrigerant
address
4Defective transmitting receiving
circuit of remote controller
5Defective transmitting receiving
circuit of indoor controller board
6
Noise has entered into transmis-
sion wire of remote controller.
1Set a remote controller to main, and the
other to sub.
2Remote controller is connected with only
one indoor unit.
3
The address changes to a separate setting.
4–6 Diagnose remote controller.
a) When “OK” is displayed, remote con-
trollers have no problem.
Turn the power off,and on again to
check.
When becoming abnormal again,
replace indoor controller board.
b) When “NG” is displayed, replace
remote controller.
c)
When “E3” or “ERC” is displayed,
noise may be causing abnormality.
E6
Indoor/outdoor unit communication
error (Signal receiving error)
1Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
2Abnormal if indoor controller board
cannot receive any signal normally for 3
minutes.
3Consider the unit abnormal under the fol-
lowing condition: When 2 or more indoor
units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for 3 minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.
1Contact failure, short circuit or,
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2Defective transmitting receiving
circuit of indoor controller board
3Defective transmitting receiving
circuit of indoor controller board
4Noise has entered into indoor/
outdoor unit connecting wire.
Check LED display on the outdoor control
circuit board. (Connect A-control service
tool, PAC-SK52ST.)
Refer to outdoor unit service manual.
1 Check disconnection or looseness of
indoor/ outdoor unit connecting wire of
indoor unit or outdoor unit.
Check all the units in case of twin triple
indoor unit system.
2–4Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board or out-
door controller circuit board.
Note: Other indoor controller board may
have defect in the case of twin triple
indoor unit system.
E7
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.
1Defective transmitting receiving
circuit of indoor controller board
2Noise has entered into power
supply.
3Noise has entered into outdoor
control wire.
1–3Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
FB (Fb)
Indoor controller board
Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.
1Defective indoor controller
board
1Replace indoor controller board.
E1
or
E2
Remote controller control board
1Abnormal if data cannot be read nor-
mally from the nonvolatile memory of the
remote controller control board.
(Check code: E1)
2Abnormal if the clock function of remote
controller cannot be operated normally.
(Check code: E2)
1Defective remote controller 1Replace remote controller.
*The check code in the parenthesis indicates
TAR-41MAA model.
PL
Abnormal refrigerant circuit
During Cooling, Drying, or Auto Cooling
operation, the following conditions are
regarded as failures when detected for 1
second.
a)The compressor continues to run for 30
or more seconds.
b)The liquid pipe temperature or the
condenser/evaporator temperature is
167°F [75°C] or more.
These detected errors will not be
cancelled until the power source is
reset.
Abnormal operation of 4-way
valve
Disconnection of or leakage in
refrigerant pipes
Air into refrigerant piping
Abnormal operation (no rotation)
of indoor fan
· Defective fan motor
· Defective indoor control board
Defective refrigerant circuit
(clogging)
When this error occurs, be sure to
replace the 4-way valve.
Check refrigerant pipes for disconnection
or leakage.
After the recovery of refrigerant, vacuum
dry the whole refrigerant circuit.
Refer to "9-6-2. DC fan motor (fan motor/
indoor controller circuit board".
Check refrigerant circuit for operation.
To avoid entry of moisture or air
into refrigerant circuit which could
cause abnormal high pressure, purge
air in refrigerant circuit or replace
refrigerant.

18 19
TCHT011
9-4. TROUBLESHOOTING OF PROBLEMS
Note: Refer to the outdoor unit's service manual for the detail of remote controller.
Phenomena Cause Countermeasure
(1)LED2 on indoor controller board
is off.
• When LED1 on indoor controller board is also off.
Power supply of rated voltage is not supplied to out-
door unit.
Defective outdoor controller circuit board
Power supply of 208/230 V is not supplied to indoor
unit.
Defective indoor controller board
Check the voltage of outdoor power
supply terminal block (L1, L2).
• When 208/230 V AC is not detected,
check the power wiring to outdoor unit
and the breaker.
• When 208/230 V AC is detected, check
(below).
Check the voltage between outdoor
terminal block S1 and S2.
• When 208/230 V AC is not detected,
—check the fuse on outdoor controller
circuit board.
—check the wiring connection.
• When 208/230 V AC is detected, check
(below).
Check the voltage between indoor termi-
nal block S1 and S2.
• When 208/230 V AC is not detected,
check indoor/outdoor unit connecting
wire for miswiring.
• When 208/230 V AC is detected,
check (below).
Check the fuse on indoor controller board.
Check the wiring connection.
If no problem is found, indoor controller
board is defective.
• When LED1 on indoor controller board is lit.
Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant
address “0”.)
Check again the setting of refrigerant
address for outdoor unit.
Set the refrigerant address to “0”.
(For grouping control system under
which 2 or more outdoor units are
connected, set one of the units to “0”.)
Set refrigerant address using SW1 (3-6)
on outdoor controller circuit board.
(2)LED2 on indoor controller board
is blinking.
• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting
wire
• When LED1 is lit.
Miswiring of remote controller wires
Under twin or triple indoor unit system, 2 or more
indoor units are wired together.
Refrigerant address for outdoor unit is wrong or not
set.
Under grouping control system, there are some units
whose refrigerant addresses are 0.
Short-circuit of remote controller wires
Defective remote controller
Check indoor/outdoor unit connecting
wire for connection failure.
Check the connection of remote con-
troller wires in case of twin triple indoor
unit system. When 2 or more indoor units
are wired in one refrigerant system,
connect remote controller wires to one of
those units.
Check the setting of refrigerant address in
case of grouping control system.
If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.
Remove remote controller wires and
check LED2 on indoor controller board.
• When LED2 is blinking, check the short-
circuit of remote controller wires.
• When LED2 is lit, connect remote
controller wires again and:
if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block, etc. has returned to normal.

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TCHT011
Note: Refer to the outdoor unit's service manual for the detail of remote controller.
Phenomena Cause Countermeasure
(3)Upward/downward vane
performance failure
The vane is not downward during defrosting and heat
preparation and when the thermostat is OFF in HEAT
mode. (Working of COOL protection function)
Vane motor does not rotate.
• Defective vane motor
• Breaking of wire or connection failure of connector
Upward/downward vane does not work.
• The vane is set to fixed position.
Normal operation (The vane is set to hori-
zontal regardless of remote control.)
Check (left).
• Check the vane motor. (Refer to 9-6.
HOW TO CHECK THE PARTS.)
• Check for breaking of wire or connection
failure of connector.
Normal operation (Each connector on
vane motor side is disconnected or setting
the fixed vanes by wired remote
controller.)
(4)Receiver for wireless remote
controller
Weak batteries of wireless remote controller
Contact failure of connector (CNB) on wireless remote
controller board (Insert failure)
Contact failure of connector (CN90) on indoor control-
ler board (Insert failure)
Contact failure of connector between wireless remote
controller board and indoor controller board
Replace batteries of wireless remote con-
troller.
Check contact failure of each connector.
If no problems are found of connector,
replace indoor controller board.
When the same trouble occurs even if
indoor controller board is replaced,
replace wireless remote controller
board.

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TCHT011
9-5. EMERGENCY OPERATION
9-5-1. When wireless remote controller fails or its battery is exhausted
9-5-2. When wired remote controller or indoor unit microprocessor fails
When the remote controller cannot be used
ADEFROST/STAND BY lamp (ORANGE)
BOperation lamp (GREEN)
CEmergency operation switch (cooling/heating)
DReceiver
[Heat pump type]
[Cooling Only type]
Operation Monitor Display
GREEN ORANGE
STOP
COOL
HEAT
OFF ON
Details of emergency mode are as shown below.
Operation Mode
Set Temperature
Fan Speed
COOL HEAT
75°F [24°C] 75°F [24°C]
High High
Airflow Direction Up and Down Horizontal
Cooling Heating Stop
Cooling Stop
•Each press of the emergency operation switch will toggle the
operation mode.
•Check “COOL/HEAT” with the operation monitor display. (The display will
appear orange for 5 seconds after pressing the emergency operation switch.)
Downward
When the batteries of the remote controller run out or the remote controller
malfunctions, the emergency operation can be done using the emergency
buttons.
The orange lamp follows the switch operation
as indicated at the left for 5 sedonds, and
then it will return to the normal display.
B
A
D
C
1. When the wired remote control or the indoor unit microcomputer has failed, but all other components work properly,
if you set the switch (SWE) on the indoor controller board ON, the indoor unit will begin Emergency Operation.
When Emergency Operation is activated, the indoor unit operates as follows:
(1) Indoor fan is running at high speed. (2) Drain pump is working. (option)
*Note on the wireless remote control:
When the remote control does not function, it is possible to activate Emergency Operation by using the indoor unit
Emergency Operation switch.
However, if the indoor unit microprocessor has failed, it is necessary to proceed with points 2 and 3 below as in the
case of the wired remote control.
2. When you activate Emergency Operation of the cooling or heating, you have to set the switch (SWE) on the indoor
controller board and activate Emergency Operation of the outdoor unit.
For details on how to activate Emergency Operation of the outdoor unit, refer to the outdoor unit wiring diagram.
3. Before you activate Emergency Operation, check the following points:
(1) Emergency operation cannot be activated when:
• the outdoor unit malfunctions. • the indoor fan malfunctions.
• when it has detected the malfunction of drain pump during self-diagnosing.
(2) Emergency Operation becomes continuous only by switching the power source on/off.
ON/OFF on the remote control or temperature control etc. does not function.
(3) Avoid operating for a long time when the outdoor unit begins defrosting while Emergency Operation of the heating is
activated, because it will start to blow cold air.
(4) Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5) After Emergency Operation has been deactivated, set the switches etc. to their original positions.
(6) Movement of the vanes does not work in Emergency Operation, therefore you have to slowly set them manually
to the appropriate position.