Mitsubishi Electric TRANE TPKA0A0121HA70A User manual

SERVICE MANUAL
TPKA0A0121HA70A
TPKA0A0181HA70A
Indoor unit
[Model Name]
September 2019
No. OCHT637
CONTENTS
1. REFERENCE MANUAL................................... 2
2. SAFETY PRECAUTION................................... 3
3. PARTS NAMES AND FUNCTIONS................. 4
4. SPECIFICATIONS...........................................12
5. NOISE CRITERION CURVES.........................13
6. OUTLINES AND DIMENSIONS...................... 14
7. WIRING DIAGRAM.........................................15
8. REFRIGERANT SYSTEM DIAGRAM............ 16
9. TROUBLESHOOTING....................................17
10. FUNCTION SETTING.....................................31
11. SPECIAL FUNCTION .....................................32
12. DISASSEMBLY PROCEDURE.......................36
PARTS CATALOG (OCBT637)
INDOOR UNIT
WIRED REMOTE
CONTROLLER
(Option)
IR WIRELESS REMOTE
CONTROLLER (Option)
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
MENU ON
OFF
RETURN SELECT
HOLD

2
OCHT637
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
Model Name Service Manual No.
TRUZA0121KA70NA
TRUZA0181KA70NA
TRUYA0121KA70NA
TRUYA0181KA70NA
TRUZA0121KA70BA
TRUZA0181KA70BA
TRUZA0121KA70BA
TRUZA0181KA70BA
OCHT636
OCBT636
Wired remote controller IR wireless remote controller
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
Remote controller (Optional parts)
MENU ON
OFF
RETURN SELECT
HOLD

OCHT637 3
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.
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.
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.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazards to refrigerant cycle.
In addition, use pipes with specified thickness.
Store the piping indoors, and 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.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Use the specified refrigerant only.
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.

4
OCHT637
Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 768.7 PSIG [5.3 MPa.G] or over.
2Charge hose · Only for R410A
· Use pressure performance of 738.2 PSIG [5.09 MPa.G] or over.
3Electronic weighing scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
[1] 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) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
3PARTS NAMES AND FUNCTIONS
3-1. Indoor unit
Filter Air intake
Louver Air outlet Vane

5
OCHT637
3-2. Wired Remote Controller <TAR-40MAA>
Function buttons
MENU
ON
OFF
RETURN SELECT
HOLD
When the backlight is off, pressing any button turns the backlight on
and does not perform its function. (except for the [ON/OFF] button)
The functions of the function buttons change depending on the
screen.
Refer to the button function guide that appears at the bottom of
the LCD for the functions they serve on a given screen.
When the system is centrally controlled, the button function
guide that corresponds to the locked button will not appear.
Press to turn ON/OFF the indoor unit.
This lamp lights up in green while the unit is in operation. It blinks
while the remote controller is starting up or when there is an error.
1[ON/OFF] button 6ON/OFF lamp
Press to save the setting.
When the Main menu is displayed, pressing this button will
enable/disable the HOLD function.
Main display: Press to change the operation mode.
Menu screen: The button function varies with the screen.
2 [SELECT/HOLD] button
7 Function button [F1]
Press to return to the previous screen. Main display: Press to decrease temperature.
Main menu: Press to move the cursor left.
Menu screen: The button function varies with the screen.
3[RETURN] button 8Function button [F2]
4[MENU] button
9Function button [F3]
Press to bring up the Main menu.
Main display: Press to increase temperature.
Main menu: Press to move the cursor right.
Menu screen: The button function varies with the screen.
Operation settings will appear.
When the backlight is off, pressing any button turns the
backlight on and it will stay lit for a certain period of time de-
pending on the screen.
Main display: Press to change the fan speed.
Menu screen: The button function varies with the screen.
5Backlit LCD
0Function button [F4]
83
83
Fri
Room
Set temp.
Mode Temp. Fan
Cool Auto
Main Main menu
Energy saving
Main display:
Cursor
Operation
Vane·Louver·Vent. (Lossnay)
High power
Comfort
Main menuMain display
Menu screen
7 8 9 0
7 8 9 0
7 8 9 0
Function guide
Controller interface

6
OCHT637
The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic”
mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.)
<Full mode> <Basic mode>
All icons are displayed for explanation.
Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Main menu.
1Operation mode
2Preset temperature
3Clock
4Fan speed
Functions of the corresponding buttons appear here.
5Button function guide
Appears when the ON/OFF operation is centrally controlled.
Appears when the operation mode is centrally controlled.
Appears when the preset temperature is centrally controlled.
Appears when the lter reset function is centrally controlled.
Indicates when lter needs maintenance.
1Room temperature
Appears when the buttons are locked.
Appears when the Weekly timer is enabled.
Appears while the units are operated in the energy saving
mode. (Will not appear on some models of indoor units)
Appears when the built-in thermistor on the remote control-
ler is activated to monitor the room temperature (1).
appears when the thermistor on the indoor unit is acti-
vated to monitor the room temperature.
Appears when an energy saving operation is performed us-
ing a “3D i-see Sensor” function.
Indicates the louver setting.
Indicates the ventilation setting.
Appears when the preset temperature range is restricted.
Indicates the vane setting.
6
7
8
9
0
2
4
5
7
8
9
)
!
Fri
Mode Temp. Fan
Room
Cool Set temp. Auto
83
83
1
2
3
4
5
6
78
90
1
2 34 5 6 7 8
9
)
@
!
#
$
Display
Appears when the On/O󰀨 timer or Auto-o󰀨 timer function is enabled.
3
appears when the timer is disabled by the centralized control system.
appears when the HOLD function is enable.
6
Appears while the outdoor units are operated in the silent mode.
@
Appears for a certain period of time when a centrally-con-
trolled item is operated.
#Centrally controlled
An check code appears during the preliminary error.
$Preliminary error display
Fri
Cool
Mode Temp. Fan
Set temp. Auto
$
83
5
4
3
2
1
#

7
OCHT637
Not all functions are available on all models of indoor units.
Energy saving
Main menu Press the MENU button.
Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button.
Operation
Initial setting menu
Manual vane angle
ON/OFF timer
Auto return
Clock
Main/Sub
Temp. range
Auto-OFF timer
Schedule
Daylight saving time
Clock
Administrator password
Operation locked
3D i-see Sensor
High power
Vane · Louver · Vent. (Lossnay)
Comfort
Timer
Energy saving
Basic setting
Display setting
Operation setting
Restriction
Weekly timer
OU silent mode
Timer menu
Main display
Display details
Contrast • Brightness
Language selection
Auto mode
Setback mode
Continue to the next page.

8
OCHT637
Maintenance menu
Service menu
Drain pump test run
Serial No. input
Diagnosis
Initialize remote controller
Remote controller information
Initialize maintenance info.
Test run
Model name input
Function setting
Error history
Maintenance password
Dealer information input
Error information
Test run menu
Maintenance information
Filter information
Cleaning
Settings menu
Check menu
Other menu
Auto descending panel
Descending operation
Self check
Descending adjustment
Remote controller check
Continue from the previous page.
Not all functions are available on all models of indoor units.

9
OCHT637
*1Clock setting is required.
*233.8°F (1°C) increments.
*3This function can only be set when certain outdoor units are connected.
Main menu list
Main
menu Setting and display items Setting details
Operation Vane · Louver · Vent.
(Lossnay)
Use to set the vane angle.
• Select a desired vane setting from 5 di󰀨erent settings.
Use to turn ON/OFF the louver.
• Select a desired setting from "ON" and "OFF."
Use to set the amount of ventilation.
• Select a desired setting from "O󰀨," "Low," and "High."
High power *3Use to reach the comfortable room temperature quickly.
• Units can be operated in the High-power mode for up to 30 minutes.
Comfort Manual
vane angle
Use to x each vane angle.
3D i-see Sensor Use to set the following functions for 3D i-see Sensor.
• Air distribution • Energy saving option • Seasonal airow
Timer Timer ON/OFF timer *1Use to set the operation ON/OFF times.
• Time can be set in 5-minute increments.
Auto-O󰀨
timer
Use to set the Auto-O󰀨 time.
• Time can be set to a value from 30 to 240 in 10-minute increments.
Weekly timer *1, *2Use to set the weekly operation ON/OFF times.
• Up to 8 operation patterns can be set for each day.
(Not valid when the ON/OFF timer is enabled.)
OU silent mode *1, *3Use to set the time periods in which priority is given to quiet operation of
outdoor units over temperature control. Set the Start/Stop times for each day
of the week.
•Select the desired silent level from "Normal," "Middle," and "Quiet."
Energy
saving
Restriction Temp. range *2Use to restrict the preset temperature range.
• Di󰀨erent temperature ranges can be set for di󰀨erent operation modes.
Operation lock Use to lock selected functions.
• The locked functions cannot be operated.
Energy
saving
Auto return *2Use to get the units to operate at the preset temperature after performing
energy saving operation for a specied time period.
• Time can be set to a value from 30 and 120 in 10-minute increments.
(This function will not be valid when the preset temperature ranges are restricted.)
Schedule *1Set the start/stop times to operate the units in the energy saving mode for
each day of the week, and set the energy saving rate.
• Up to 4 energy saving operation patterns can be set for each day.
• Time can be set in 5-minute increments.
• Energy saving rate can be set to a value from 0% or 50 to 90% in 10% increments.

10
OCHT637
Main
menu Setting and display items Setting details
Initial
setting
Basic
setting
Main/Sub When connecting 2 remote controllers, one of them needs to be designated as
a sub controller.
Clock Use to set the current time.
Daylight
saving time
Set the daylight saving time.
Administrator
password
The administrator password is required to make the settings for the following
items.
• Timer setting • Energy saving setting • Weekly timer setting
• Restriction setting • Outdoor unit silent mode setting
Display
setting
Main display Use to switch between "Full" and "Basic" modes for the Main display.
• The initial setting is "Full."
Display details Make the settings for the remote controller related items as necessary.
Clock: The initial settings are "Yes" and "24h" format.
Temperature: Set either Celsius (°C) or Fahrenheit (°F).
Room temp. : Set Show or Hide.
Auto mode: Set the Auto mode display or Only Auto display.
Contrast •
Brightness
Use to adjust screen contrast and brightness.
Language
selection
Use to select the desired language.
Operation
setting
Auto mode Whether or not to use the Auto mode can be selected by using the button.
This setting is valid only when indoor units with the Auto mode function are
connected.
Setback mode Whether or not to use the Setback mode can be selected by using the button.
This setting is valid only when indoor units with the Setback mode function
are connected.
Mainte-
nance
Error information Use to check error information when an error occurs.
• Check code, error source, refrigerant address, unit model, manufacturing number,
contact information (dealer's phone number) can be displayed.
(The unit model, manufacturing number, and contact information need to be
registered in advance to be displayed.)
Filter information Use to check the lter status.
• The lter sign can be reset.
Cleaning Auto
descending
panel
Use to lift and lower the auto descending panel (Optional parts).
Service Test run Select "Test run" from the Service menu to bring up the Test run menu.
• Test run • Drain pump test run
Input maintenance Select "Input maintenance Info." from the Service menu to bring up the
Maintenance information screen.
The following settings can be made from the Maintenance Information screen.
• Model name input • Serial No. input • Dealer information input • Initialize
maintenance info.
Settings Function setting Make the settings for the indoor unit functions via the remote controller as
necessary.
LOSSNAY setting This setting is required only when the operation of CITY MULTI units is
interlocked with LOSSNAY units.
Check
Error history
Display the error history and execute "delete error history".
Diagnosis Self check: Error history of each unit can be checked via the remote controller.
Remote controller check: When the remote controller does not work properly, use
the remote controller checking function to troubleshoot the problem.
Other Maintenance
password
Use to change the maintenance password.
Initialize remote
controller
Use to initialize the remote controller to the factory shipment status.
remote controller
information
Use to display the remote controller model name, software version, and serial
number.

OCHT637 11
3-3. IR wireless remote controller (Option)
ON/OFF TEMP
FAN
VANE
TEST RUN
AUTO STOP
AUTO START
h
min
LOUVER
MODE
CHECK
RESETSET CLOCK
MODEL SELECT
NOT AVAILABLE
CHECK TEST RUN
°C
AMPM
AMPM
VANE CONTROL button
Used to change the airflow direction.
CLOCK button
RESET button
SET button
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
MODE SELECT button
Used to switch the operation mode between
cooling, drying, heating, auto and fan mode.
CHECK-TEST RUN buttons
Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.
FAN SPEED SELECT button
Used to change the fan speed.
TIMER display
Displays when in timer operation or when
setting timer.
buttons
SET TEMPERATURE button sets any desired
room temperature.
CLOCK display
Displays the current time.
“ ” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
Buttons used to set the “hour and minute” of
the current time and timer settings.
“h” and “min” buttons
display
display
FAN SPEED display indicates which fan
speed has been selected.
display
The vertical direction of airflow is indicated.
display
Blinks when model is selected.
display
display
CHECK and TEST RUN display indicate that
the unit is being checked or test-run.
display
OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.
AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be
automatically stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.
MODEL SELECT
CHECK TEST RUN
LOUVER button
Changes left/right airflow direction.
(Not available for this model.)
SET TEMP. display indicates the set
temperature which is set.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.
TIMER CONTROL buttons

12 13
OCHT637
SPECIFICATIONS
4
A
A
kW
F.L.A
(m3/min)
Pa (mmAq)
dB
Model
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
TPKA0A0121HA70A
1 phase, 60 Hz, 208/230 V
15
1
White Munsell 1.0Y 9.2/0.2
Plate fin coil
Line flow fan (direct) o1
0.030
0.33
Dry: 320-370-425 (9-10.5-12)
Wet: 290-335-380 (8-9.5-11)
0 (direct blow)
Remote controller & built-in
36-40-43
5/8 (16)
35-3/8 (898)
9-13/16 (249)
11-5/8 (295)
29 (13)
1 phase, 60 Hz, 208/230 V
15
1
Plate fin coil
0(direct blow)
Remote controller & built-in
A
A
kW
F.L.A
Pa (mmAq)
dB
lb (kg)
Model
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
TPKA0A0181HA70A
White Munsell 1.0Y 9.2/0.2
0.030
0.33
36-40-43
Line flow fan (direct) o1
CFM
(m3/min)
CFM
inch (mm)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
lb (kg)
Dry: 320-370-425 (9-10.5-12)
Wet: 290-335-380 (8-9.5-11)
5/8 (16)
35-3/8 (898)
9-13/16 (249)
11-5/8 (295)
29 (13)

13
OCHT637
5NOISE CRITERION CURVES
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
TPKA0A0121HA70A
TPKA0A0181HA70A High
NOTCH
Low
43
SPL(dB)
36
LINE
MAIN UNIT
WALL
3.3 ft
3.3 ft
MICROPHONE

14 15
OCHT637
OUTLINES AND DIMENSIONS
6
TPKA0A0121HA70A TPKA0A0181HA70A Unit: inch (mm)
1/2F ( [ 12.7)
1/4F (
[ 6.35)
Refrigerant
Piping
Drain hose
Gas pipe
Liquid pipe
[2-1/2~[3-1/8
([65~[80)
[2-1/2~[3-1/8
([65~[80)
Through hole
Sleeve
(purchased locally)
Center measurement hole [3/32( [ 2.5)
5/32(3.8)
2-1/4(58) 0
Wall hole for
left rear piping
Knock out hole for
left rear piping
2-3/4×12-3/16(70×310)
Wall hole for
right rear piping
77-
[ 3/16( [ 5.1)
Tapping
screw hole
4- [ 5/16( [ 9)
Bolt hole Mount board
Indoor unit outline
0
5/8(16)
9-15/16(253.5)
9-1/8(232.5)
1-1/16(28.5)
1-9/16(41)
3-1/16(78.5)
4-1/16(103.5)
4-9/16(116)
6-1/2(166)
7(178.5)
8(203.5)
3-9/16(91)
13/16(21.8)
9-1/16(231.5)
10-3/4(273.2)
0
1-1/4(32.7)
2-9/16(66)
2-1/16(53.5)
5(128.5)
6(153.5)
3/4(20)
9/16(15)
14-5/8(372.3) 14(356.3) 12-7/8(237.5) 11-7/16(291.5) 10-3/8(265) 9-5/16(238) 8-13/16(225) 7-13/16(200)
4-7/8(125)
2-3/4(70)
9/16(15)
14-5/8(372.3) 14(356.3) 12-7/8(327.5) 10-3/8(265) 11-7/16(291.5) 7-13/16(200) 8-13/16(225) 4-7/8(125) 2-3/4(70) 0
17-5/8(449)
7-9/16(193.5)
7-1/16(180.3)
6-9/16(167)
5-1/2(140)
4-1/2(115)
6-13/16(174)
8-3/8(213)
9-5/16(238)
10-15/16(278.3)
15-1/2(394)
11-1/16(281)
17-5/8(449)
0
Emergency operation switch
(cooling/heating)
Terminal block for
MA-remote controller
Terminal block for power supply (option)
Front side(Grille open)
Terminal block for indoor/outdoor
connecting line
17-15/16(457)Gas pipe
21-3/16(539)Liquid pipe
6-5/8(169)
6-3/16(158)
Drain hose
7-3/16(184)
250mm,9-13/16inch or greater with optional drain pump installation.
Required space(Indoor unit)
(mm)
Air inlet
Air inlet
Air outlet
Min.1-31/32(50)
Min.9-13/16(250)
Min.5-7/8(150)
Min.8-5/8
(220)
Min.1-31/32(50)
Min.1/4(7)
Knock out hole for piping
D
2-3/16(56)
2-11/16(69)
3/16(6)
1-11/16(43)
C
2-3/16(56)7/16(12.5)
1-11/16(43)
B
1-3/4(46)
2-5/16(60)
2-5/16(59)
1-11/16(43)
A
1-11/16(43)
1-3/4(46)
2-3/16(56)
3/16(6)
A
Knock out hole
for right piping
Right side
Mount board
3/16(5)9-13/16(249)
Top side
15-3/16(387) 7-1/2(192)
7-3/4(197)
23-9/16(599)
CB
Operation lamp DEFROST/STAND BY lamp
Receiver
Louver(manual)
Vane(auto)
Knock out hole
for lower piping
Knock out hole
for lower piping
Under side
5/16(8)
24-1/16(612)
D
Knock out hole
for left piping
Left side
Front side
6-1/16(155)
2-1/8
(55)
27-1/16(688)
11-5/8(295)
35-3/8(898)
[ 5/8 ( [ 16) O.D
Effective length: 15-3/4 (400)

15
OCHT637
WIRING DIAGRAM
7
TPKA0A0121HA70A TPKA0A0181HA70A

16
OCHT637
REFRIGERANT SYSTEM DIAGRAM
8
Pipe temperature
thermistor/liquid (TH2)
Distributor
with strainer (#50/#50)
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)
TPKA0A0121HA70A TPKA0A0181HA70A

OCHT637 17
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
Not displayed
Judge what is wrong and take a corrective action
according to “9-3. SELF-DIAGNOSIS ACTION TABLE”.
Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA”.
The trouble is not reoccurring.
Logged
Not logged
1Consider 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
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
2
Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical component,
controller board, remote controller, etc.
1Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA”.
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.

18
OCHT637
[Procedure]
1. Press the CHECK button twice.
2. Press the TEMP buttons.
3. Point the remote controller at the
sensor on the indoor unit and
press the HOUR button.
4. Point the remote controller at the
sensor on the indoor unit and
press the ON/OFF button.
ON/OFF TEMP
FAN
VANE
MODE
CHECK
LOUVER
TEST RUN
AUTO STOP
AUTO START
h
min
RESET
SET CLOCK
CHECK
CHECK
display
Temperature
button
CHECK
button
Refrigerant
address
display
HOUR
button
ON/OFF
button
<Malfunction-diagnosis method at maintenance service>
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
<In the case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.
• "CHECK" lights, and refrigerant
address "00" blinks.
• Check that the remote controller's
display has stopped before continuing.
• Select the refrigerant address of the
indoor unit for the self-diagnosis.
Note: Set refrigerant address using the
outdoor unit’s DIP switch (SW1).
(For more information, see the
outdoor unit installation manual.)
• If an air conditioner error occurs, the
indoor unit's sensor emits an intermit-
tent buzzer sound, the operation lamp
blinks, and the check code is
output.
(It takes 3 seconds at most for check
code to appear.)
• The check mode is cancelled.
■IR wireless remote controller

19
OCHT637
[Output pattern A] Errors detected by indoor unit
[Output pattern B]
E9
1.If the beeper does not sound again after the initial
2 beeps to confirm 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 confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
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 the following tables for details on the check codes.
[Output pattern A]
Beeper sounds/OPERATION
INDICATOR lamp blinks Check code krameRmotpmyS
(Number of times)
IR wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks Check code
(Number of times)
IR wireless remote controller
Wired remote controller
1 P1 Intake sensor error
P9 Pipe (TH5) sensor error
2P2 Pipe (TH2) sensor error
3 E6,E7 Indoor/outdoor unit communication error
4 P4 Float switch connector (CN4F) open
5P5
PA
Drain pump error
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 (Pb)
–
Indoor fan motor error
Errors detected by unit other than indoor unit (outdoor unit, etc.)
krameRmotpmyS
1Indoor/outdoor unit communication error
2
(Transmitting error) (Outdoor unit)
3Open/short of outdoor unit thermistors
4Compressor overcurrent interruption (When compressor locked)
5Abnormal high discharging temperature/49C operated/
insufficient refrigerant
6Abnormal high pressure (63H operated)/Overheating
protection operation
7Abnormal temperature of heatsink
8Outdoor unit fan protection stop
9Compressor overcurrent interruption/Abnormal of power module
10 Abnormality of superheat due to low discharge temperature
11 Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
12
13
U2
U5
UP
U3,U4
UF
U1,Ud
U8
U6
U7
U9,UH
Others
–
–
–
–
14 Other errors (Refer to the technical manual for the outdoor unit.)
For details, check
theLED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.
12 FB (Fb)
–E0, E3
– E1, E2 Remote controller control board error
Remote controller transmission error
Compressor overcurrent interruption
14 PL Abnormality of refrigerant circuit
Notes:
Note: The supported check codes may vary depending on the connected outdoor unit.
Indoor unit control system error (memory error, etc.)

20
OCHT637
•If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.
Symptom Cause
Wired remote controller LED 1, 2 (PCB in outdoor unit)
On the IR wireless remote controller with condition above, following phenomena take place.
• No signals from the remote controller can be received.
• OPE lamp is blinking.
• The buzzer makes a short ping sound.
PLEASE WAIT
PLEASE WAIT Check code
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
For about 3
minutes after
power-on
Subsequent to
about 3 minutes
after power-on
After LED 1, 2 are lit, LED 2 is
turned off, then only LED 1 is
Only LED 1 is lit.
LED 1, 2 blink.
Only LED 1 is lit.
LED 1 blinks twice,
LED 2 blinks once.
•For about 3 minutes following power-on, op-
eration of the remote controller is notpossible
due tosystemstartup. (Cor rect operation)
•Connector for the outdoor unit’s protection
deviceis not connected.
•Reverse oropen phase wiring for theoutdoor
unit’s power terminal block (L1, L2, GR)
•Incorrect wiring between indoor and outdoor
units(incorrect polarity of S1, S2, S3)
•Remote controller wire short
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 wired remote controller) Indicates whether power is supplied to the wired 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.
lit. (Correct operation)
• On IR 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, check code.)