Mitsubishi Electric Mr. Slim PKA Series User manual

SERVICE MANUAL
Notes:
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CONTENTS
1. REFERENCE MANUAL...................................2
2. SAFETY PRECAUTION................................... 3
3. PARTS NAMES AND FUNCTIONS.................5
4. SPECIFICATIONS...........................................10
5. NOISE CRITERION CURVES.........................11
6. OUTLINES AND DIMENSIONS......................12
7. WIRING DIAGRAM.........................................13
8. REFRIGERANT SYSTEM DIAGRAM............14
9. TROUBLESHOOTING....................................15
10. FUNCTION SETTING.....................................29
11. SPECIAL FUNCTION.....................................30
12. DISASSEMBLY PROCEDURE.......................34
Indoor unit
[Model Name] [Service Ref.]
PARTS CATALOG (OCB637)
INDOOR UNIT
PKA-A12HA7
PKA-A12HA7
PKA-A18HA7
PKA-A18HA7
WIRED REMOTE
CONTROLLER
(Option) IR WIRELESS REMOTE
CONTROLLER (Option)
October 2016
No. OCH637
COOL
DRY
AUTO
FAN
HEAT
63/,76<67(0+($73803

2
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
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COOL
DRY
AUTO
FAN
HEAT
Remote controller (Optional parts)
OCH637

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.
OCH637

4
Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
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When charging directly from cylinder
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[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.
OCH637


3-2. Wiredremote controller (Option)
Function buttons
432 1
5
6
789 0
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.
Fri
Room
Set temp.
Mode Temp. Fan
Cool
Main
Main display:
Cursor Page
Main menu
Vane·Louver·Vent. (Lossnay)
High power
Timer
Weekly timer
OU silent mode
Main display Main menu
Function guide
ű1[ON/OFF] button
Press to turn ON/OFF the indoor unit.
ű2[SELECT] button
Press to save the setting.
ű3[RETURN] button
Press to return to the previous screen.
ű4[MENU] button
Press to bring up the Main menu.
ű5Backlit LCD
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 depending on the screen.
When the backlight is off, pressing any button turns the backlight on
and does not perform its function. (except for the [ON/OFF] button)
ű6ON/OFF lamp
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.
ű7Function button [F1]
Main display: Press to change the operation mode.
Main menu: Press to move the cursor down.
ű8Function button [F2]
Main display: Press to decrease temperature.
Main menu: Press to move the cursor up.
ű9Function button [F3]
Main display: Press to increase temperature.
Main menu: Press to go to the previous page.
ű0Function button [F4]
Main display: Press to change the fan speed.
Main menu: Press to go to the next page.
Controller interface
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83
83
3PARTS NAMES AND FUNCTIONS
3-1. Indoor unit
Filter Air intake
Louver Air outlet Vane
OCH637


The main display can be displayed in 2 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.)
<Basic mode>
ű3
Appears when the ON/OFF timer, Night setback, or Auto-OFF timer
function is enabled.
appears when the timer is disabled by the centralized control
system.
ű4
Appears when the Weekly timer is enabled.
ű5
Appears while the units are operated in the energy-save mode. (Will
not appear on some models of indoor units)
ű6
Appears while the outdoor units are operated in the silent mode.
ű7
Appears when the built-in thermistor on the remote controller is acti -
vated to monitor the room temperature (1).
appears when the thermistor on the indoor unit is activated to
monitor the room temperature.
ű9
Indicates the vane setting.
ű)
Indicates the louver setting.
ű!
Indicates the ventilation setting.
ű@
Appears when the preset temperature range is restricted.
ű1Operation mode
Indoor unit operation mode appears here.
ű2Preset temperature
Preset temperature appears here.
ű3Clock (See the Installation Manual.)
Current time appears here.
ű4Fan speed
Fan speed setting appears here.
ű5Button function guide
Functions of the corresponding buttons appear here.
ű6
Appears when the ON/OFF operation is centrally controlled.
ű7
Appears when the operation mode is centrally controlled.
ű8
Appears when the preset temperature is centrally controlled.
ű9
ű0
ű1Room temperature (See the Installation Manual.)
Current room temperature appears here.
ű2
Appears when the buttons are locked.
<Full mode>
* All icons are displayed for explanation.
83
83
Fri
Mode Temp. Fan
Room
Cool Set temp.
Fri
Cool
Mode Temp. Fan
Set temp.
4
3
2
1
5
6
7
8
90
1
3
9
4
)
@
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82
1
5
Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.
(Refer to operation manual included with remote controller.)
Display
Appears
83
!
ű8
Appears when the units are operated in the energy-save mode with 3D
i-see Sensor.
OCH637


Not all functions are available on all models of indoor units.
Energy saving
Auto return
Schedule
Night setback
Main menu Press the MENU button.
Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button.
Vane · Louver · Vent. (Lossnay)
High power
Weekly timer
Restriction
Maintenance
Initial setting
ON/OFF timer
Auto-Off timer
Temp. range
Operation lock
Manual vane angle
Main/Sub
Timer
Main display
Contrast
Display details
Auto mode
Administrator password
Language selection
Service
Input maintenance info.
Function setting
Check
Self check
Maintenance password
Remote controller check
Test run
Clock
Menu structure
Filter Information
Error Information
OU silent mode
3D i-see Sensor
OCH637


Setting and display items Setting details
Vane · Louver · Vent. (Lossnay) Use to set the vane angle.
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Use to turn ON/OFF the louver.
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Use to set the amount of ventilation.
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High power Use to reach the comfortable room temperature quickly.
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Timer On/Off timer* Use to set the operation ON/OFF times.
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Auto-Off timer Use to set the Auto-Off time.
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Weekly timer* Use to set the weekly operation ON/OFF times.
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Restriction Temp. range Use to restrict the preset temperature range.
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Operation lock Use to lock selected functions.
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Energy saving Auto return Use to get the units to operate at the preset temperature after performing energy-save operation for a
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Schedule* Set the start/stop times to operate the units in the energy-save mode for each day of the week, and set the
energy-saving rate.
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Night setback* Use to make Night setback settings.
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Filter information 8VHWRFKHFNWKH¿OWHUVWDWXV
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Error information Use to check error information when an error occurs.
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Maintenance Manual vane angle 8VHWRVHWWKHYDQHDQJOHIRUHDFKYDQHWRD¿[HGSRVLWLRQ
3D i-see Sensor Use to set the following functions for 3D i-see Sensor.
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Initial 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.
Main display Use to switch between "Full" and "Basic" modes for the Main display.
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Contrast Use to adjust screen contrast.
Display details Make the settings for the remote controller related items as necessary.
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Temperature: 6HWHLWKHU&HOVLXV&RU)DKUHQKHLW)
Room temp. : 6HW6KRZRU+LGH
Auto mode: 6HWWKH$XWRPRGHGLVSOD\RU2QO\$XWRGLVSOD\
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.
Administrator password The administrator password is required to make the settings for the following items.
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Language selection Use to select the desired language.
Service Test run Select "Test run" from the Service menu to bring up the Test run menu.
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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.
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Function setting Make the settings for the indoor unit functions via the remote controller as necessary.
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Refrigerant leak check: 5HIULJHUDQWOHDNVFDQEHMXGJHG
Smooth maintenance: 7KHLQGRRUDQGRXWGRRUPDLQWHQDQFHGDWDFDQEHGLVSOD\HG
Request code: 'HWDLOVRIWKHRSHUDWLRQGDWDLQFOXGLQJHDFKWKHUPLVWRUWHPSHUDWXUHDQGHUURUKLVWRU\FDQEHFKHFNHG
Self check Error history of each unit can be checked via the remote controller.
Maintenance password Use to change the maintenance password.
Remote controller check When the remote controller does not work properly, use the remote controller checking function to trouble-
shoot the problem.
Main menu list
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OCH637


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
NOTAVAILABLE
CHECK TEST RUN
°C
AMPM
AMPM
VANE CONTROL button
Used to change the air flow 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 air flow 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 desired
temperature which is set.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.
TIMER CONTROL buttons
OCH637


SPECIFICATIONS
4
A
A
kW
F.L.A
(m3/min)
Pa (mmAq)
dB
Service Ref.
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
PKA-A12HA7
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)
Service Ref.
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
PKA-A18HA7
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)
OCH637


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
PKA-A12HA7
PKA-A18HA7 High
NOTCH
Low 43
SPL(dB)
36
LINE
MAIN UNIT WALL
3.3 ft
3.3 ft
MICROPHONE
OCH637


OUTLINES AND DIMENSIONS
6
PKA-A12HA7 PKA-A18HA7 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)
OCH637


WIRING DIAGRAM
7
PKA-A12HA7 PKA-A18HA7
OCH637


REFRIGERANT SYSTEM DIAGRAM
8
Pipe temperature
termistor/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)
PKA-A12HA7 PKA-A18HA7
OCH637


TROUBLESHOOTING
9
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
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UL]HGLQWKHWDEOHEHORZ&KHFNWKHFRQWHQWVEHORZEHIRUHLQYHVWLJDWLQJGHWDLOV
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.
OCH637


[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 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.
Ŷ,5ZLUHOHVVUHPRWHFRQWUROOHU
OCH637


[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
1P1
Intake sensor error
P9 Pipe (TH5) sensor error
2P2 Pipe (TH2) sensor error
3E6,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 Communication 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
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.
12 FB (Fb) Indoor unit control system error (memory error, etc.)
–E0, E3
– E1, E2 Remote controller control board error
Remote controller transmission error
Compressor overcurrent interruption
14 PL Abnormality of refrigerant circuit
Notes:
OCH637


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 2
minutes after
power-on
Subsequent to
about 2 minutes
after power-on
After LED 1, 2 are lighted, LED 2 is
turned off, then only LED 1 is
Only LED 1 is lighted.
LED 1, 2 blink.
Only LED 1 is lighted.
LED 1 blinks twice,
LED 2 blinks once.
For about 2 minutes following power-on, op-
eration of the remote controller is not possible
due to system start-up.(Correct operation)
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)
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.
lighted. (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.)
OCH637


9-3. SELF-DIAGNOSIS ACTION TABLE
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Check code Abnormal point and detection method Cause Countermeasure
3
Room temperature thermistor (TH1)
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Pipe temperature thermistor/liquid (TH2)
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