Mitsubishi Electric PKA-A18HA6, PKA-A12HA6, PCA, PCA-A24KA6, PCA-A36KA6 Service Manual

SERVICE MANUAL

Notes:

• This manual describes
service data of the indoor
units only.

• RoHS compliant products
have <G> mark on the
spec name plate.

CONTENTS

1. REFERENCE MANUAL

...................................

2

2. SAFETY PRECAUTION

...................................

3

3. PARTS NAMES AND FUNCTIONS

.................

4

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. SPECIAL FUNCTION

.....................................

29

11. DISASSEMBLY PROCEDURE

.......................

32

Indoor unit
[Model Name] [Service Ref.]

PARTS CATALOG (OCB580)

INDOOR UNIT

PKA-A12HA6

PKA-A12HA6

PKA-A18HA6

PKA-A18HA6

WIRED REMOTE

CONTROLLER

(Option)

IR WIRELESS REMOTE
CONTROLLER (Option)

December 2014

No. OCH580

COOL

DRY

AUTO

FAN

HEAT

SPLIT-SYSTEM HEAT PUMP

2

1

REFERENCE MANUAL

1-1. OUTDOOR UNIT SERVICE MANUAL

Model Name Service Ref. Service Manual No.

PUZ-A18/24/30/36NHA6
PUZ-A18/24/30/36NHA6-BS

PUZ-A18/24/30/36NHA6
PUZ-A18/24/30/36NHA6-BS

OCH577

OCB577

PUY-A12/18/24/30/36NHA6
PUY-A12/18/24/30/36NHA6-BS

PUY-A12/18/24/30/36NHA6
PUY-A12/18/24/30/36NHA6-BS

Radio frequency interface Wired remote controller IR wireless remote controller

COOL

DRY

AUTO

FAN

HEAT

RF thermostat

Remote controller (Optional parts)

OCH580

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 com­pressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera­nt 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 deterio­ration of refrigerant oil, etc.

If large amount of mineral oil enters, that can cause deterio­ration 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 refrige­rant 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 refrige­rant 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.

[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) When performing service, install a filter drier simultaneously.

Be sure to use a filter drier for new refrigerant.

OCH580

4

Gravimeter

Unit

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

3

PARTS NAMES AND FUNCTIONS

Indoor unit

Filter

Air intake

Louver

Air outlet

Vane

No. Tool name Specifications

1

Gauge manifold · Only for R410A

· Use the existing fitting

specifications

. (UNF1/2)

· Use high-tension side pressure of 5.3MPa·G or over.

2

Charge hose · Only for R410A

· Use pressure performance of 5.09MPa·G or over.

3

Electronic scale

—

4

Gas leak detector

· Use the detector for R134a, R407C or R410A.

5

Adaptor for reverse flow check

· Attach on vacuum pump.

6

Refrigerant charge base

—

7

Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

8

Refrigerant recovery equipment

—

[2] Additional refrigerant charge

When charging directly from cylinder

· Check that cylinder for R410A on the market is syphon type.

· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

OCH580

5

Wired remote controller (Option)

Function buttons

4 3 2 1

5

6

7 8 9

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

▌1 [ON/OFF] button

Press to turn ON/OFF the indoor unit.

▌2 [SELECT] button

Press to save the setting.

▌3 [RETURN] button

Press to return to the previous screen.

▌4 [MENU] button

Press to bring up the Main menu.

▌5 Backlit 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)

▌6 ON/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.

▌7 Function button [F1]

Main display: Press to change the operation mode.

Main menu: Press to move the cursor down.

▌8 Function button [F2]

Main display: Press to decrease temperature.

Main menu: Press to move the cursor up.

▌9 Function button [F3]

Main display: Press to increase temperature.

Main menu: Press to go to the previous page.

▌0 Function button [F4]

Main display: Press to change the fan speed.

Main menu: Press to go to the next page.

Controller interface

7 8 9

0

7 8 9

0

OCH580

6

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.)

<Basic mode>

▌3

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.

▌4

Appears when the Weekly timer is enabled.

▌5

Appears while the units are operated in the energy-save mode. (Will
not appear on some models of indoor units)

▌6

Appears while the outdoor units are operated in the silent mode.

▌7

Appears when the built-in thermistor on the remote controller is acti­vated to monitor the room temperature (1).

appears when the thermistor on the indoor unit is activated to

monitor the room temperature.

▌8

Indicates the vane setting.

▌9

Indicates the louver setting.

▌)

Indicates the ventilation setting.

▌!

Appears when the preset temperature range is restricted.

▌1 Operation mode

Indoor unit operation mode appears here.

▌2 Preset temperature

Preset temperature appears here.

▌3 Clock (See the Installation Manual.)

Current time appears here.

▌4 Fan speed

Fan speed setting appears here.

▌5 Button function guide

Functions of the corresponding buttons appear here.

▌6

Appears when the ON/OFF operation is centrally controlled.

▌7

Appears when the operation mode is centrally controlled.

▌8

Appears when the preset temperature is centrally controlled.

▌9

▌0

▌1 Room temperature (See the Installation Manual.)

Current room temperature appears here.

▌2

Appears when the buttons are locked.

<Full mode>

* All icons are displayed for explanation.

Fri

Mode Temp. Fan

Room

Cool

Set temp.

Fri

Cool

Mode Temp. Fan

Set temp.

4

3

2

1

5

6

7

8

9

0

1

3

9

4

)

!

2 3 4 5 6 7 8

2

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

OCH580

7

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

Lossnay (City Multi only)

Check

Self check

Maintenance password

Remote controller check

Test run

Clock

Auto descending panel

Menu structure

Filter Information

Error Information

OCH580

8

Setting and display items Setting details

Vane · Louver · Vent. (Lossnay) Use to set the vane angle.

• Select a desired vane setting from ve different 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 "Off," "Low," and "High."

High power Use to reach the comfortable room temperature quickly.

• Units can be operated in the High-power mode for up to 30 minutes.

Timer On/Off timer* Use to set the operation On/Off times.

• Time can be set in 5-minute increments.

Auto-Off timer Use to set the Auto-Off time.

• Time can be set to a value from 30 to 240 in 10-minute increments.

Weekly timer* Use 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.)

Restriction Temp. range Use to restrict the preset temperature range.

• Different temperature ranges can be set for different operation modes.

Operation lock Use to lock selected functions.

• The locked functions cannot be operated.

Energy saving Auto return Use to get the units to operate at the preset temperature after performing energy-save 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* 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.

• Up to 4 energy-save 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.

Night setback* Use to make Night setback settings.

• Select "Yes" to enable the setting, and "No" to disable the setting. The temperature range and the start/stop times can be set.

Filter information Use to check the lter status.

• The lter sign can be reset.

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.)

Maintenance Auto descending panel Auto descending panel (Optional parts) Up / Down you can do.

Manual vane angle Use to set the vane angle for each vane to a xed position.

Initial setting Main/Sub When connecting two 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.

• The initial setting is "Full."

Contrast Use to adjust screen contrast.

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.

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.

• Timer setting • Energy-save setting • Weekly timer setting

• Restriction setting • Outdoor unit silent mode setting • Night set back

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.

• 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

Function setting Make the settings for the indoor unit functions via the remote controller as necessary.
Check Error history: Display the error history and execute “delete error history”.

Refrigerant leak check: Refrigerant leaks can be judged.
Smooth maintenance: The indoor and outdoor maintenance data can be displayed.
Request code: Details of the operation data including each thermistor temperature and error history can be checked.

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 trou­blushoot the problem.

Main menu list

* Clock setting is required.

OCH580

9

● 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 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

OCH580

10

SPECIFICATIONS

4

A
A

kW

F.L.A

m

3

/min(CFM)

Pa(mmAq)

dB
mm (in)
mm (in)
mm (in)
mm (in)

kg (lb)

Service Ref.

Power supply(phase, cycle, voltage)

Max. Fuse Size

Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) o No.

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-A12HA6

1 phase, 60 Hz, 208/230 V

15

1

White Munsell 1.0Y 9.2/0.2

Plate fin coil

Line flow fan (direct) o 1

0.030

0.33

Dry: 9-10.5-12 (320-370-425)

Wet: 8-9.5-11 (290-335-380)

0(direct blow)

Remote controller & built-in

36-40-43

16(5/8)

898 (35-3/8)

249 (9-13/16)

295 (11-5/8)

13 (29)

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

K/min(CFM)

Pa(mmAq)

dB

mm (in)
mm (in)
mm (in)

kg (lb)

Service Ref.

Power supply(phase, cycle, voltage)

Max. Fuse Size

Min.Circuit Ampacity

External finish
Heat exchanger
Fan Fan(drive) o No.

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-A18HA6

White Munsell 1.0Y 9.2/0.2

0.030

0.33

Dry: 9-10.5-12 (320-370-425)

Wet: 8-9.5-11 (290-335-380)

36-40-43

16(5/8)

898 (35-3/8)

249 (9-13/16)

295 (11-5/8)

13 (29)

Line flow fan (direct) o 1

mm (in)

OCH580

11

5

NOISE 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-A12HA6
PKA-A18HA6

High

NOTCH

Low

43

SPL(dB)

36

LINE

UNIT

WALL

3.3ft

3.3ft

MICROPHONE

OCH580

12

OUTLINES AND DIMENSIONS

6

PKA-A12HA6 PKA-A18HA6 Unit: in (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)

C

B

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)

OCH580

13

WIRING DIAGRAM

7

PKA-A12HA6 PKA-A18HA6

The black square(■)indicates
a switch position.

Notes:

1. SymboIs used in wiring diagram above are, : Connector, :: Terminal (block).

2. Indoor and outdoor connecting wires have poIarities, make sure to match terminal numbers (S1, S2, S3)for correct wirings.

3. Since the outdoor side electric wiring may change, be sure to check the outdoor unit electric wiring diagram for servicing.

4. This diagram shows the wiring of indoor and outdoor connecting wires. (specification of 230V), adopting superimposed
system of power and signal.
1 : Use copper supply wires.

Utilisez des fils d,alimentation en cuivre.

Refer to
tables
1and 2

CN90

(WHT)

CN2L
(RED)

CN151
(WHT)

CN20
(RED)

CN105

(RED)

CN44

(WHT)

CN4F

(WHT)

CN22
(BLU)

CN41

(WHT)

CN51

(WHT)

CN32

(WHT)

CNMF
(WHT)

S.W

SWE

R.B

CNP(BLU)

CN3C
(BLU)

LDSWE(A)

(BLU)

LDSWE(B) SWE2

CN01
(BLK)

DB1

X1

FUSE

I.B

1

1

1 1 1 54

1 1

1
2

1 4 1 4

1 525

TH1 TH2 TH5

2

11 39

CN152
(WHT)

CN30
(BLK)

11 310

3

3

3

2

2

1

2

1

1

1

5

6

3

M

t

○

t○t

○

MS

3~

TB4

TB5

S1
S2
S3

ORN

ORN

ORN

BRN

LED1

LED3

LED2

TB6

ON
OFF

TO
OUTDOOR
UNIT

YLWYLW

BLK

<Table 1>
SW1
(MODEL SELECTION)

SETTING

SETTING

ON
OFF

1 2 3 4 5

<Table 2>
SW2(CAPACITY CODE)

MODELS

PKA­A12HA6

PKA­A18HA6

ON
OFF

1 2 3 4 5

ON
OFF

1 2 3 4 5

W.B

RFI

CNRU

(WHT)

LD101(B)

REC1

LED1

LED2

6

2

5

RU

Symbol

Name

Symbol

Name

I.B Indoor controller board

FUSE FUSE(T3.15AL250V)

RFI

Radio frequency interface for RF thermostat

CN2L Connector (LOSSNAY)
CN30 Connector (LLC)

CN105 Connector (Radio frequency interface)
CN152 Connector (Back-up heating)

CN90 Connector (Remote operation adapter)

Connector (Emergency operation)

CN32 Connector ( Remote switch)
CN41 Connector (HA terminal-A)
CN51 Connector (Centrally control)

LED1 Power supply (I.B)
LED2 Power supply (R.B)
LED3 Transmission (Indoor-outdoor)
SW1 Switch (Model selection) See table 1
SW2
SWE

Switch (Capacity code) See table 2

[Explanation of symbols]

MS Fan motor

W.B Pcb for IR wireless remote controller

Switch board

SWE2 Emergency operation

M Vane motor

LED1 LED (Operation indication : Green)

REC1 Receiving unit

LED2 LED (Preparation for heating: Orange)

TB2 Terminal block(Indoor unit Power (option))
TB4 Terminal block (Indoor/outdoor connecting line)
TB5 Terminal block (Remote controller transmission line)
TH1 Room temp. Thermistor

Pipe temp. Thermistor/liquid

Cond./eva. temp. Thermistor

(32˚F/15ΚΩ, 77˚F/5.4ΚΩ Detect)

(32˚F/15ΚΩ, 77˚F/5.4ΚΩ Detect)

(32˚F/15ΚΩ, 77˚F/5.4ΚΩ Detect)

TH2

TH5

S.W

R.B

OPTION PART

Wired remote controller board

TB6

Terminal block (Remote controller transmission line)

OCH580

14

REFRIGERANT SYSTEM DIAGRAM

8

Thermistor TH2
Pipe temperature(Liquid)

Distributor
with strainer (#50/#50)

Thermistor TH5
(Cond./ Eva.temperature)

Thermistor TH1
(Room temperature)

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-A12HA6 PKA-A18HA6

OCH580

15

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 out­doorunit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa­rized 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.

OCH580

16

[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.

■IR wireless remote controller

OCH580

17

[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 sOn0.5 sOn0.5 s

On

0.5 s

Off

Approx. 2.5 s

On

Approx. 3 s

On

0.5 sOn0.5 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

1st2nd3

rd

1st2

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 sOn0.5 sOn0.5 sOn0.5 s

On

0.5 s

Off

Approx. 2.5 sOn0.5 sOn0.5 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

1st2nd3

rd

1st2

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

2

P2 Pipe (TH2) sensor error

3 E6,E7

Indoor/outdoor unit communication error

4 P4 Float switch connector (CN4F) open

5

P5
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

–

–

–

Errors detected by unit other than indoor unit (outdoor unit, etc.)

krameRmotpmyS

1

Indoor/outdoor unit communication error

2

(Transmitting error) (Outdoor unit)

3

Open/short of outdoor unit thermistors

4

Compressor overcurrent interruption (When compressor locked)

5

Abnormal high discharging temperature/49C operated/
insufficient refrigerant

6

Abnormal high pressure (63H operated)/Overheating
protection operation

7

Abnormal temperature of heatsink

8

Outdoor unit fan protection stop

9

Compressor 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 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:

OCH580

18

•

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.)

OCH580

19

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

P2

Room temperature thermistor (TH1)

1 The 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 min­utes. (The unit returns to normal opera­tion, if it has been reset normally.)

2 Constantly detected during cooling,
drying, and heating operation.
Short: 194°F [90:] or more
Open: −40°F [−40:] or less

1 Defective thermistor
characteristics
2 Contact failure of connector

(CN20) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact
failure of thermistor wiring
4 Defective indoor controller

board

1–3 Check 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 failure can be
detected.
2 Check 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.

4 Check 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.

Pipe temperature thermistor/Liquid (TH2)

1 The 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 min­utes. (The unit returns to normal opera­tion, if it has been reset normally.)

2 Constantly detected during cooling,
drying, and heating (except defrosting)

operation

Short: 194°F [90:] or more
Open: −40°F [−40:] or less

Note:

When all of the following conditions are sat­isfied, the error is not detected:

1) During cooling operation, or for 3 min­utes after cooling operation is stopped.

2) Up to 16 minutes from 10 seconds after
cooling operation is started.

3) Outside temperature < −22°F [−30:]

1 Defective thermistor
characteristics
2 Contact failure of connector

(CN44) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact
failure of thermistor wiring
4 Defective refrigerant circuit is

causing thermistor temperature
of 194°F [90:] or more, or

−40°F [−40:] or less.

5 Defective indoor controller

board

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check 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 Check 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.

5 Check 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.

(3 and 4 of connector CN4F is not

short-circuited.)

• Constantly detected during operation

1 Contact failure of connector
(Insert failure)

2 Defective indoor controller

board

1 Check contact failure of float switch connector.
Turn the power on again and check after insert-

ing connector again.

2 Operate with connector (CN4F) short-circuited.
Replace indoor controller board if abnormality

reappears.

P5

Drain over flow protection operation

1 Suspensive 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.

2 Drain pump is abnormal if the condition

above is detected during suspensive
abnormality.

3 Constantly detected during drain pump

operation

1 Malfunction of drain pump
2 Defective drain

Clogged drain pump
Clogged drain pipe
3 Defective drain float switch

Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)

4 Defective indoor-controller

board

1 Check if drain-up machine works.
2 Check drain function.
3 Remove 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.

4 Replace indoor controller board if it is short-

circuited between 3–4 of the drain float
switch connector CN4F and abnormality
reappears.

It 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.

OCH580

20

Check code

Abnormal point and detection method

Cause

Countermeasure

P6

Freezing/overheating protection is work­ing

1 Freezing protection (Cooling mode)

• In case when
outside temperature > −4°F [−20:]

The unit is in 6-minute resume preven­tion 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.

• In case when
outside temperature [ −4°F [−20:]

The unit is in 6-minute resume preven­tion mode if pipe <liquid or condenser/
evaporator> temperature stays under

−31°F [−35:] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −31°F [−35:]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.

2 Overheating protection (Heating mode)

The unit is in 6-minute resume
prevention mode if pipe <liquid or con­denser/evaporator> temperature is
detected as over 158°F [70:] after the
compressor started. Abnormal if the tem­perature of over 158°F [70:] is detected
again within 30 minutes after 6-minute
resume prevention mode.

P8

1 Slight 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

2 Converse connection of
extension pipe (on plural units

connection)

3 Converse wiring of indoor/
outdoor unit connecting wire

(on plural units connection)

4 Defective detection of indoor

room temperature and pipe
<condenser/evaporator>

temperature thermistor
5 Stop valve is not opened
completely.

(Cooling or drying mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Low-load (low temperature)

operation out of the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is defec­tive.

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

(Heating mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Over-load (high temperature)

operation out of the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is defec­tive.

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

8 Bypass circuit of outdoor unit is

defective.

(Cooling or drying mode)

1 Check clogs of the filter.
2 Remove shields.

4 Refer to "9-6. HOW TO CHECK THE

PARTS".

5 Check outdoor fan motor.
67 Check operating condition of refrigerant

circuit.

(Heating mode)

1 Check clogs of the filter.
2 Remove shields.

4 Refer to "9-6. HOW TO CHECK THE

PARTS".

5 Check outdoor fan motor.
6–8Check operating condition of refrigerant

circuit.

Pipe temperature

<Cooling mode>
Detected as abnormal when the pipe tem­perature is not in the cooling range 3 min­utes 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 heat­ing 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)

1–4 Check pipe <liquid or condenser/evapora-

tor> temperature with room temperature
display on remote controller and outdoor
controller circuit board.

Pipe <liquid or condenser/evaporator>

temperature display is indicated by set­ting SW2 of outdoor controller circuit
board as follows.

23Check converse connection of extension

pipe or converse wiring of indoor/outdoor
unit connecting wire.

Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool(PAC-SK52ST)’.

(

)

OCH580

21

Check code

Abnormal point and detection method

Cause

Countermeasure

P9

Pipe temperature thermistor/
Condenser-Evaporator (TH5)

1 The 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.)

2 Constantly detected during cooling,

drying, and heating operation (except
defrosting)

Short: 194°F [90:] or more
Open: −40°F [−40:] or less

Note:

When all of the following conditions are
satisfied, the error is not detected:

1) During cooling operation, or for 3 min­utes after cooling operation is stopped.

2) Up to 16 minutes from 10 seconds after
cooling operation is started.

3) Outside temperature < −22°F [−30:]

1 Defective thermistor
characteristics
2 Contact failure of connector

(CN44) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact
failure of thermistor wiring
4 Temperature of thermistor is

194°F [90:] or more or −40°F
[−40:] or less caused by
defective refrigerant circuit.

5 Defective indoor controller

board

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check 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)

1 The unit has a water leakage abnor-

mality when the following conditions, a)
and b), are satisfied while the above­mentioned 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.

1 Drain pump trouble
2 Drain defective

· Drain pump clogging

· Drain pipe clogging

3 Open circuit of float switch
4 Contact failure of float switch

connector

5 Dew condensation on float switch

· Drain water descends along
lead wire.

· Drain water is waving due to
filter clogging.
6 Extension piping connection dif-

ference at twin, triple or quadru­ple system

7 Miswiring of indoor/outdoor con-

necting at twin, triple or quadru­ple system

8 Room temperature thermistor/

liquid pipe temperature thermis­tor detection is defective.

1 Check the drain pump.
2 Check whether water can be drained.

3 Check the resistance of the float switch.
4 Check the connector contact failure.

5 Check the float switch leadwire mounted.

Check the filter clogging.

6 Check the piping connection.

7 Check the indoor/outdoor connecting wires.

8 Check the room temperature display of

remote controller.

Check the indoor liquid pipe temperature dis-

play of outdoor controller board.

E0

or

E4

Remote controller transmission
error(E0)/signal receiving error(E4)

1 Abnormal 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)
2 Abnormal if sub remote controller could

not receive any signal for 2 minutes.
(Check code: E0)

1 Abnormal 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)

2 Indoor controller board cannot receive

any signal from remote controller for 2
minutes. (Check code: E4)

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.
3 Check 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 controller:
max. 2 units

If the cause of trouble is not in above 1–3,
4 Diagnose remote controllers.

a) When “RC 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 “RC NG” is displayed,

Replace remote controller.

c)When “RC E3” or “ERC 00-66” is displayed,

noise may be causing abnormality.

Note: If the unit is not normal after replacing indoor

controller board in group control, indoor con­troller board of address “0” may be abnormal.

1 Contact failure at transmission

wire of remote controller

2 All 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.

3 Miswiring of remote controller
4 Defective transmitting receiving

circuit of remote controller

5 Defective transmitting receiving

circuit of indoor controller board
of refrigerant addresses “0”.

6 Noise has entered into the

transmission wire of remote
controller.

OCH580

22

E6

E7

Check code

Abnormal point and detection method

Cause

Countermeasure

Fb

E1

or

E2

1 Contact failure, short circuit or,

miswiring (converse wiring) of
indoor/outdoor unit connecting
wire

2 Defective transmitting receiving

circuit of indoor controller board

3 Defective transmitting receiving

circuit of indoor controller board

4 Noise 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.
2–4 Turn the power off, and on again to check.

If abnormality generates again, replace
indoor controller board or outdoor

controller circuit board.

Note: Other indoor controller board may have

defect in the case of twin triple indoor
unit system.

Indoor/outdoor unit communication
error (Transmitting error)

Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.

1 Defective transmitting receiving

circuit of indoor controller board

2 Noise has entered into power

supply.

3 Noise has entered into outdoor

control wire.

1–3 Turn the power off, and on again to check.

If abnormality generates again, replace
indoor controller board.

Indoor/outdoor unit communication error
(Signal receiving error)

1 Abnormal if indoor controller board
cannot receive any signal normally for 6

minutes after turning the power on.

2 Abnormal if indoor controller board
cannot receive any signal normally for 3

minutes.

3 Consider 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 cir-

cuit board to transmit signals.

Indoor controller board

Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.

1 Defective indoor controller

board

1 Replace indoor controller board.

Remote controller control board

1 Abnormal if data cannot be read nor-

mally from the nonvolatile memory of the
remote controller control board.

(Check code: E1)

2 Abnormal if the clock function of remote

controller cannot be operated normally.

(Check code: E2)

1 Defective remote controller 1 Replace remote controller.

E3

or

E5

Remote controller transmission
error(E3)/signal receiving error(E5)

1 Abnormal if remote controller could not

find blank of transmission path for 6 sec-

onds and could not transmit.
(Check code: E3)

2 Remote 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)
1 Abnormal 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)

1 Set a remote controller to main, and the

other to sub.

2 Remote controller is connected with only one

indoor unit.

3 The address changes to a separate setting.

4–6 Diagnose remote controller.

a) When “RC 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 “RC NG” is displayed, replace

remote controller.
c)

When “RC E3” or “ERC 00-66” is dis-

played, noise may be causing abnormality.

1 2 remote controllers are set as

“main.”
(In case of 2 remote con­ trollers)
2 Remote controller is connected

with 2 indoor units or more.
3 Repetition of refrigerant

address
4 Defective transmitting receiving

circuit of remote controller
5 Defective transmitting receiving

circuit of indoor controller board
6

Noise has entered into transmis-

sion wire of remote controller.

PL

Abnormal refrigerant circuit

During Cooling, Dry, 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

condense/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.

OCH580

23

Note: Refer to the manual of outdoor unit for the detail of remote
controller.

(1)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

horizontal regardless of remote control.)

Check (left).

• Check the vane motor. (Refer to “How

to check the parts”.)

• Check for breaking of wire or connec-

tion failure of connector.

Normal operation (Each connector on

vane motor side is disconnected or set­ting the fixed vanes by wired remote
controller.)

Phenomena

Cause

Countermeasure

(2)Receiver for IR wireless remote
controller

Weak batteries of IR wireless remote controller

Contact failure of connector (CNB) on IR wireless

remote controller board
(Insert failure)

Contact failure of connector (CN90) on indoor con-

troller board (Insert failure)

Contact failure of connector between IR wireless

remote controller board and indoor controller board

Replace batteries of IR wireless remote

controller.

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 IR wireless remote controller
board.

9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

–

OCH580

24

9-5. EMERGENCY OPERATION

9-5-1. When IR 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

A

DEFROST/STAND BY lamp (ORANGE)

B

Operation lamp (GREEN)

C

Emergency operation switch (cooling/heating)

D

Receiver

[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 Mod
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

E.O.
SW

1. When the wired remote control or the indoor unit microprocessor 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.
Note on the IR 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 nesessary 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, thereforeyou have to slowly set them manually to
the appropriate position.

OCH580

25

9-6. HOW TO CHECK THE PARTS

Parts name Check points

Vane motor (MV)

Measure the resistance between the terminals with a tester. (Coil temperature 77_F [25°C])

Normal

350 " ± 7%

Abnormal

1-2

Brown-Red

1-3

Brown-Orange

1-4

Brown-Yellow

1-5

Brown-Green

Open or short

Fan motor (MF)

2

Red

4

Yellow

1

Brown

Orange

3

Green

5

Connect pin No.

M

Refer to “9-6-2. DC Fan motor (fan motor/indoor controller circuit board)”.

Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 50 to 86_F [10 to 30°C])

(Refer to “9-6-1. Thermistor”.)

Room temperature
thermistor (TH1)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)

Normal

4.3 to 9.6 k"

Abnormal

Open or short

9-6-1. Thermistor

<Thermistor Characteristic graph>

Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature
thermistor (TH5)

Thermistor R

0=15 k ± 3%

Fixed number of B=3480 ± 2%

t(

)Rt=15exp { 3480( ) }

Thermistor for
lower temperature

1

273+t1273

0

10

20

30

40

50

-20 -10 0 10 20 30 40 50

-4 -14 32 50 68 86 104122 °F
Temperature

Resistance (k )

<Thermistor for lower temperature>

1

273+

1

273

T-32

1.8

°C

"

32°F [0°C]
50°F [10°C]
68°F [20°C]
77°F [25°C]
86°F [30°C]
104°F [40°C]

15 k"

9.6 k"

6.3 k"

5.4 k"

4.3 k"

3.0 k"

PKA-A12HA6 PKA-A18HA6

OCH580

26

9-6-2. DC Fan motor (fan motor/indoor controller circuit board)

Notes

· High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.

· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit

board and fan motor.)

Self check
Symptom : The indoor fan cannot rotate.

Yes

NG

NG

Wiring contact check

Contact of fan motor connector (CNMF)

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

board.

TEST POINT

1 : VDC (between 1 (+) and 3 (−) of the fan connector): VDC 294–325 V DC

TEST POINT 2 : VCC (between 4 (+) and 3 (−) of the fan connector): VCC 15 V DC

Wiring recovery

Replace the indoor controller board.

Replace the fan motor.

Replace the indoor

controller board.

Replace the fan motor.

Is the voltage normal?

Is there contact failure?

No

1

2

Yes

No

Check the operation of fan. END

Yes

OK

Check the operation END

OK

Check method of DC fan motor (fan motor/indoor controller circuit board)

Sensor signal check

Measure the voltage between CNMF

6 and 3 0 and

15 V DC in the indoor controller circuit board.

Does the voltage repeat
0 and 15 V DC?

No

Yes

Indoor controller board fuse check

Is the fuse normal?

Replace

the fuse.

Check the operation END

OK

Replace the indoor

controller board.

Check the operation

END

OK

NG

Replace the fan motor.

Yes

No

NG

OCH580

27

9-7. TEST POINT DIAGRAM

Indoor controller board

PKA-A12HA6 PKA-A18HA6

{

CN51

Centrally control

1–2: Control signal

13 V DC pulse input (1: +)

3–4: Operation indicator

13 V DC (3: +)

3–5: Malfunction indicator

13 V DC (3: +)

CN44

Pipe temperature thermistor

1–2: Liquid (TH2)
3–4:

Condenser/Evaporator

(TH5)

CN20

Room temp.
thermistor (TH1)

CN90

Connect to the remote
operation adapter

CNMF

Connect to the
fan motor (MF)

1–3: 294–325 V DC
4–3: 15 V DC
5–3: 0–6.5 V DC
6–3: 0

or 15 V DC

FUSE

(3.15 A, 250 V)

SWE

Emergency
operation connector

SW1

Model selection

SW2

Capacity setting

CN151

Connect to the
vane motor (MV)

Jumper wire J41,J42

Pair No. setting for
IR wireless remote
controller

CN01

Connect to the
Terminal block (TB4)
1–3: 208/230 V AC

LED1:Power supply (I.B)
LED2:Power supply (R.B)
LED3:Transmission

(Indoor/outdodr)

CN3C

Transmission
(Indoor/outdodr)
(DC 0~24V)

CN30

Connector (LLC)

CN22

Connect to the terminal
block (TB5) (Remote
controller connecting
wire)

CN2L

Connector
(LOSSNAY)

SWE2

Emergency
operation switch

CN41

Connector
(HA terminal-A)

IR wireless remote controller board

CN32

Remote switch

CN152
Connector
(Back-up heating)

CN105
RFI
(Radio frequency interface)

OCH580

28

9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE

Each function is controlled by the DIP switch and the jumper wire on indoor controller board.

PKA-A12HA6 PKA-A18HA6

SW1

Setting by the DIP switch and jumper wire

Functions

Jumper wire

Model
settings

Capacity
settings

Pair number
setting with
IR wireless
remote
controller

Remarks

SW2

J41
J42

Indoor
controller
board type
setting

JP3

0
1
2

3–9

Wireless remote
controller setting

Control PCB setting

J41 J42

<Initial setting>
IR wireless remote controller: 0
Control PCB: (for both J41 and J42)
4 pair number settings are supported.
The pair number settings of the wireless remote
controller and indoor control PCB (J41/J42) are
given in the table on the left.
(' ' in the table indicates the jumper wire is dis­connected.)

Jumper wire ( : Short : Open)

For product

Spare parts

Indoor controller board type

JP3

: With JP3
: Without JP3

MODEL

SETTING

PKA-A·HA6

MODEL

SETTING

PKA-A18HA6

ON
OFF

1 2 3 4 5

ON
OFF

1 2 3 4 5

ON
OFF

1 2 3 4 5

PKA-A12HA6

The black square (■) indicates a switch position.

OCH580

29

10

SPECIAL FUNCTION

Note:

· When the uint is restarted to operate after turning off the power or OFF operation, the unit which was operating will start oper­ation.

· To operate the main unit, refer to "10-1-2. How to set rotation function (Back-up function, 2nd stage cut-in function)", and set
the request code No. which is not the same as the current one, and set again the former request code No.

(2) 2nd stage cut-in function

Outline of functions

· When the 1st unit can NOT supply with sufficient capacity for exceptionally high-demand conditions and the actual room
temperature reaches set point *, the 2nd unit starts operation in conjunction with the 1st unit.

· Once the actual room temperature goes down to 7.5°F [4:] below set point*, the 2nd unit stops operation automatically.
(* set point = set temperature by R/C (remote controller) + 7.5, 10.8, 14.4°F [4, 6, 8:] (selectable))

· Number of operating units is determined according to the room temperature and set point.

· When room temperature becomes higher than set point, standby unit starts. (2 units operation)

· When room temperature falls below set point −7.5°F [−4:], standby unit stops. (1 unit operation)

10-1. Rotation Function (and back-up function, 2nd stage cut-in function)

This function is only available when using wired remote controller.

10-1-1. Operation

(1) Rotation function (and Back-up function)

Outline of functions

· Main and sub units operate alternately according to the interval of rotation setting.
Note: Main and sub unit should be set by refrigerant address. (Outdoor DIP switch setting)

Refrigerant address "00"

Main unit

Refrigerant address "01"

Sub unit

· When error occurs to one unit, another unit will start operation. (Back-up function)

System constraint

· This function is available only by the grouping control system (INDOOR UNIT: OUTDOOR UNIT=1:1) of 2 refrigerant
groups. (Refer to Fig. 1)

· Main indoor unit should be connected for wired remote controller and the transmission line (TB5) for main and sub unit
should also be connected. (Refer to Fig. 1)

(This function cannot be set by IR wireless remote controller.)

· Set refrigerant address of each unit. (DIP switch on the outdoor unit ··· Refrigerant address 00/01)

Operation pattern

OC-1

OC-2

IC-1

IC-2

3(2)

3(2)

2

RC

2

Main
unit

Sub
unit

Refrigerant address
"01"

Refrigerant address
"00"

Fig. 1

1 [Back-up function only]··· Request code number "312"

2

[Rotation function] & [Back-up function]··· Request code number "313–318"

(Ex:When the request code number is "313", each unit operates alternately in daily cycle.)

Error occurs on main unit.

Start operation

Run

Abnormal condition

Stop

Run

Main

unit

IC-1

Sub

unit

IC-2

Error occurs on main unit.

Start operation

1–28 days 1–28 days

Run

Abnormal condition

Stop

Stop

Run

Run

Stop Run

Main

unit

IC-1

Sub

unit

IC-2

Main Sub

Main Sub Sub Main Main Sub

OC : Outdoor unit
IC : Indoor unit
RC : Wired remote controller

OCH580

30

System constraint

· This function is available only in cooling mode.

Ex.) Set temp. by R/C = 68°F [20:]

Set point = 79°F [26:]
When request code number is “323”.

79°F 2nd unit Cut-in

7.5°F

71.5°F 2nd unit Cut-out

68°F

10-1-2. How to set rotation function (Back-up function, 2nd stage cut-in function)

You can set these functions by wired remote controller. (Maintenance monitor)

Both main and sub unit should be set in same setting.
Every time replacing indoor controller board for servicing, the function should be set again.

NOTE

Setting No.

(Request code)

Setting contents

Initial

setting

No.1
(310)

Monitoring the request code of current setting

No.2
(311)

Rotation and Back-up OFF (Normal group control operation)

No.3
(312)

Back-up function only

No.4
(313)

Rotation ON (Alternating interval = 1day) and back up function

No.5
(314)

Rotation ON (Alternating interval = 3day) and back up function

No.6
(315)

Rotation ON (Alternating interval = 5day) and back up function

No.7
(316)

Rotation ON (Alternating interval = 7day) and back up function

No.8
(317)

Rotation ON (Alternating interval = 14day) and back up function

No.9
(318)

Rotation ON (Alternating interval = 28day) and back up function

Setting No.

(Request code)

Setting contents

Initial

setting

No.1
(320)

Monitoring the request code of current setting

No.2
(321)

Cut-in function OFF

No.3
(322)

Cut-in Function ON(Set point = Set temp.+ 7.5°F [4°C])

No.4
(323)

Cut-in Function ON(Set point = Set temp.+ 10.8°F [6°C])

No.5
(324)

Cut-in Function ON(Set point = Set temp.+ 14.4°F [8°C])

(1) Request Code List

Rotation setting

2nd stage cut-in setting

[2nd stage cut-in function]··· Request code number "322–324"

Start operation Sub unit start operation

Room temp. ] Set point

Sub unit stop

Run

Stop StopRun

Main

unit
IC-1

Sub
unit
IC-2

Room temp. < Set point −7.5°F [−4:]

[20:]

[22:]

[4:]

[26:]

OCH580

31

10-2. BACK-UP HEATING FUNCTION (CN152)

10-2-1. Operation

Outline of functions

The back-up heater signal is sent out according to the tempera­ture difference between indoor room temperature and set tem­perature. This function is available only in heating operation.

10-2-2. How to connect

When connecting to the connector CN152 of the indoor unit, use
PAC-SE59RA-E(optional parts).

Z [ 0˚C [˚F]

0 < Z < 2.5˚C [4.5˚F]

2.5˚C [4.5˚F] [ Z

OFF

Keeping condition

ON

1

2

3

Temperature difference

[Z=Set temp. - Room temp.]

Back-up heater

signal output

Z 0 2.5˚C [4.5˚F]

OFF

ON

1

Press the button.

2

Select "Service" with the [Cursor] buttons (

F1

andF2) or the [Page] buttons (

F3

andF4), and press the button.

PAR-31MAA

F1 F2 F3 F4

Main menuMain 3/3

Main display:

Cursor Page

Maintenance
Initial setting
Service

Service menu

Select:

Cursor

Enter maintenance password

9999

Service menu 1/2

Main menu:

Cursor

Test run
Input maintenance info.
Function setting
Check
Self check

Check menu 1/1

Service menu:

Cursor

Error history
Refrigerant volume check
Refrigerant leak check
Smooth maintenance
Request code

Request code

Request:

Cursor

Ref.address 0
Request code 004

3

Enter the current maintenance password (4 numerical digits).

• Move cursor to the digit you wat to change with the F1orF2 button.

• Set each number (0 through 9) with the

F3

or

F4

button.

(Note: The initial maintenance password is "9999".)

4

Then, press the button.

5

Select "Check" with theF1orF2 button, and press the button.

6

Select "Request code" with theF1orF2 button, and press the button.

7

Set the Refrigerant address and Request code.

• Select the item to be changed with the

F1orF2

button.

• Select the required setting with the

F3

or

F4

button.

8

Press the F3or

F4

button to set the Refrigerant address "0".

9

Press the F3or

F4

button to set the desired request code No.

• Rotation & Back up operation: Enter one request code from 311–318.

• 2nd stage cut-in operation: Enter one request code from 321–324.

0

Press the button. Data will be collected and displayed.

1

Press the F3orF4 button to set the Refrigerant address "1".

Set above

9–0

.

2

To return to the Main menu, press the button.

(2) Rotation and back up operation

OCH580

32

DISASSEMBLY PROCEDURE

11

Be careful when removing heavy parts.

Push

Push

Down

Be careful
not to damage
the airflow
adjustment
plate with the
screw driver.

Corner hole

1. REMOVING THE LOWER SIDE OF THE INDOOR
UNIT FROM THE INSTALLATION PLATE

(1) Remove the front panel.
(2) Insert the screw driver to the corner hole at both left and

right side as shown in the figure 1.
(3) Push it up, then pull down the lower side of indoor unit and
remove the hook.

Figure 1

2. REMOVING THE FRONT PANEL

(1) Press and unlock the knobs on both sides of the front

panel and lift the front panel until it is level. Pull the hinges
forward to remove the front panel. (See Photo 2)

(2) Move the horizontal vanes in a downward direction.
(3) Remove the screw caps of the panel. Remove the screws.
(See Photo 1)
(4) Hold the lower part of both ends of the panel and pull it

slightly toward you, and then remove the panel by pushing
it upward.

Photo 1

Front panel

Screw caps

Vanes

Photo 2

PKA-A12HA6 PKA-A18HA6

PHOTOS & ILLUSTRATIONSOPERATION PROCEDURE

OCH580

3333

4. REMOVING THE ELECTRICAL BOX

(1) Remove the front panel. (Refer to step 2)

(2) Remove the electrical box covers. (See Photo 3)
(3) Remove the nozzle assembly. (Refer to step 5)
(4) Disconnect the connecting wire from terminal block (TB4)

and terminal block for MA-remote controller (TB5).
(5) Disconnect the connectors on the indoor controller board.
(6) Disconnect the connector for the ground wire. (See Photo 5)
(7) Pull the disconnected lead wire out from the electrical box.
(8) Remove the screw of electrical box. (See Photo 6)
(9) Push up the upper fixture (See Photo 5) catch to remove

the box, then pull the right fixture (See Photo 4) and
remove it from the box fixture.

Photo 5

Connector for
ground wire

Photo 6

Screw
(Electrical box)

Photo 3

3. REMOVING THE INDOOR CONTROLLER BOARD
AND IR WIRELESS CONTROLLER BOARD

(1) Remove the front panel. (Refer to step 2)
(2) Remove the room temp. thermistor TH1. (see Photo 3)
(3) Remove the electrical box covers (screw 4 × 12).
(See Photo 3)
(4) Disconnect the connectors on the indoor controller board.
(5) Remove the switch board cover.
(6) Pull out the indoor controller board toward you, then
disconnect the rest of connectors.
Remove the indoor controller board and switch board.
(7) Remove the holder of IR wireless controller board.
(8) Disconnect the connector of IR wireless controller board

and remove the IR wireless controller board from the
holder.

Indoor controller board (I.B)

Terminal
block (TB4)

Photo 4

Fixture
(right)

Fixture
(upper)

Terminal
block (TB5)

Terminal
block (TB4)

Electrical box
cover (top)

Electrical box
cover (side)

Screw (side cover)

Holder of IR wireless
controller board

Screw
(side cover)

Switch holder

Nozzle assembly

Screw (top cover)

Room temp.
thermistor
(TH1)

Thermistor
holder

PHOTOSOPERATION PROCEDURE

OCH580

34

5. REMOVING THE NOZZLE ASSEMBLY (with VANE
and VANE MOTOR) AND DRAIN HOSE

(1) Remove the front panel (Refer to step 2).
(2) Remove the electrical box cover.
(3) Disconnect the vane motor connector (CN151) on the
indoor controller board.
(4) Remove the corner box.
(5) Pull the nozzle assembly and detach.
(6) Push the fixture and remove the drain hose.

6. REMOVING THE INDOOR FAN MOTOR AND THE
LINE FLOW FAN

(1) Remove the front panel (Refer to step 2) and the corner

box at right lower side.

(2) Remove the electrical box (Refer to step 4) and the nozzle

assembly (Refer to step 5).
(3) Remove the screws fixing the motor bed. (See Photo 8)
(4) Loosen the screw fixing the line flow fan. (See Photo 9)
(5) Remove the motor bed together with fan motor and motor

band.
(6) Release the hooks of the motor band. Remove the motor

band. Pull out the indoor fan motor.
(7)

Remove the screws fixing the left side of the heat exchanger.
(See Photo 10)
(8) Lift the heat exchanger, and pull out the line flow fan to the

lower-left.

Photo 8

Photo 9

7. REMOVING THE VANE MOTOR

(1) Remove the nozzle assembly. (Refer to step 5)
(2) Remove the screws of the vane motor unit, and pull out

the vane motor unit.
(3) Remove the screws of the vane motor unit cover.
(4) Remove the vane motor from the vane motor unit.
(5) Disconnect the connector from the vane motor.

Photo 7

Screw of the
line flow fan

Photo 10

Screws of the
left side of the
heat exchanger

Electrical box cover (top)

Electrical box cover (side)

Screw (side cover)

Screw (top cover)

Switch board cover

Holder of
IR wireless
controller board

Nozzle assembly

Screws of the vane
motor unit

Screws of the vane motor unit cover

Photo 11

Screw
(side
cover)

Screws of the motor bed

Heat
exchanger

Water cover

Motor band

PHOTOSOPERATION PROCEDURE

OCH580

35

8. REMOVING THE LIQUID PIPE THERMISTOR AND
COND/EVA TEMP. THERMISTOR

(1) Remove the front panel. (Refer to step 2)
(2) Remove the electrical box cover.
(3) Remove the motor band.
(4) Cut the wiring fixed band.
(5)

Remove the liquid pipe thermistor and cond/eva temp. ther-

mistor.
(6) Disconnect the connector (CN44) on the indoor
controller board.

Photo 12

Liquid pipe thermistor (TH2)

Condenser/evaporator temp.
thermistor (TH5)

Heat exchanger

9. REMOVING THE HEAT EXCHANGER

(1) Remove the front panel (Refer to step 2) and the corner

panel at right lower side.
(2) Remove the electrical box (Refer to step 4) and the nozzle
assembly (Refer to step 5).
(3) Remove the motor band.
(4) Remove the pipe thermistors (Refer to step 8).
(5) Disconnect the connector (CN60) on the indoor controller
board and the connector for ground wire. (See Photo 5)
(6) Remove the screws fixing the left side of the heat
exchanger. (See Photo 9)
(7) Remove the heat exchanger.

10. REMOVING THE ROOM TEMPERATURE THERMISTOR

(1) Remove the front panel (Refer to step 2).
(2) Remove the electrical box cover.
(3) Remove the room temperature thermistor.
(4) Disconnect the connector (CN20) on the indoor controller
board.

Photo 13

Photo 14

Electrical box cover (top)

Electrical box cover (side)

Screw (side cover)

Screw (top cover)

Switch board cover

Holder of
IR wireless
controller board

Nozzle assembly

Water cover

Screw
(side
cover)

Heat exchanger

Electrical box
cover (top)

Electrical box
cover (side)

Screw (side cover)

Screw
(side cover)

Switch holder

Nozzle assembly

Screw (top cover)

Room temp.

thermistor
(TH1)

Thermistor
holder

Holder of
IR wireless
controller board

PHOTOSOPERATION PROCEDURE

OCH580

HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

CCopyright 2014 MITSUBISHI ELECTRIC CORPORATION
Distributed in Dec. 2014 No. OCH580
Made in Japan

New publication, effective Dec. 2014
Specifications are subject to change without notice.