Mitsubishi OC406 Service Manual

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

ON/OFF

TEMP.

TECHNICAL & SERVICE MANUAL

June 2006

No. OC406

Series PLH

Indoor unit
[Model names]

PLH-1.6KAKH

PLH-2KAKH

PLH-2.5KAKH

PLH-1.6KAK

PLH-2KAK

PLH-2.5KAK

INDOOR UNIT

Ceiling Cassettes

[Service Ref.]

PLH-1.6KAKH.UK
PLH-2KAKH.UK
PLH-2.5KAKH.UK
PLH-1.6KAK.UK
PLH-2KAK.UK
PLH-2.5KAK.UK

REMOTE CONTROLLER

• This manual does not cover
the outdoor units.
When servicing outdoor units
please refer to the outdoor
unit`s service manual No.
OC325 together with this
manual.

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

CONTENTS

1. REFERENCE MANUAL ·······················2

2. PART NAMES AND FUNCTIONS········2

3. SPECIFICATIONS·································4

4. DATA·····················································7

5. OUTLINES AND DIMENSIONS··········12

6. WIRING DIAGRAM ·····························14

7.

REFRIGERANT SYSTEM DIAGRAM

8. TROUBLESHOOTING························16

9. FUNCTION SETTING ·························30

10. 4-WAY AIR FLOW SYSTEM···············36

11. SYSTEM CONTROL···························37

12. DISASSEMBLY PROCEDURE···········51

13. RoHS PARTS LIST·····························54

14. OPTIONAL PARTS·····························58

······15

Disperses airflow up and
down and adjusts the angle
of airflow direction.

Grille

Filters
Removes dust and pollutants
from intake air

Sets airflow to horizontal automatically
during cooling or dehumidifying.

Air Intake
Intakes air from room.

Horizontal Air Outlet

Auto Air Swing Vane

1

Service Ref. Service Manual No.

PUH-1.6/2/2.5/3VKA.TH
PUH-3YKA.TH
PUH-4/5/6YKSA.TH

OC325

REFERENCE MANUAL

OUTDOOR UNIT’S SERVICE MANUAL

2

PART NAMES AND FUNCTIONS

● Indoor Unit

PLH-1.6KAKH.UK PLH-1.6KAK.UK
PLH-2KAKH.UK PLH-2KAK.UK
PLH-2.5KAKH.UK PLH-2.5KAK.UK

2

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Set Temperature buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
door.

ON/OFF button

Fan Speed button

Filter button
(<Enter> button)

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

To preceding operation
number.

Ventilation button
(

Operation button)

To next operation number.

● Wired remote controller

For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.

˚F˚C

˚F˚C

ERROR CODE

AFTER

TIMER

TIME SUN MON TUE WED THU FRI SAT

ON
OFF

Hr
AFTER

FILTER

FUNCTION

ONLY1Hr.

WEEKLY

SIMPLE

AUTO OFF

Identifies the current operation

Shows the operating mode, etc.
* Multilanguage display is sup-

ported.

“Centrally Controlled” indicator

Indicates that operation of the re­mote controller has been prohib­ited by a master controller.

“Timer Is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, shows the time
remaining.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

Comes on when it is time to clean the
filter.

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Up/Down Air Direction indica­tor

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to
weak and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di­rection also changes.

Room Temperature display

Shows the room temperature.

Louver display

Indicates the action of the swing
louver. Does not appear if the
louver is stationary.

(Power On indicator)

Indicates that the power is on.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

● Operation buttons

● Display

Caution

● Only the Power on indicator lights when the unit is stopped and power supplied to the unit.

● If you press a button for a feature that is not installed at the indoor unit, the remote controller will display the “Not Available”

message.
If you are using the remote controller to drive multiple indoor units, this message will appear only if he feature is not
present at the parent unit.

● When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indica­tion (For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.

3

SPECIFICATIONS3

Service Ref.

Item

Btu/h

W

kW

kW

A
A

kW

K/min(CFM)

mmAq,Pa

kW

dB(A)
mm,(in.)
mm,(in.)
mm,(in.)
mm,(in.)

kg,(lbs)

kW

A
A

kW

kW

K

/min(CFM

)

dB(A)
mm,(in.)
mm,(in.)
mm,(in.)

kg,(lbs)

kg,(lbs)
mm,(in.)
mm,(in.)

Function
Capacity
Total input

Service Ref.

Power supply (phase, cycle, voltage)

Input
Running current

Starting current
External finish
Heat exchanger

Fan (drive) o No.

Fan motor output

Airflow (Low-High)

External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-High)
Cond. drain conn. O.D.

Dimensions

Weight

Service Ref.

Power supply (phase, cycle, voltage)

Input

Running current

Starting current
External finish
Refrigerant control
Compressor

Model

Motor output

Starter type

Protection devices
Heat exchanger

Fan (drive) o No.

Fan motor output

Airflow
Defrost method
Noise level

Dimensions

Weight
Refrigerant

Charge
Pipe size O.D.

Connection method

Between the indoor &
outdoor unit

INDOOR UNITOUTDOOR UNIT

REFRIGERANT PIPING

PLH-1.6KAK.UK/ PLH-1.6KAKH.UK

Cooling

15,000

4,400

1.59

0.15

0.64

0.70

UNIT : 660(26)
UNIT : 660(26)
UNIT : 253(10)

UNIT : 19(42)[20(44)]

1.44

6.74

Heating

15,900[20,600]

4,650[6,050]

1.51[3.20]

0.10[1.50]

0.45[6.28]

0.50[6.91]

PANEL : 760(30)
PANEL : 760(30)

PANEL : 30(1-1/8)

PANEL : 3.7(8)[3.7(8)]

1.41

6.60

W

D
H

W

D
H

Liquid

Gas
Indoor side
Outdoor side
Height difference
Piping length

PLH-1.6KAK.UK/ PLH-1.6KAKH.UK

Single, 50Hz, 220-240V

Galvanized sheets with gray heat insulation

Plate fin coil

Turbo fan [direct) o 1

0.030

13-16(460-565)

0(direct blow)

[1.4]

Remote controller & built-in

32-37

32(1-1/4)

PUH-1.6VKA.TH

Single, 50Hz, 220-240V

33

Munsell 3.0Y 7.8/1.1

Capillary tube

Hermetic

RH247VFCT

1.2

Line start

Inner thermostat, High pressure switch

Plate fin coil

Propeller (direct) o 1

0.065

45(1,590)

Reverse cycle

49

870(34-1/4)

295+24 (11-5/8 and 1)

650 (25-5/8)

53(117)

R-22

2.2(4.8)

9.52 (3/8)

15.88 (5/8)
Flared
Flared

Max. 40m
Max. 40m

Note: Rating condition (ISO T1<JIS B8616>)

Cooling : indoor : D.B. 27:, W.B. 19:
Heating : indoor : D.B. 20:
Refrigerant piping length (one way) : 5m (16ft)

outdoor : D.B. 35:, W.B. 24:
outdoor : D.B. 7:, W.B. 6:

4

Item

Function
Capacity
Total input

Service Ref.

Power supply (phase, cycle, voltage)

Input
Running current

Starting current
External finish
Heat exchanger

Fan (drive) o No.

Fan motor output

Airflow (Low-High)

External static pressure
Booster heater
Operation control & Thermostat

INDOOR UNITOUTDOOR UNIT

Noise level (Low-High)
Cond. drain conn. O.D.

W

Dimensions

D
H

Weight

Service Ref.

Power supply (phase, cycle, voltage)

Input

Running current

Starting current
External finish
Refrigerant control
Compressor

Model

Motor output

Starter type

Protection devices
Heat exchanger

Fan (drive) o No.

Fan motor output

Airflow
Defrost method
Noise level

W

Dimensions

D

H
Weight
Refrigerant

Charge

Pipe size O.D.

Connection method
Between the indoor &

outdoor unit

REFRIGERANT PIPING

Note: Rating condition (ISO T1<JIS B8616>)

Cooling : indoor : D.B. 27:, W.B. 19:
Heating : indoor : D.B. 20:
Refrigerant piping length (one way) : 5m (16ft)

outdoor : D.B. 35:, W.B. 24:
outdoor : D.B. 7:, W.B. 6:

Liquid

Gas
Indoor side
Outdoor side
Height difference
Piping length

Service Ref.

Btu/h

W

kW

kW

A
A

kW

K/min(CFM)

mmAq,Pa

kW

dB(A)
mm,(in.)
mm,(in.)
mm,(in.)
mm,(in.)

kg,(lbs)

kW

A
A

kW

kW

/min(CFM

K

dB(A)
mm,(in.)
mm,(in.)
mm,(in.)

kg,(lbs)

kg,(lbs)
mm,(in.)
mm,(in.)

PLH-2KAK.UK/ PLH-2KAKH.UK

Cooling

18,400

5,400

2.34

Heating

19,800[24,600]

5,800[7,200]

2.32[4.09]

PLH-2KAK.UK/ PLH-2KAKH.UK

Single, 50Hz, 220-240V

0.14

0.65

0.72

0.10[1.50]

0.45[6.28]

0.50[6.91]

Galvanized sheets with gray heat insulation

Plate fin coil

Turbo fan (direct) o 1

0.030

13-16(460-565)

0(direct blow)

[1.4]

Remote controller & built-in

32-37

32(1-1/4)
UNIT : 660(26)
UNIT : 660(26)
UNIT : 253(10)

UNIT : 19(42)[20(44)]

PANEL : 760(30)
PANEL : 760(30)

PANEL : 30(1-1/8)

PANEL : 3.7(8)[3.7(8)]

PUH-2VKA.TH

Single, 50Hz, 220-240V

2.20

9.86
45

2.22

9.95
45

Munsell 3.0Y 7.8/1.1

Capillary tube

Hermetic

NH38VMDT

1.7

Line start

Inner thermostat, HP switch

Plate fin coil

Propeller (direct) o 1

0.065

)

45(1590)

Reverse cycle

49

870(34-1/4)

295+24 (11-5/8 add 1)

650 (25-5/8)

64(141)

R-22

2.2(4.8)

9.52 (3/8)

15.88 (5/8)
Flared
Flared

Max. 40m
Max. 40m

5

Service Ref.

Item

Btu/h

W

kW

kW

A
A

kW

K/min(CFM)

mmAq,Pa

kW

dB(A)
mm,(in.)
mm,(in.)
mm,(in.)
mm,(in.)

kg,(lbs)

kW

A
A

kW

kW

K

/min(CFM

)

dB(A)
mm,(in.)
mm,(in.)
mm,(in.)

kg,(lbs)

kg,(lbs)
mm,(in.)
mm,(in.)

Function
Capacity
Total input

Service Ref.

Power supply (phase, cycle, voltage)

Input
Running current

Starting current
External finish
Heat exchanger

Fan (drive) o No.

Fan motor output

Airflow (Low-High)

External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-High)
Cond. drain conn. O.D.

Dimensions

Weight

Service Ref.

Power supply (phase, cycle, voltage)

Input

Running current

Starting current
External finish
Refrigerant control
Compressor

Model

Motor output

Starter type

Protection devices
Heat exchanger

Fan (drive) o No.

Fan motor output

Airflow
Defrost method
Noise level

Dimensions

Weight
Refrigerant

Charge
Pipe size O.D.

Connection method
Between the indoor &

outdoor unit

INDOOR UNITOUTDOOR UNITREFRIGERANT

PLH-2.5KAK.UK/ PLH-2.5KAKH.UK

Cooling

21,500

6,300

2.60

0.14

0.61

0.67

UNIT : 660(26)
UNIT : 660(26)
UNIT : 253(10)

UNIT : 20(44)[21(46)]

2.46

10.68
52

Heating

24,600[31,700]

7,200[9,300]

2.33[4.87]

0.10[2.20]

0.45[9.20]

0.50[10.12]

PANEL : 760(30)
PANEL : 760(30)

PANEL : 30(1-1/8)

PANEL : 3.7(8)[3.7(8)]

2.23

9.78
52

W

D
H

W

D
H

Liquid

Gas
Indoor side
Outdoor side
Height difference
Piping length

PLH-2.5KAK.UK/ PLH-2.5KAKH.UK

Single, 50Hz, 220-240V

Galvanized sheets with gray heat insulation

Plate fin coil

Turbo fan (direct) o 1

0.030

14-17(495-600)

0(direct blow)

[2.1]

Remote controller & built-in

35-39.5

32(1-1/4)

PUH-2.5VKA.TH

Single, 50Hz, 220-240V

Munsell 3.0Y 7.8/1.1

Capillary tube

Hermetic

NH41VMDT

2.0

Line start

Inner thermostat, HP switch

Plate fin coil

Propeller (direct) o 1

0.085

50(1764)

Reverse cycle

52

870(34-1/4)

295+24 (11-5/8 add 1)

850(34-1/4)

68(150)

R-22

2.8(6.2)

9.52(3/8)

15.88 (5/8)
Flared
Flared

Max. 50m
Max. 50m

Note: Rating condition (ISO T1<JIS B8616>)

Cooling : indoor : D.B. 27:, W.B. 19:
Heating : indoor : D.B. 20:
Refrigerant piping length (one way) : 5m (16ft)

outdoor : D.B. 35:, W.B. 24:
outdoor : D.B. 7:, W.B. 6:

6

4

Service Ref.

PLH-1.6KAK.UK
PLH-1.6KAKH.UK/
PUH-1.6VKA.TH

PLH-2KAK.UK
PLH-2KAKH.UK/
PUH-2VKA.TH

PLH-2.5KAK.UK
PLH-2.5KAKH.UK/
PUH-2.5VKA.TH

Indoor

intake

air

WB:

16
18
20
22
16
18
20
22
16
18
20
22

CA P.C. CA P.C. CA P.C. CA P.C. CA P.C. CA P.C.

20 25 30 35 40 45

Outdoor intake air DB:

4439

1.27 4317 1.33 4159 1.43 3990 1.53 3812 1.64 3624

1.74

4726

1.30 4602 1.36 4434 1.46 4258 1.57 4074 1.68 3882

1.79

5017

1.32 4899 1.38 4724 1.50 4542 1.61 4352 1.72 4154

1.84

5310

1.35 5209 1.41 5028 1.53 4840 1.65 4645 1.77 4442

1.90

5448

1.88 5299 1.96 5104 2.11 4897 2.26 4678 2.41 4447

2.56

5800

1.91 5648 2.00 5442 2.15 5226 2.31 5000 2.47 4764

2.63

6157

1.95 6012 2.04 5798 2.20 5574 2.37 5341 2.54 5099

2.71

6517

1.99 6392 2.08 6171 2.25 5940 2.42 5700 2.61 5451

2.80

6356

2.08 6182 2.17 5955 2.34 5713 2.51 5458 2.68 5189

2.85

6767

2.13 6589 2.22 6349 2.39 6097 2.57 5834 2.75 5558

2.92

7183

2.17 7014 2.26 6764 2.45 6503 2.63 6231 2.82 5948

3.01

7603

2.21 7458 2.31 7199 2.50 6930 2.69 6650 2.90 6360

3.11

DATA

4-1. PERFORMANCE DATA 50Hz

1) COOLING CAPACITY

Note CA:Capacity (W)

P.C. :Power consumption (kW)

Cooling capacity correction factors

Service Ref.

PLH-1.6
KAK/KAKH.UK
PLH-2
KAK/KAKH.UK
PLH-2.5
KAK/KAKH.UK

Refrigerant piping length (one way)

5m 10m 15m 20m 25m 30m 35m 40m 45m 50m

1.00 0.993 0.984 0.978 0.969 0.961 0.956 0.948 — —

1.00 0.992 0.983 0.978 0.966 0.959 0.950 0.945 — —

1.00 0.989 0.980 0.970 0.960 0.950 0.940 0.930 0.920 0.910

7

-5

CA P.C. CA P.C. CA P.C. CA P.C. CA P.C. CA P.C.
3184 1.03 3650 1.14 4160 1.25 4714 1.38 5312 1.51 5952 1.64
3049 1.11 3506 1.23 4003 1.35 4538 1.48 5112 1.62 5724 1.77
2930 1.18 3364 1.31 3844 1.44 4370 1.59 4942 1.74 5560 1.90
3972 1.58 4552 1.75 5188 1.93 5880 2.11 6625 2.31 7424 2.52
3803 1.71 4373 1.89 4993 2.08 5661 2.28 6376 2.49 7139 2.71
3655 1.81 4196 2.01 4795 2.22 5451 2.44 6165 2.67 6935 2.91
4109 1.56 4709 1.73 5367 1.90 6083 2.09 6854 2.28 7680 2.49
3934 1.68 4524 1.86 5165 2.05 5856 2.25 6596 2.46 7386 2.68
3781 1.79 4341 1.98 4960 2.19 5639 2.41 6377 2.64 7174 2.87

Service Ref.

PLH-1.6KAK.UK
PLH-1.6KAKH.UK/
PUH-1.6VKA.TH

PLH-2KAK.UK
PLH-2KAKH.UK/
PUH-2VKA.TH

PLH-2.5KAK.UK
PLH-2.5KAKH.UK/
PUH-2.5VKA.TH

Indoor

intake

air

DB:

15
20
25
15
20
25
15
20
25

-10 0 5 10 15

Outdoor intake air WB:

Cooling performance curve(50Hz)

1.4

1.2

1.0

0.8

0.6

1.4

1.2

1.0

0.8

0.6

0.4

-5 5 15 253546
OUTDOOR D.B.(°C)

TOTAL INPUT (RATIO) CAPACITY (RATIO)

INDOOR W.B.(°C)

INDOOR W.B.(°C)

22
20
18
16

22
20
18
16

1.4

1.2

1.0

0.8

0.6

1.4

1.2

1.0

0.8

0.6

0.4

-5 5 15 253546
OUTDOOR D.B.(°C)

TOTAL INPUT (RATIO) CAPACITY (RATIO)

INDOOR W.B.(°C)

INDOOR W.B.(°C)

22
20
18
16

22
20
18
16

2) HEATING CAPACITY

Heating performance curve(50Hz)

Note CA:Capacity (W)

P.C. :Power consumption (kW)

Heating capacity correction factors

Service Ref.

PLH-1.6
KAK/KAKH.UK
PLH-2
KAK/KAKH.UK
PLH-2.5
KAK/KAKH.UK

5m 10m 15m 20m 25m 30m 35m 40m 45m 50m

1.00 1.00 1.00 1.00 1.00 1.00 0.998 0.995 — —

1.00 1.00 1.00 1.00 1.00 1.00 0.998 0.995 — —

1.00 1.00 1.00 1.00 1.00 1.00 0.998 0.995 0.993 0.990

Refrigerant piping length (one way)

8

4-2. ELECTRICAL DATA

Indoor unit …220V 50Hz 1phase
Outdoor unit…220V 50Hz 1phase

Service Ref.

Mode
Capacity (W)
Total Input (kW)

Input (kW)
Current (A)
Starting current (A)

Indoor unit

Input (kW)
Current (A)
Starting current (A)

Outdoor unit

Indoor unit …230V 50Hz 1phase
Outdoor unit…230V 50Hz 1phase

Service Ref.

Mode
Capacity (W)
Total Input (kW)

Input (kW)
Current (A)
Starting current (A)

Indoor unit

Input (kW)
Current (A)
Starting current (A)

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

PLH-1.6KAK/ KAKH.UK

PUH-1.6VKA.TH

Cool

4,300

1.48

0.12

0.60

0.66

1.36

6.79
30

Heat

4,550

[5,720]

1.40

[2.57]

0.08

[1.25]

0.41

[5.75]

0.45

[6.33]

1.32

6.59
30

PLH-1.6KAK/ KAKH.UK

PUH-1.6VKA.TH

Cool

4,350

1.54

0.14

0.62

0.68

1.40

6.76
32

Heat

4,600

[5,890]

1.45

[3.01]

0.09

[1.38]

0.43

[6.02]

0.47

[6.62]

1.36

6.57
32

PLH-2KAK/ KAKH.UK

PUH-2VKA.TH

Cool

5,300

2.24

0.12

0.61

0.67

2.12

9.83
43

Heat

5,700

[6,870]

2.22

[3.73]

0.08

[1.25]

0.42

[5.76]

0.46

[6.34]

2.14

9.93
43

PLH-2KAK/ KAKH.UK

PUH-2VKA.TH

Cool

5,350

2.29

0.13

0.63

0.69

2.16

9.78
44

Heat

5,750

[7,040]

2.27

[3.92]

0.09

[1.38]

0.44

[6.03]

0.48

[6.63]

2.18

9.87
44

PLH-2.5KAK/ KAKH.UK

PUH-2.5VKA.TH

Cool

6,200

2.53

0.12

0.57

0.63

2.41

11.18
52

Heat

6,900

[8,660]

2.25

[4.41]

0.09

[1.85]

0.46

[9.28]

0.80

[8.79]

2.16

10.02
52

PLH-2.5KAK/ KAKH.UK

PUH-2.5VKA.TH

Cool

6,250

2.57

0.13

0.59

0.65

2.44

10.94
52

Heat

7,050

[8,980]

2.29

[4.64]

0.09

[2.02]

0.43

[8.82]

0.47

[9.70]

2.20

9.86
52

Indoor unit …240V 50Hz 1phase
Outdoor unit…240V 50Hz 1phase

Service Ref.

Indoor unit
Outdoor unit

Mode
Capacity (W)
Total Input (kW)

Input (kW)
Current (A)
Starting current (A)

Indoor unit

Input (kW)
Current (A)
Starting current (A)

Outdoor unit

PLH-1.6KAK/ KAKH.UK

PUH-1.6VKA.TH

Cool

4,400

1.59

0.15

0.64

0.70

1.44

6.74
33

Heat

4,650

[6,050]

1.51

[3.20]

0.10

[1.50]

0.45

[6.28]

0.50

[6.91]

1.41

6.60
33

9

PLH-2KAK/ KAKH.UK

PUH-2VKA.TH

Cool

5,400

2.34

0.14

0.65

0.72

2.20

9.86
45

Heat

5,800

[7,200]

2.32

[4.09]

0.10

[1.50]

0.45

[6.28]

0.50

[6.91]

2.22

9.95
45

PLH-2.5KAK/ KAKH.UK

PUH-2.5VKA.TH

Cool

6,300

2.60

0.14

0.67

0.67

2.46

10.68
52

Heat

7,200

[9,300]

2.33

[4.87]

0.10

[2.20]

0.45

[9.20]

0.80

[9.55]

2.23

9.78
52

TotalElectrical circuitRefrigerant circuitIndoor side

Outdoor

side

Service Ref.

SHF

BF

W

kW

V
A

V
A

Mpa•G
Mpa•G

°C
°C
°C

m

DB°C

WB°C

DB°C
DB°C

WB°C

Mode

Capacity
Input

Indoor unit Service Ref.

Phases, Hz
Volts
Amperes

Outdoor unit Service Ref.

Phases, Hz
Volts
Amperes
Discharge pressure
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Ref. pipe length

Intake air temperature

Discharge air temperature

Intake air temperature

PLH-1.6KAK.UK

PLH-1.6KAKH.UK

PLH-1.6KAK.UK

PLH-1.6KAKH.UK

1,50

240

PUH-1.6VKA.TH

1,50

240

PLH-2KAK.UK

PLH-2KAKH.UK

PLH-2KAK.UK

PLH-2KAKH.UK

1,50

240

PUH-2VKA.TH

1,50

240

PLH-2.5KAK.UK

PLH-2.5KAKH.UK

PLH-2.5KAK.UK

PLH-2.5KAKH.UK

1,50

240

PUH-2.5VKA.TH

1,50

240

Cooling

4,400

1.59

0.64

6.74

1.80

0.54

78.7

48.5

8.5
5

27
19

16.1
35
24

0.83

0.21

Heating

4,650

1.51

0.45

6.60

1.70

0.40

77.2
—

0.7
5

20
15

35.2
7
6

—
—

Cooling

5,400

2.34

0.65

9.86

1.90

0.46

84.0

50.7

4.8
5

27
19

15.0
35
24

0.76

0.21

Heating

5800

2.32

0.45

9.95

1.94

0.34

86.4
—

-1.8
5

20
15

39.4
7
6

—
—

Cooling

6,300

2.60

0.61

10.68

1.95

0.50

82.8

51.8

6.7
5

27
19

13.8
35
24

0.75

0.14

(19.9)

(5.1)

(17.4)

(3.7)

(19.3)

(4.7)

(19.8)

(3.5)

(18.3)

(5.5)

(kgf/G•G)
(kgf/G•G)

(17.3)

(4.1)

Heating

7,200

2.33

0.45

9.78

1.71

0.36

76.0
—

-1.5

5
20
15

41.2
7
6

—
—

4-3. STANDARD OPERATION DATA

Air flow
Air speed
Coverage range



K/min

m/W.

m

PLH-1.6KAK/ KAKH.UK

PLH-2KAK/ KAKH.UK

16.0

5.6

6.0

PLH-2.5KAK/ KAKH.UK

17.0

5.9

6.4
Air flow
Air speed
Coverage range
Total width of discharge outlets

K/min

m/W.

m

mm

17.0

5.9

6.4
0

18.0

6.3

6.8
0

Standard

High ceiling

The unit of pressure has been changed to Mpa based on international SI system.
The conversion factor is : 1(Mpa.G)=10.2(kgf/

4-4. OUTLET AIR SPEED AND COVERAGE RANGE

W The air coverage range is the value up to the position where the air speed is 0.25m/sec.

When air is blown out horizontally from the unit at the Hi notch position.
The coverage range should be used only as a general guideline since it varies according to the size of the room and
the furniture inside the room.

.

ff

G)

10

4-5. NOISE CRITERION CURVES

Ambient temperature 27:

UNIT

1.5m

MICROPHONE

CEILING

PLH-1.6KAK.UK
PLH-1.6KAKH.UK
PLH-2KAK.UK
PLH-2KAKH.UK

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NOTCH

High

Low

SPL(dB)

37
32

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

PLH-2.5KAK.UK
PLH-2.5KAKH.UK

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NOTCH

High
Low

SPL(dB)

39.5
35

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

11

OUTLINES AND DIMENSIONS5

1

Refrigerant pipe

([ 9.52mm)

Flared connection

3/8F

2

Refrigerant pipe

([ 15.88mm)

Flared connection

5/8F

Ceiling hole

Suspension bolt pitch

Suspension bolt M10 or

Air intake hole

Air outlet hole

Air intake grill

690~710 25~3525~35

640

660

466

460

66 35

760

117 117

117

435

135

117

Ceiling hole

Suspension bolt pitch

Suspension bolt lower edge

Air outlet hole

Air outlet hole

690~710

25~35

25~35

65~80

760

460

466

6635

115

243

253

29830

54

+3

- 2

507

660

54

53

Terminal block for heater

Terminal block for
remote controller

Terminal block for
power supply

Drain hole

Drain hole
VP-25 connection

W3/8

Feeding hole
(Drain pump)

Leave space of 10~15mm between the
top surface of the unit and the ceiling slab.

Ceiling surface

4-Auto vanes

Intake grille opening/closing side

Vane motor

Decorative panel

Control wire entry

Refrigerant piping side
electric wire entry side

Power line entry

41 25

Liquid pipe

Gas pipe

Optional high-efficiency filter

NOTE 1.The electrical parts box may be removed during servicing.

When connecting the power line and the control wire, provide
enough length to the electric wires.

NOTE 2.When installing the optional high-efficiency filter, the dimension

between the transom and ceiling shall be more than 440mm.
Also, when installing the optional fresh air intake casement or
the multi-functional casement, the dimension between the
transom and ceiling shall be more than 440mm.
(The optional high-efficiency filter can also be installed.)

54

+3

- 2

INDOOR UNIT
PLH-1.6KAKH.UK PLH-2KAKH.UK PLH-2.5KAKH.UK
PLH-1.6KAK.UK PLH-2KAK.UK PLH-2.5KAK.UK

Unit : mm

12

WIRED REMOTE CONTROLLER

unit : mm

130

120

19

13

WIRING DIAGRAM6

1 2 3 4 5

O

N

O

F

F

MO

DELS

Table 2

SW

2

Manufacture/Service

PLH-1.6KAK
PLH-1.6KAKH

PL

H

-2

KAK

PL

H

-2

KAKH

1 2 3 4 5

O

N

O

F

F

PLH-2.5KAK
PLH-2.5KAKH

1 2 3 4 5

O

N

O

F

F

12345678

O

N

O

F

F

MODELS

SW5

Manufacture/Service

PLH-KAK
PLH-KAKH

Table 3

N

O

T

E

S

:

1. S

ym

b

ols used in w

iring diag

ra

m

above are, : C

onn

ector, : T

erm

inal (block).

2. Indoo

r and outdoor conn

ecting

w

ires are m

ade W

ith polarities, m

ake W

iring

m

a

tching

term

inal num

b

ers(1, 2

, 3).

3. S

in

ce the ou

tdoor side electric w

irin

g m

ay chang

e be su

re

to check the outdoor

unit electric w

iring for servicing.

ON
OFF

MO

DELS

Table 1

SW

1

Manufacture/Service

PLH-KAK

1 2 3 4 5

PLH-KAKH

P

le

ase

se

t th

e volta

ge

usin

g th

e

re

m

o

te

co

n

tro

lle

r.

F

o

r th

e

se

ttin

g m

e

th

o

d

.

p

le

a

se

re

fe

r to

th

e

in

d

o

or

u

nit Insta

lla

tio

n

M

an

u

a

l.

1
2

88H

FS1

FS2

H

1

5

3

R

ED

RED

BLU

W

H

T

TB2

L

N

PO

W

ER SUPPLY
~(1PHASE)
220-240V 50Hz
220V 60Hz

5
6

1

6

YLW

W

HT

GRY

26H

YLW

W

HT

HEATER

CN24

88H

SW6

1

2

ON
OFF

H2

1

2

3

3

2

1

MF

C

RED

WHT

BLK

2
1

3
2
1

CN2S

(WHT)

CNSK

(RED)

1
2
3

L
N

P.B

TB4

TB2

TB5

1

2

1

2

TB6

R.B

TRANSMISSION W

IRES DC12V

1
3

DS

TH1

1
2

TH2

5
3

1

13

1

3

1

2

3

1

2

1

3

1

3

1

2

1

3

FA

N

(WHT)

BC

R

VANE

C

N

V

(GRN)

D

.U

.M

C

N

P

(BLU)

D

.H

EA

TE

R

C

N

C

(RED)

C

N

90

(WHT)

C

N

41

C

N

2L

C

N

32

C

N

25

C

N

51

ZN

R

F

U

SE

X1

LED

2

LED

1

X3

X

4

1

2

1

2

1

2

1

2

2

1

3

D

.SEN

S

O

R

C

N

31

(W

H

T)

LIQ

U

ID

C

N

21

(W

H

T)

IN

TAK

E

C

N

20

(R

E

D

)

W

IR

E

LE

S

S

X4

X1

X3

O

N

O

FF

SW

E

SW

2

SW

1

S

W

5

I.B

D

P

2
7

5

10

1
6

MV

GRILLE

LS

DC13.1V

CN30
(BLK)

O

U

T

D

O

O

R

CN2D
(WHT)

POW

ER

C

N

D

K

(R

E

D

)

POWER

C

N

D

(O

R

N

)

POWER

Refer to tables 1, 2 and 3.

RED

W

H

T

RED
BLU

YLW
ORN
BRN

GRN/YLW

RED

BLU

BLK

W

HT

BLU

BLK

BLK

BLK

BLK

RED

RED

BLU

BRN

BRN

VANE
CN23

(GRN

)

To
o

utdoo

r

un

it

Y

LW

Y

LW

R

EM

O

C

O

N

C

N

22

(BLU

)

POWER SUPPLY
~(1PHASE)
220-240V 50Hz
220V 60Hz

[Self-diagnosis]

1.For details on how to operate self-diagnosis with the wireless remote control, refer to the
technical manuals etc.

2.For the wired remote control:When you quickly press twice the CHECK switch on the
remote control, the unit begins self-diagnosis.
and Check Codes generated in the past appear on the display.
For Check Codes and symptoms refer to the table below.

Check Code

P1
P2
P4
P5

Abnormality of room temperature thermistor (TH1).
Abnormality of pipe temperature thermistor/Liquid (TH2).
Abnormality of drain sensor (DS).
Malfunction of drain-up machine.

Symptom

P6

Freezing / overheating protection is working.

P8

E0-E5

Abnormality in outdoor unit. Refer to outdoor unit wiring diagram.
Abnormality of the signal transmission between remote controller and indoor unit.

----

FFFF

No trouble generated in the past.
No corresponding unit.

Fb

Abnormality of indoor controller board.

[Emergency operation procedure]

1.When the wired remote control or the indoor unit microcomputer has failed,but all other compornents work
if you set the switch (SWE, SW6) on the indoor control board, the indoor unit will begin properly
Emergency Operation.
WNote on the wireless remote control: when the remote control does not function, it is possible to
activate Emergency Operation by using the indoor unit emergency operation switch (SW1,SW2 of the
wireless signal receiver board).
However,if the indoor unit microcomputer has failed,it is nesessary to proceed with points 2 and
3 below as in the case of the wired remote controller.

2.When you activate emergency operation of the cooling or heating, you have to set the switch (SWE) and
switch (SW6) on the indoor controller.
SWE : ON • Indoor fan is running at high speed. • Drain-up machine is working.
SW6-1 : ON • Emergency operation of cooling mode.
SW6-1,2 : ON • Emergency operation of heating mode.

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-up machine 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,dose not function.
(3) Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation of
the heating is activated, because it will start to blow cold air.
(4) Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5) After emergency operation has been deactivated, set the switches etc.to their original positions.
(6) Movement of the vanes does not work in emergency operation, therefore you have to slowly set them
manually to the appropriate position.

SYMBOL NAME

HEATER

FS1

THERMAL FUSE(98;, 10A)

FS2

THERMAL FUSE(77;, 10A)

H1

HEATER

26H

HEATER THERMAL SWITCH

88H

HEATER CONTACTOR

SYMBOL NAME

MF

FAN MOTOR

MV

VANE MOTOR

LS

LIMIT SWITCH

H2

DEW PREVEMTION HEATER

DP

DRAIN-UP MACHINE

DS

DRAIN SENSOR

TB4

TERMINAL BLOCK(INDOOR/OUTDOOR CONNECTING LINE)

R.B

WIRED REMOTE CONTROLLER BOARD

TB2

TERMINAL BLOCK(POWER SUPPLY)

TB5,TB6

TERMINAL BLOCK(REMOTE CONTROLLER
TRANSMISSION LINE)

TH1

ROOM TEMP. THERMISTOR
(0;/15k', 25;/5.4k' DETECT)

TH2

PIPE TEMP. THERMISTOR/LIQUID
(0;/15k', 25;/5.4k' DETECT)

C

CAPACITOR(FAN MOTOR)

SYMBOL NAME

P.B

INDOOR POWER BOARD

I.B

INDOOR CONTROLLER BOARD

FUSE

FUSE(T6.3AL250V)

ZNR

VARISTOR

BCR

FAN CONTROL ELEMENT

CN2L

CONNECTOR(LOSSNAY)

CN32

CONNECTOR(REMOTE SWITCH)

CN41

CONNECTOR(HA TERMINAL-A)

CN51

CONNECTOR(CENTRALLY CONTROL)

LED1

POWER SUPPLY(I.B)

LED2

POWER SUPPLY(I.B)

X1

RELAY(DRAIN PUMP)

X4

RELAY(FAN MOTOR)

SW1

SWITCH(MODEL SELECTION)wSee table 1

SW2

SWITCH(CAPACITY CORD)wSee table 2

SW5

SWITCH(SYSTEM SELECTION)wSee table 3

SW6, SWE

CONNECTOR(EMERGENCY OPERATION)

SWE

CONNECTOR(EMERGENCY OPERATION)

[LEGEND]

PLH-1.6KAKH.UK PLH-2KAKH.UK PLH-2.5KAKH.UK
PLH-1.6KAK.UK PLH-2KAK.UK PLH-2.5KAK.UK

14

7

Indoor unit

Indoor
heat
exchanger

Refrigerant pipe
(option)

15.88

mm( 5/8")

(with heat insulator)

Flexible tube

Ball valve

Strainer

4-way valve

Oil separator

Service
port

Service
port

High pressure
control switch

Outdoor unit

Outdoor heat exchanger

Outdoor
coil
thermistor

(RT)

Capillary
tube

Restrictor
valve

Strainer

Bypass
valve

Compressor

Accumulator

Ball valve
(with service port)

Refrigerant pipe
(option)

9.52mm( 3/8")
(with heat insulator)

Capillary
tube

Restrictor
valve

Distributor
with
strainer

Indoor coil
thermistor
TH2

Strainer

Flared
connection

<R.V.coil>
Heating ON
Cooling OFF

PLH-1.6(O.D.3.2 ✕ I.D.1.6-R630)
PLH-2(O.D.3.2 ✕ I.D.1.8-R630)
PLH-2.5(O.D.3.2 ✕ I.D.1.8-R430)

Refrigerant flow in cooling
Refrigerant flow in heating

PUH-1.6(O.D.3.2 ✕ I.D.1.8-R430)
PUH-2(O.D.4.0 ✕ I.D.2.0-R430)
PUH-2.5(O.D.4.0 ✕ I.D.2.4-R1550)

REFRIGERANT SYSTEM DIAGRAM

PLH-1.6KAK.UK PLH-1.6KAKH.UK / PUH-1.6VKA.TH
PLH-2KAK.UK PLH-2KAKH.UK / PUH-2VKA.TH
PLH-2.5KAK.UK PLH-2.5KAKH.UK / PUH-2.5VKA.TH

Unit : mm

15

8

Unit conditions at service

Error code

Actions to be taken for service (summary)

The inferior phenomenon is
reoccurring.

Displayed

Not displayed

Judge what is wrong and take a corrective action
according to “SELF-DIAGNOSIS ACTION TABLE” (8-3).

Identify the cause of the inferior phenomenon and take
a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA ” (8-4).

The inferior phenomenon 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 and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
inferior phenomenon occurred, and wiring related.
2Reset error code logs and restart the unit after finishing
service.
3There is no abnormality in electrical components,
controller boards, and remote controller.

1Recheck the abnormal symptom.
2Identify the cause of the inferior phenomenon and take

a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA ” (8-4).
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality in electrical components,
controller boards, remote controller etc.

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

ERROR CODE

ERROR CODE

ERROR CODE

1 Turn on the power.
2 Press the [CHECK] button twice.
3 Set address with [TEMP] button if system control is used.
4 Press the [ON/OFF] button to stop the self-check.

A CHECK button
B Address
C TEMP. button
D IC : Indoor unit

OC: Outdoor unit
E Check code

F Unit No.
G Timer ON/OFF button

A

F

C

BBEED

G

<To delete check code>

1 Display the error code at the self-check result display screen.
2 The address for self-check will blink when the

G ON/OFF

button is pressed twice within three seconds.

– – – – : No trouble generated in the past.
F F F F : No corresponding unit.

TROUBLESHOOTING

8-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit.
Actions to be taken for service,which depends on whether or not the the inferior phenomenon is reoccurring at service, are
summarized in the table below. Check the contents below before investigating details.

8-2. 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.

■ Wired remote controller

16

If the unit cannot be operated properly after the above test run has been performed, refer to the following table to remove the cause.

• On wired remote controller

1Check code displayed in the LCD.

1 Check code

Symptom Remark

Wired remote controller

P1

Intake sensor error

P2 Pipe (TH2) sensor error
P4 Drain sensor error
P5
PA

Drain pump error

Forced compressor stop
P6 Freezing/ Overheating safeguard operation
P8 Pipe temperature error / Outdoor unit error
E4, E5 Remote controller signal receiving error

–
–

–
–

Fb Indoor unit control system error (memory error, etc.)
E0, E3

E1, E2 Remote controller control board error

Remote controller transmission error

•

Wired remote controller

PLEASE WAIT

Symptom

For about 2
minutes follow­ing power-on

• For about 2 minutes following power-on,op­eration of the remote controller is not possible
due to system start-up. (Correct operation)

Cause

•Connector for the outdoor unit’s protection

PLEASE WAIT → Error code

Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).

After about 2
minutes has
expired follow­ing power-on

device is not connected.

•Reverse or open phase wiring for the outdoor
unit’s power terminal block

•Incorrect wiring between indoor and outdoor
units

•Remote controller wire short

On the wireless remote controller with condition above, following phenomena takes place.

• No signals from the remote controller are accepted.

• Operation lamp is blinking.

• The buzzer makes a short piping sound.

Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2) provided on the indoor controller, refer to the following table.

LED1 (power for microcomputer) 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 main indoor unit.

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8-3. SELF-DIAGNOSIS ACTION TABLE

Error Code

P1

P2

Meaning of error code and detection method
Abnormality of room temperature

thermistor (TH1)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating operation.
Short: 90: or more
Open: -40: or less

Abnormality of pipe temperature
thermistor/Liquid (TH2)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating (except defrosting)
operation.
Short: 90: or more
Open: -40: or less

Note: Refer to the manual of outdoor unit for the details of display

such as F, U, and other E.

Cause

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 Defective thermistor

characteristics.

2 Contact failure of connector

(CN21) 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 90: or more or -40: or
less.

5 Defective indoor controller board.

Countermeasure

1–3 Check resistance value of thermistor.
0: ······15.0k"
10: ····9.6k"
20: ····6.3k"
30: ····4.3k"
40: ····3.0k"
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 8-7.
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.

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN21) on

the indoor controller board. Refer to 8-7. 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 exclusively 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 exclusive
difference with actual pipe <liquid> temperature,
replace indoor controller board.

P4

P5

Abnormality of drain sensor (DS)

1 Suspensive abnormality, if short/open of

thermistor is detected for 30 seconds
continuously.
Turn off compressor and indoor fan.

2 Short/open is detected for 30 seconds

continuously during suspensive
abnormality.
(The unit returns to normal operation,

if it has normally reset.)

3 Detect the following condition.

• During cooling and drying operation.

• In case that pipe <liquid> temperature

- room temperature <-10deg

(Except defrosting)

• When pipe <liquid> temperature or
room temperature is short/open
temperature.

• During drain pump operation.

Malfunction of drain pump (DP)

1 Suspensive abnormality, if thermistor

of drain sensor is let heat itself and
temperature rises slightly. Turn off
compressor and indoor fan.

2 Drain pump is abnormal if the condition

above is detected during suspensive
abnormality.

3 Constantly detected during drain pump

operation.

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN31) on the indoor controller
board. (Insert failure).

3 Breaking of wire or contact

failure of drain sensor wiring.

4 Defective indoor controller board.

1 Malfunction of drain pump
2 Defective drain

Clogged drain pump
Clogged drain pipe

3 Attached drop of water at the

drain sensor

• Drops of drain trickles from
lead wire.

• Clogged filter is causing
wave of drain.

4 Defective indoor controller board.

Turn the power off, and on again to operate
after check.

1–3 Check resistance value of thermistor.
0: ······6.0k"
10: ····3.9k"
20: ····2.6k"
30: ····1.8k"
40: ····1.3k"
2 Check contact failure of connector (CN31) on

the indoor controller board. Refer to 8-7. Turn
the power on again and check restart after
inserting connector again.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor
connector CN31-1 and 2 is short-circuited,
and abnormality reappears.

Turn the power off, and on again to operate
after check.

1 Check if drain-up machine works.
2 Check drain function.
3 Check the setting of lead wire of drain sensor

and check clogs of the filter.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor
connector CN31-1 and 2 is short-circuited
and abnormality reappears.
Refer to 8-7.

Turn the power off, and on again to operate
after check.

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