Indoor Unit
SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)
Wired remote controller
Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
● Operation buttons
2
● Display
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 (The 12 hour clock or The 24
hour clock), 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
Low 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.
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 in the indoor unit, the remote controller will display the “Not Available”
● When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication
message.
If you are using the remote controller to operate multiple indoor units, this message will appear only if the feature is not
present at the parent unit.
(For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappears then start the operation.
3
2
SPECIFICATIONS
Model Name
Capacity
Power source
Power input
Current
Temperature set range Remote controller
Airflow direction
Fan
Type x Quantity
External static press
Motor type
Motor output
Driving mechanism
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)
External finish
External dimension
H x W x D
Net weight
Wiring
Refrigerant
piping diameter
Drain piping diameter
Sound level (Low-Mid-High)
(measured in anechoic room)
Insulation material
Air filter
Refrigerant control device
Protection devices
Heat exchanger
Varistor
Terminal block
Power outlet A
Standard
attachment
Remark
Note
Min.size of wire
Amperage of wire breaker
Liquid
Gas
Document
Accessory
1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Drain piping diameter
Sound level (Low-Mid-High)
(measured in anechoic room)
Insulation material
Air filter
Refrigerant control device
Protection devices
Heat exchanger
Varistor
Terminal block
Power outlet A
Standard
attachment
Min.size of wire
Amperage of wire breaker
Liquid
Gas
R410A
R410A
Document
Accessory
Remark
Note
1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD09NA(4)
External static pressure:
0.06[in.WG](15Pa)
High
Middle
30
SPL(dB)
26
Low
23
LINE
<60Hz>
NOTCH
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD09NA(4)
External static pressure:
0.02[in.WG](5Pa)
High
Middle
29
SPL(dB)
25
Low
22
LINE
<60Hz>
NOTCH
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD09NA(4)
External static pressure:
0.20[in.WG](50Pa)
High
Middle
33
SPL(dB)
29
Low
25
LINE
<60Hz>
NOTCH
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD09NA(4)
External static pressure:
0.14[in.WG](35Pa)
High
Middle
31
SPL(dB)
28
Low
24
LINE
<60Hz>
NOTCH
SOUND CRITERION CURVES
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
6
SEZ-KD12NA(4)
External static pressure:
0.02[in.WG](5Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
33
28
23
<60Hz>
LINE
SEZ-KD12NA(4)
External static pressure:
0.06[in.WG](15Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
33
28
23
<60Hz>
LINE
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
SEZ-KD12NA(4)
External static pressure:
0.14[in.WG](35Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
34
29
24
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
<60Hz>
LINE
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
SEZ-KD12NA(4)
External static pressure:
0.20[in.WG](50Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
35
31
25
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
<60Hz>
LINE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
7
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD15NA(4)
External static pressure:
0.06[in.WG](15Pa)
High
Middle
37
SPL(dB)
34
Low
30
LINE
<60Hz>
NOTCH
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD15NA(4)
External static pressure:
0.02[in.WG](5Pa)
High
Middle
36
SPL(dB)
33
Low
29
LINE
<60Hz>
NOTCH
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD15NA(4)
External static pressure:
0.20[in.WG](50Pa)
High
Middle
39
SPL(dB)
36
Low
32
LINE
<60Hz>
NOTCH
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
SEZ-KD15NA(4)
External static pressure:
0.14[in.WG](35Pa)
High
Middle
38
SPL(dB)
35
Low
31
LINE
<60Hz>
NOTCH
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
8
SEZ-KD18NA(4)
External static pressure:
0.02[in.WG](5Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
37
33
29
<60Hz>
LINE
SEZ-KD18NA(4)
External static pressure:
0.06[in.WG](15Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
38
34
30
<60Hz>
LINE
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
SEZ-KD18NA(4)
External static pressure:
0.14[in.WG](35Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
39
35
31
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
<60Hz>
LINE
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
SEZ-KD18NA(4)
External static pressure:
0.20[in.WG](50Pa)
90
NOTCH
High
Middle
Low
SPL(dB)
39
36
32
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
<60Hz>
LINE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
631252505001000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the
Function on the indoor units as shown in Table 1.
Ta ble.1 [Function table]
Select unit numbers 01 to 03 or all units (AL[wired remote controller] / 07[wireless remote controller])
*Refer to the Installation Manual for function settings.
ModeSettingMode no. Setting
Initial setting
Heater control
231
232-
Heater OFF
Inlet air temp. set temp.
Heater ON
Inlet air temp. < set temp.-4.5˚F(2.5˚C)
The fan will stop and the heater will turn off when
[DEFROST] or [ERROR] is displayed.
The fan will drive and the heater will turn on when
[DEFROST] or [ERROR] is displayed.
Set temp.
Set temp.-1.8
˚
F(1˚C)
Set tem p.-4 .5
˚
F(2.5˚C)
Inlet ai r temp.
Heater output
OFF
ON
Heater OFF
Inlet air temp. set temp.
Heater ON
Inlet air temp. < set temp.-1.8˚F(2.5˚C)
Set tem p.
Set temp.-1.8
˚
F(2.5˚C)
Inlet air tem p.
Heater output
OFF
ON
6-2. Fan control
*Refer to the Installation Manual for function settings.
By setting the Mode No. 23 in the Function Table in section 6-1 and using CN4Y on the optional parts PAC-YU25HT, the
following patterns of fan control will become possible when [DEFROST] or [ERROR] is displayed.
Fan control patterns when [DEFROST] or [ERROR] is displayed
*1 Fan speed setting
* If a heater is installed in the duct, do not use CN4Y. By doing so, the fan will turn off when the heater is on,
which may result in fire.
Heater is installed in the duct.No heater is installed in the duct.
Use of CN4Y (PAC-YU25HT)
Heater is off.
Heater is on.
Unused*
Fan ON*1
Fan ON*1
Fan OFF
Fan OFF
Used
Setting
Mode no.Setting
Mode
Fan control
Very low
Heating Thermo-OFF[DEFROST] or [ERROR]
STOP
Remote controller setting
Remote controller setting
Remote controller setting
Very low25
25
25
1
2
3
Initial setting
-
-
HEATER CONTROL
18
6-3. PAC-YU25HT (Optional Parts) installation
The following section describes installation of the External Heater Adapter that connects to SEZ-KD NA
series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner.
(1) Parts list
Check that the following parts are included in the package.
1) External output cable (with a yellow connector).............................2 in total
Tw o types of cables with different connectors are included.
2) Panel heater connector.................................................................. 3 in total
White: 1
Green: 2 (2 types)
(2) Connection to the indoor unit
Use the cables that fit the connectors on the indoor unit control board.
1) External output cable (with a yellow connector)
This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.
Connect the cable to CN24 on the indoor unit control board.
2) Panel heater connector (with a white connector)
This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit
control board specification, connect the cable to CN4Y as appropriate
<Image>
CN4Y for FAN control
(PAC-YU25HT)
(3) Locally procured wiring
A basic connection method is shown below.
Remote control boardRelay circuit
Electric Heater
power source
Electric Heater
or panel
heater
Preparations in the field
X
Indoor unit
Adapter
Red1
X
White 2
White 1
(applicable only when a panel
heater is connected)
Maximum cable length
is 10 m (32ft)
3
control board
CN24
YellowWhite
CN4Y
19
For relay X, use the specifications given below.
Rated voltage: 12VDC
Power consumption: 0.9W or less
* Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.
The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft.)
To extend this length, use sheathed 2-core cable.
Control cable type: CVV, CVS, CPEV or equivalent.
Cable size: 0.5 mm
2
~ 1.25 mm2 (16 to 22 AWG)
Don't extend the cable more than 10 meters (32ft)
(4) Wiring restrictions
Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft).
Longer than 10 meters (32ft) could cause improper operation.
Use a transit relay when extending wiring such as remote wiring.
Recommended circuit
Wiring diagram
1-phase
power supply
208V, 230V/60Hz
Control board
FS1, 2 ----- Thermal fuse
H1, H2 ----- Heater
26H --------- Overheat
protection thermostat
88H --------- Electromagnetic contactor
FS1
FS2
FS1
FS2
R
S
R
S
CN24
H2
88H
H1
88H
26H
88H
20
7
Lead wires
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACKDAY
MONITOR/SET
CLOCK
ON/OFF
B
C
A
E D F
ERROR CODE
1 Check codeSymptomRemark
P1Intake sensor error
P2Pipe (TH2) sensor error
P9Pipe (TH5) sensor error
E6,E7Indoor/outdoor unit communication error
P4Drain sensor error
P5Drain pump error
P6Freezing/Overheating protection operation
EECommunication error between indoor and outdoor units
P8Pipe temperature error
E0, E3~E5Remote controller transmission error
E1, E2Remote controller control board error
FbIndoor unit control system error (memory error, etc.)
E9Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UPCompressor overcurrent interruption
U3,U4Open/short of outdoor unit thermistors
UFCompressor overcurrent interruption (When compressor locked)
U2Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1,UdAbnormal high pressure (63H worked)/Overheating protection operation
U5Abnormal temperature of heat sink
U8Outdoor unit fan safeguard stop
U6Compressor overcurrent interruption/Abnormal of power module
U7Abnormality of super heat due to low discharge temperature
U9,UHAbnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit
/Current sensor error
OthersOther 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
service manual OC322.
• On wired remote controller.
1 Check code displayed in the LCD.
• For description of each check code, refer to the following table.
TROUBLESHOOTING
7-1. CAUTIONS ON TROUBLESHOOTING
(1) Before troubleshooting, check the followings:
1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing.
1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
7-2. SELF-CHECK FUNCTION
Wired remote controller
(1) Turn on the power.
(2) Press the [CHECK] button twice.
(3) Set refrigerant address with [TEMP] button
if system control is used.
(4) Press the [ON/OFF] button to stop the
self-check.
AA
CHECK button
BB
Indoor Unit’s Refrigerant address
CC
TEMP button
DD
IC : Indoor unit
OC : Outdoor unit
EE
Check code
FF
Indoor Unit No.
21
•
If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.
Symptom
Cause
Wired remote controllerLED 1, 2 (PCB in outdoor unit)
On the wireless remote controller with condition above, following phenomena take place.
• No signals from the remote controller are accepted.
• Operation lamp is blinking.
• The buzzer makes a short piping sound.
PLEASE WAIT
PLEASE WAIT → Error 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
After about 2
minutes has
expired 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 after power-on,operation 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, L3)
•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 microcomputer)Indicates whether control power is supplied. Make sure that this LED is
always lit.
LED2 (power for remote controller)
Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant address “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)
22
• Refer to the installation manual that comes with each remote controller for details.
• If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.
On the IR wireless remote controller with conditions above, following phenomena takes place.
• No signals from the remote controller are accepted.
• OPE lamp is blinking.
• The buzzer makes a short ping sound.
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
PLEASE WAIT
PLEASE WAIT →Error code
Display messages do not appear
even when operation switch is
turned ON (operation lamp does
not light up).
Symptom
After LED 1, 2 are lighted, LED 2 is turned
off, then only LED 1 is lighted. (Correct
operation)
Only LED 1 is lighted. → LED 1, 2 blink.
Only LED 1 is lighted. → LED 1, 2 blinks
twice, LED 2 blinks once.
• For about 2 minutes after power-on, operation 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, L3)
• Incorrect wiring between indoor and outdoor units
(incorrect polarity of S1, S2, S3)
• Remote controller wire short
For about 2 minutes
following power-on
After about 2 minutes has expired
following power-on
LED 1, 2 (PCB in outdoor unit)Wired remote controller
Cause
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/ insufficient refrigerant
Abnormal high pressure (63H worked)/ Overheating safeguard operation
Abnormal temperature of heat sink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal
synchronous signal to main circuit/Current sensor error
–
–
Other errors (Refer to the technical manual for the outdoor unit.)
For details, check the LED
display of the outdoor controller
board.
[Output pattern A] Errors detected by indoor unit
IR wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp flashes
(Number of times)
1
2
3
4
5
6
7
8
9
10
11
12
No sound
Wired remote controller
RF thermostat
Check code
P1
P2, P9
E6, E7
P4
P5
P6
EE
P8
E4
–
–
Fb
– –
IR wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp flashes
(Number of times)
1
2
3
4
5
6
7
8
9
10
11
12
Wired remote controller
RF thermostat
Check code
E9
UP
U3, U4
UF
U2
U1, Ud
U5
U8
U6
U7
U9, UH
–
13
14
–
Others
Symptom
Intake sensor error
Pipe (Liquid or 2-phase pipe) sensor error
Indoor/outdoor unit communication error
Drain sensor error
Drain pump error
Freezing/Overheating safeguard operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
No corresponding
Remark
*1 If the beeper does not sound again after the initial two 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 three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal was
received, the specified refrigerant address is incorrect.
• 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 on the LCD.
SymptomRemark
• RF thermostat is not established.
23
Indicates whether control power is supplied. Make sure that this LED is always lit.
Indicates whether power is supplied to the remote controller. This LED lights only in the case of
the indoor unit which is connected to the outdoor unit refrigerant address “0”.
Indicates state of communication between the indoor and outdoor units. Make sure that this LED is
always blinking.
LED 1 (power for microcomputer)
LED 2 (power for remote controller)
LED 3 (communication between indoor and outdoor units)
AUTO RESTART FUNCTION
Indoor controller board
This model is equipped with the AUTO RESTART FUNCTION.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor controller board.
The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically.
Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1).
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
24
7-3. SELF-DIAGNOSIS ACTION TABLE
Error Code
P1
P2
Abnormal point and detection method
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˚C[194˚F] or more
Open: -40˚C[-40˚F] or less
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˚C[194˚F] or more
Open: -40˚C[-40˚F] 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
(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 90˚C[194˚F] or more or
-40˚C[-40˚F] or less.
5 Defective indoor controller board
Countermeasure
1–3 Check resistance value of thermistor.
:[32˚F].......15.0k"
0
10:[50˚F].....9.6k"
20:[68˚F].....6.3k"
30:[86˚F].....4.3k"
40:[104˚F]...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 7-5.
Tu rn 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.
Tu rn 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 (CN44) on
the indoor controller board. Refer to 7-5. Turn
the power on again 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 extreme
difference with actual pipe <liquid> temperature,
replace indoor controller board.
P4
(5701)
P5
Contact failure of drain float switch (CN4F)
1 Extract when the connector of drain float
switch is disconnected.
(3 and 4 of connector CN4F is not
short-circuited.)
2 Constantly detected during operation.
Drain overflow 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.
Tu rn 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 Contact failure of connector
(Insert failure)
2 Defective indoor controller
board
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
Tu rn the power off, and on again to operate
after check.
1 Check contact failure of float switch connec-
tor.
Tu rn the power on again and check after
inserting connector again.
2 Operate with connector (CN4F) short-circuited.
Replace indoor controller board if abnormality reappears.
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 shor t-
circuited between
switch connector CN4F and abnormality
reappears.
It is not abnormal if there is no problem about
the above-mentioned
Tu rn the power off, and on again to operate
after check.
3-4 of the drain float
1~4
25
Error Code
P6
Abnormal point and detection method
Freezing/overheating protection is
working
1 Freezing protection (Cooling mode)
The unit is in six-minute resume prevention
mode if pipe <liquid or condenser/evaporator> temperature stays under
:[5˚F] for three minutes after the
-15
compressor started. Abnormal if it stays
under -15
within 16 minutes after six-minute
resume prevention mode.
2 Overheating protection (Heating mode)
The units is in six-minute resume
prevention mode if pipe <Liquid or condenser / evaporator> temperature is
detected as over 70
compressor started. Abnormal if the
temperature of over 70
detected again within 10 minutes after
six-minute resume prevention mode.
:[5˚F] for three minutes again
:[158˚F] after the
:[158˚F] is
Cause
(Cooling or drying mode)
1 Clogged filter (reduced airflow)
2 Shor t cycle of air path
3 Low-load (low temperature)
operation beyond 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 beyond the tolerance
range
4 Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is
defective.
Countermeasure
(Cooling or drying mode)
1 Check clogging of the filter.
2 Remove shields.
4 Refer to 7-7. DC Fan motor (FAN MOTOR/
INDOOR CONTROLLER BOARD)
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 7-7. DC Fan motor (FAN MOTOR/
INDOOR CONTROLLER BOARD)
P8
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 :
-3 deg˚C(-5.4deg˚F) ] (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 :
3 deg˚C(5.4deg˚F) [ (TH5-TH1)
5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit
(clogs)
8 Bypass circuit of outdoor unit
is defective.
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.
5 Check outdoor fan motor.
6~8Check operating condition of refrigerant
circuit.
1~4 Check pipe <liquid or condenser /
evaporator> 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.
Conduct temperature check with outdoor
controller circuit board after connecting
(
‘A-Control Service Tool(PAC-SK52ST)’.
23Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
)
26
Error Code
P9
Abnormal point and detection method
Abnormality of pipe temperature thermistor / Condenser-Evaporator (TH5)
1 The unit is in three-minute resume pro-
tection mode if short/open of thermistor
is detected. Abnormal if the unit does
not get back to normal within three minutes. (The unit returns to normal operation, if it has normally reset.)
2 Constantly detected during cooling, dry-
ing, and heating operation (except
defrosting)
Short: 90˚C[194˚F] or more
Open: -40˚C[-40˚F] or less
Cause
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
90:[194˚F] or more or
-40˚C[-40˚F] or less caused by
defective refrigerant circuit.
5 Defective indoor controller
board
Countermeasure
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 7-5.
Tu rn the power on and check restart after
inserting connector again.
4 Operate in test run mode and check pipe
<condenser / evaporator> temperature.
If pipe <condenser / evaporator> temperature is extremely low (in cooling mode) or
high (in heating mode), refrigerant circuit
may have defect.
find blank of transmission path for six
seconds and could not transmit.
(Error code: E3)
2 Remote controller receives transmitted
data at the same time, compares the
data, and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E3)
1 Abnormal if indoor controller board could
not find blank of transmission path.
(Error code: E5)
2 Indoor controller board receives trans-
mitted data at the same time, compares
the data,and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E5)
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 Mis-wiring of remote controller
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
of refrigerant address “0”
6 Noise has entered into the
transmission wire of remote
controller.
1 Tw o remote controller are set
as “main.”
(In case of 2 remote con-
trollers)
2 Remote controller is connected
with two 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 trans-
mission wire of remote controller.
1 Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2 Set one of the remote controllers “main” if
there is no problem with the action above.
3 Check wiring of remote controller.
•Total wiring length: max.500m
(Do not use cable ✕ 3 or more)
•The number of connecting indoor units:
max.16units
•The number of connecting remote controller: max.2units
When it is not the above-mentioned problem of
1~3
4
Diagnose remote controllers.
a) When “RC OK” is displayed,
Remote controllers have no problem.
Tu rn 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” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)
→Noise may be causing abnormality. ]
∗ If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.
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.
Tu rn the power off,and on again to check.
When becoming abnormal again, replace
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor controller board
cannot receive any signal normally for
six minutes after turning the power on.
2 Abnormal if indoor controller board
cannot receive any signal normally for
three minutes.
3 Consider the unit as abnormal under the
following condition: When two or more
indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for three minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.
Indoor controller board
Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.
Remote controller control board
1 Abnormal if data cannot be read normal-
ly from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
2 Abnormal if the clock function of remote
controller cannot be operated normally.
(Error code: E2)
Cause
1 Contact failure, short circuit or,
mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire
cuit board. (Connect A-control service tool,
PA C-SK52ST.)
Refer to Outdoor 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 Tu rn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board or outdoor
controller circuit board.
∗ Other indoor controller board may have
defect in case of twin triple indoor unit
system.
1-3 Tu rn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
1 Replace indoor controller board.
Countermeasure
PA
(2500)
Water leakage
This detection is performed during the
operation (stop, heating, fan, or error stop
mode etc.) other than cooling and dry.
1 When a) and b) are found, water leakage
occurs.
a) Pipe <liquid> temperature - inlet tem-
perature < -10˚C[14˚F] for 30 minutes
b) When drain float switch is detected to
be soaked in the water for 15 minutes
or more.
* When drain float switch is detected to
be NOT soaked in the water, each
counting of a) and b) is cleared.
*When this error is detected, the error
will not be reset until the main power is
reset.
1 Mis-piping of extension pipes
(When connected with multiple
units)
2 Mis-wiring of indoor/outdoor
unit connecting wire (When
connected with multiple units)
3 Detection failure of the indoor
unit inlet/ pipe <liquid> thermistor
4 Drain pump failure
5 Drainage failure
· Clogged drain pump
· Clogged drain pipe
6 Drain float switch failure
· Drain float switch is detected
to be soaked in the water (ON
status) due to the operation
failure of the moving parts.
· Contact failure of drain float
switch connector
(Loose connector)
1Check the extension pipes for mis-piping.
2Check the Indoor/outdoor unit connecting
wire for mis-wiring.
3Check room temperature display on remote
controller and indoor pipe <liquid> temperature. (Refer to the countermeasure on P2.)
4Check if drain-up machine works.
5 Check drain function.
6Check drain float switch. (Refer to the coun-
termeasure on P4 and P5.)
28
7-4. TROUBLESHOOTING BY INFERIOR PHENOMENA
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
Phenomena
(1)LED2 on indoor controller board
is off.
• When LED1 on indoor controller board is also off.
1 Power supply of rated voltage is not supplied to out-
door unit.
2 Defective outdoor controller circuit board
3 Power supply of 208~230V is not supplied to indoor
unit.
4 Defective indoor controller board
Cause
Countermeasure
1 Check the voltage of outdoor power
supply terminal block (L, N) or (L3, N).
• When AC 208~230V is not detected.
Check the power wiring to outdoor unit
and the breaker.
• When AC 208~230V is detected.
—Check 2 (below).
2 Check the voltage between outdoor
terminal block S1 and S2.
• When AC 208~230V is not detected.
Check the fuse on outdoor controller
circuit board.
Check the wiring connection.
• When AC 208~230V is detected.
—Check 3 (below).
3 Check the voltage between indoor terminal
block S1 and S2.
• When AC 208~230V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.
• When AC 208~230V is detected.
—Check 4 (below).
4 Check the fuse on indoor controller board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.
(2)LED2 on indoor controller board
is blinking.
• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting
wire
• When LED1 is lit.
1 Mis-wiring of remote controller wires
Under twin triple indoor unit system, 2 or more indoor
units are wired together.
2 Refrigerant address for outdoor unit is wrong or not
set.
Under grouping control system, there are some units
whose refrigerant address is 0.
3 Short-cut of remote controller wires
4 Defective remote controller
Check indoor/outdoor unit connecting wire
for connection failure.
1 Check the connection of remote con-
troller wires in case of twin triple indoor
unit system. When 2 or more indoor units
are wired in one refrigerant system,
connect remote controller wires to one of
those units.
2 Check the setting of refrigerant address
in case of grouping control system.
If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.
34 Remove remote controller wires and
check LED2 on indoor controller board.
• When LED2 is blinking, check the
short-cut of remote controller wires.
• When LED2 is lit, connect remote
controller wires again and:
if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.