Mitsubishi Electric SUZ-KA09NAH2.MX User manual

SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. COMBINATION OF INDOOR AND OUTDOOR UNITS
...
2
2. PART NAMES AND FUNCTIONS...................... 2
3. SPECIFICATION................................................. 3
4. OUTLINES AND DIMENSIONS.......................... 4
5. WIRING DIAGRAM............................................ 5
6. REFRIGERANT SYSTEM DIAGRAM................ 9
7. DATA................................................................. 10
8. ACTUATOR CONTROL....................................12
9. SERVICE FUNCTION.......................................13
10. TROUBLESHOOTING......................................13
11. FUNCTION SETTING....................................... 29
12. DISASSEMBLY INSTRUCTIONS.....................32
HFC
utilized
R410A
R410A
Note:
This service manual describes
service data of the outdoor units
only.
PARTS CATALOG (OCB699)
No. OCH699
December 2018
Outdoor unit
[Model Name]
SUZ-KA09NA2
SUZ-KA09NAH2
SUZ-KA12NA2
SUZ-KA12NAH2
SUZ-KA15NA2
SUZ-KA15NAH2
[Service Ref.]
SUZ-KA09NA2.MX
SUZ-KA09NAH2.MX
SUZ-KA12NA2.MX
SUZ-KA12NAH2.MX
SUZ-KA15NA2.MX
SUZ-KA15NAH2.MX
SUZ-KA09NA(H)2.MX
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)

2
OCH699
1COMBINATION OF INDOOR AND OUTDOOR UNITS
PART NAMES AND FUNCTIONS
2
Heat pump type
Outdoor unit
SUZ-
—
—
Indoor unit
Service
Manual No.
Service Ref.
Heat pump without
electric heater
KA15
NA(H)2.MX
HWE08020
KA12
NA(H)2.MX
KA09
NA(H)2.MX
—
SLZ-KF09/12/15NA.TH
SEZ-KD09/12/15NA4R1.TH
PEAD-A09/12/15AA7.MX
SVZ-KP12NA.MX
MLZ-KP09/12NA-U1
OCH699
HWE1608A
OBH802
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
SUZ-KA09NA(H)2.MXSUZ-KA12NA(H)2.MXSUZ-KA15NA(H)2.MX

3
OCH699
Outdoor unit model SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 9 9 10
Fan motor F.L.A 0.50
Compressor
Model KNB073FRVMC SNB092FQAMT SNB130FQBMT
R.L.A 6.2 6.6 7.4
L.R.A 7.7 8.2 9.3
Refrigeration oil oz(L)/
(Model) 9.1(0.27)/(FV50S) 11.8(0.35)/(FV50S) 11.8(0.35)/(FV50S)
Refrigerant control Linear expansion valve
Sound level*1Cooling dB(A) 48 49 49
Heating dB(A) 50 51 51
Defrost method Reverse cycle
Dimensions W in 31-1/2 D in 11-1/4
H in 21-5/8
Weight Ib 81
([WHUQDO¿QLVK Munsell 3Y 7.8/1.1
Control voltage
(by built-in transformer) VDC 12 - 24
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness) Liquid in 1/4 (0.0315)
Gas in 3/8 (0.0315) 1/2 (0.0315)
Connection method Indoor Flared
Outdoor Flared
Between the indoor
& outdoor units Height difference ft 40
Piping length ft 65
Refrigerant charge (R410A) 2 lb 5 oz 2 lb 9 oz
Note: Test conditions are based on AHRI 210/240.
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3SPECIFICATION
OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Outdoor unit 208/230 V 1 phase
60 Hz
Min. 187 208 230 Max. 253

4
OCH699
4OUTLINES AND DIMENSIONS
clear *1
*1 4 in. (100 mm) or more when
front and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
holes
(KA09/12/15NA)
(KA09/12/15NAH)
REQUIRED SPACE
Liquid refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/4
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 3/8 (KA09/12)
Ø 1/2 (KA15)
4 in. (100 mm)
or more
14 in. (350 mm)
or more
8 in. (200 mm)
or more *2
4 in. (100 mm)
or more
Unit: inch(mm)
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX

5
OCH699
SUZ-KA09NA2.MX SUZ-KA12NA2.MX
5WIRING DIAGRAM

6
OCH699
SUZ-KA09NAH2.MX SUZ-KA12NAH2.MX

7
OCH699
SUZ-KA15NA2.MX

8
OCH699
SUZ-KA15NAH2.MX

9
OCH699
6REFRIGERANT SYSTEM DIAGRAM
Unit: Inch (mm)
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainer) Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
LEV
Ambient
temperature
thermistor
RT65
Muffler
Capillary tube
O.D. 0.118 ×
I.D. 0.079 × 9-7/16
(ø3.0 × ø2.0 × 240)
(KA09)
Outdoor heat
exchanger
temperature
thermistor
RT68
Capillary tube
O.D. 0.118 ×
I.D. 0.079 × 8-9/32
(ø3.0 × ø2.0 × 210)
Service
port
Service
port
Refrigerant pipe ø3/8 (ø9.52) (KA09/12)
(with heat insulator)
ø1/2 (ø12.7) (KA15)
Stop valve
(with service port)
Capillary tube
O.D. 0.157 ×
I.D. 0.094 × 9-7/16
(ø4.0 × ø2.4 × 240)
(KA12/15
)
Muffler
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
Max. Length
A
Max. Height
difference
B
Indoor
unit
Outdoor unit
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Model Refrigerant piping: ft Piping size O.D: in
Max. Length
A Max. Height difference BGas Liquid
SUZ-KA
09/12/15NA(H)2 65 40 3/8 (KA09/12)
1/2 (KA15) 1/4
ADDITIONAL REFRIGERANT CHARGE (R410A: oz)
Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation.
Model Outdoor unit
precharged Refrigerant piping length (one way): ft
25 30 40 50 60 65
SUZ-KA09NA(H)2 2 lb 5 oz 0 1.08 2.16 3.24 4.32 5.4SUZ-KA12NA(H)2 2 lb 9 oz
SUZ-KA15NA(H)2
Calculation: X oz = 1.08/5 oz / ft × (Refrigerant piping length (ft) - 25)

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OCH699
7DATA
STANDARD OPERATION DATA
Representative matching SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4
Item Unit Cooling Heating Cooling Heating Cooling Heating
Total
Capacity BTU/h 9000 12000 12000 15000 15000 18000
SHF - 0.82 — 0.82 — 0.86 —
Input kW 0.7 1.1 0.93 1.33 1.15 1.44
Electrical circuit
Indoor unit SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.06 0.04 0.07 0.05 0.09 0.07
Current A 0.5 0.39 0.57 0.46 0.74 0.63
Outdoor unit SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.64 1.06 0.86 1.28 1.06 1.37
Current A 2.89 4.64 3.47 5.29 4.24 5.63
Refrigerant circuit
Condensing pressure PSIG 358 473 387 441 415 386
Suction pressure
PSIG 133 110 147 99 141 99
Discharge temperature °F 160 169 167 168 166 167
Condensing temperature °F 109 114 114 124 119 114
Suction temperature °F 63 36 66 31 55 31
Ref. pipe length ft 25
Refrigerant charge (R410A) - 1.05 1.15 1.15
Indoor
unit
Intake air temperature DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
Discharge air temperature DB °F 59 104 57 105 57 101
Outdoor
unit
Intake air temperature DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43
Representative matching SLZ-KF09NA SLZ-KF12NA SLZ-KF15NA
Item Unit Cooling Heating Cooling Heating Cooling Heating
Total
Capacity BTU/h 9000 11000 12000 13000 14100 18000
SHF - 0.87 — 0.74 — 0.75 —
Input kW 0.67 0.81 0.9 1.31 1.15 1.73
Electrical circuit
Indoor unit SLZ-KF09NA SLZ-KF12NA SLZ-KF15NA
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.02 0.02 0.02 0.02 0.03 0.03
Current A 0.2 0.15 0.24 0.19 0.32 0.27
Outdoor unit SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.65 0.79 0.88 1.29 1.12 1.7
Current A 2.67 3.34 3.67 5.48 4.82 7.38
Refrigerant circuit
Condensing pressure PSIG 358 393 391 483 397 490
Suction pressure
PSIG 131 113 142 104 127 101
Discharge temperature °F 159 167 167 159 168 191
Condensing temperature °F 108 115 115 131 116 131
Suction temperature °F 56 40 62 33 54 32
Ref. pipe length ft 25
Refrigerant charge (R410A) - 1.05 1.15 1.15
Indoor
unit
Intake air temperature DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
Discharge air temperature DB °F 57 103 56 105 57 112
Outdoor
unit
Intake air temperature DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43

11
OCH699
Representative matching PEAD-A09AA7 PEAD-A12AA7 PEAD-A15AA7
Item Unit Cooling Heating Cooling Heating Cooling Heating
Total
Capacity BTU/h 9000 12000 12000 15000 15000 18000
SHF - 0.9 — 0.9 — 0.9 —
Input kW 0.72 0.9 0.93 1.16 1.15 1.35
Electrical circuit
Indoor unit PEAD-A09AA7 PEAD-A12AA7 PEAD-A15AA7
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.07 0.05 0.09 0.07 0.11 0.09
Current A 0.54 0.43 0.67 0.56 0.95 0.84
Outdoor unit SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.65 0.85 0.84 1.09 1.04 1.26
Current A 2.55 3.48 3.36 4.45 4.01 5.01
Refrigerant circuit
Condensing pressure PSIG 358 380 383 374 412 343
Suction pressure
PSIG 133 111 153 93 144 97
Discharge temperature °F 157 162 167 175 165 167
Condensing temperature °F 108 113 113 111 119 105
Suction temperature °F 57 38 49 40 57 38
Ref. pipe length ft 25
Refrigerant charge (R410A) - 1.05 1.15
Indoor
unit
Intake air temperature DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
Discharge air temperature DB °F 58 103 59 100 58 99
Outdoor
unit
Intake air temperature DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43
Representative matching SVZ-KP12NA MLZ-KP09NA MLZ-KP12NA
Item Unit Cooling Heating Cooling Heating Cooling Heating
Total
Capacity BTU/h 12000 11000 9000 12000 12000 15400
SHF - 0.89 — 0.82 — 0.74 —
Input kW 0.94 1.24 0.71 0.86 0.96 1.3
Electrical circuit
Indoor unit SVZ-KP12NA MLZ-KP09NA MLZ-KP12NA
Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60
Input kW 0.1 0.04
Current A 0.9 0.3
Outdoor unit SUZ-KA12NA(H)2 SUZ-KA09NA(H)2 SUZ-KA12NA(H)2
Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60
Input kW 0.84 1.11 0.67 0.82 0.92 1.26
Current A 3.18 4.33 2.77 3.4 3.92 5.32
Refrigerant circuit
Condensing pressure PSIG 384 374 355 344 372 437
Suction pressure
PSIG 153 96 130 108 137 98
Discharge temperature °F 167 170 158 162 165 172
Condensing temperature °F 113 111 108 105 96 109
Suction temperature °F 70 41 56 41 65 37
Ref. pipe length ft 25 25
Refrigerant charge (R410A) - 1.05 1.05 1.15
Indoor
unit
Intake air temperature DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
Discharge air temperature DB °F 59 100 57 104 57 111
Outdoor
unit
Intake air temperature DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43

12
OCH699
8-2. R.V. COIL CONTROL
Heating .................ON
Cooling .................OFF
Dry ....................OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
ON
OFF
ON
OFF
Outdoor fan
motor
Compressor
5 seconds 15 seconds
8-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
ON
OFF
Compressor
Outdoor fan
motor
R.V.coil ON
OFF
ON
OFF
<COOL>
5 seconds
<HEAT>
5 seconds
8ACTUATOR CONTROL
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor Purpose Actuator
Compressor LEV Outdoor fan
motor R.V.coil Indoor fan motor Defrost heater *
Discharge temperature
thermistor Protection żż
Indoor coil temperature
thermistor
Cooling: Coil frost prevention ż
Heating: High pressure protec-
tion żż
Defrost thermistor Heating: Defrosting żżżżż
Fin temperature thermistor Protection żż
Ambient temperature
thermistor
Cooling: Low ambient tempera-
ture operation żżż
Heating: Defrosting (Heater) ż
Outdoor heat exchanger tem-
perature thermistor
Cooling: Low ambient tempera-
ture operation żżż
Cooling: High pressure protec-
tion żżż
*. SUZ-KAƒNAH2 only.

13
OCH699
9-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board.
(Refer to "10-6. TEST POINT DIAGRAM AND VOLTAGE".)
Jumper Defrost ¿nish temperature
SUZ-KA09/12/15
JS
Soldered
(Initial setting) 41°F (5°C)
None
(Cut) 50°F (10°C)
9-2. PRE-HEAT CONTROL SETTING
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature.
The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature is 68°F
(20°C) or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W)
Pre-heat control setting
<JK>
ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board.
OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board.
(Refer to 10-6.1.)
Jumper Pre-heat control setting
JK Soldered Deactivated
(Factory setting)
Cut Activated
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
10 TROUBLESHOOTING
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and turn off the
breaker.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp is blinking ON and OFF to indicate an abnormality.
2) Before servicing check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) Refer to "10-2. TROUBLESHOOTING CHECK TABLE" and "10-3. HOW TO PROCEED "SELF-DIAGNOSIS"".
Lead wiring Housing point
9SERVICE FUNCTION

14
OCH699
NOTE: 1. The location of LED is illustrated at the right figure. Refer to "10-6.TESTPOINTDIAGRAM".
2. LED is lighted during normal operation.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the blinking frequency is “2”.
ON
OFF 2.5-second OFF 2.5-second OFF
0.5-second ON 0.5-second ON LED
Blinking ĺ
Inverter P.C. board
10-2. TROUBLE SHOOTING CHECK TABLE
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
No. Symptoms LED
indication check
code Abnormal point/ Condition Condition Remedy
1Outdoor
unit does not
operate.
1-time blink
every
2.5 seconds UP Outdoor power system Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started. ƒ5HFRQQHFWFRQQHFWRURIFRPSUHVVRU ƒ5HIHUWR³AHow to check inverter/
compressor”.
ƒ&KHFNVWRSYDOYH
2
U3 Outdoor thermistors Discharge temperature thermistor shorts, or opens during com-
pressor running. ƒ5HIHUWR³FCheck of outdoor thermistors”.
U4 Fin temperature thermistor, defrost thermistor, P.C. board
temperature thermistor, outdoor heat exchanger
temperature thermistor or ambient temperature thermistor
shorts, or opens during compressor running.
3FC Outdoor control system Nonvolatile memory data cannot be read properly. ƒ5HSODFHLQYHUWHU3&ERDUG
46-time blink
2.5 seconds
OFF
E8
E9
Serial signal The communication fails between the indoor and outdoor unit for
3 minutes. ƒ&KHFNLQGRRURXWGRRUFRQQHFWLQJZLUH ƒ5HSODFHLQGRRURURXWGRRU3&ERDUGLI
abnormality is displayed again.
511-time
blink
2.5 seconds
OFF
UE
Stop valve/Closed valve Closed valve is detected by compressor current. ƒ&KHFNVWRSYDOYH
616-time
blink
2.5 seconds
OFF
PL Outdoor refrigerant
system abnormality A closed valve and air trapped in the refrigerant circuit are
detected based on the temperature sensed by the indoor and
outdoor thermistors and the current of the compressor.
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ƒ&KHFNVWRSYDOYH
ƒ5HIHUWRO³&KHFNRIRXWGRRUUHIULJHUDQW
circuit”.
7'Outdoor unit
stops and
restarts
3 minutes
later' is
repeated.
2-time blink
2.5 seconds OFF Overcurrent protection /DUJHFXUUHQWÀRZVLQWRLQWHOOLJHQWSRZHUPRGXOH ƒ5HFRQQHFWFRQQHFWRURIFRPSUHVVRU
ƒ5HIHUWR³AHow to check inverter/
compressor”.
ƒ&KHFNVWRSYDOYH
83-time blink
2.5 seconds OFF Discharge temperature overheat protection Temperature of discharge temperature thermistor exceeds
116°C, compressor stops. Compressor can restart if discharge
temperature thermistor reads 100°C or less 3 minutes later.
ƒ&KHFNUHIULJHUDQWFLUFXLWDQGUHIULJHUDQWDPRXQW
ƒ5HIHUWR³kCheck of LEV”.
94-time blink
2.5 seconds OFF Fin temperature/P.C. board temperature therm-
istoroverheat protection
Temperature of fin temperature thermistor on the heat sink
exceeds 72 to 86°C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 72 to 85°C.
ƒ&KHFNDURXQGRXWGRRUXQLW
ƒ&KHFNRXWGRRUXQLWDLUSDVVDJH
ƒ5HIHUWR³ICheck of outdoor fan motor”.
10 5-time blink
2.5 seconds OFF High pressure protection Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode. ƒ&KHFNUHIULJHUDQWFLUFXLWDQGUHIULJHUDQWDPRXQW ƒ&KHFNVWRSYDOYH
11 8-time blink
2.5 seconds OFF Compressor synchronous abnormality The waveform of compressor current is distorted. ƒ5HFRQQHFWFRQQHFWRURIFRPSUHVVRU
ƒ5HIHUWR³AHow to check inverter/
compressor”.
12 10-time blink
2.5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up. ƒ5HIHUWR³ICheck of outdoor fan motor”. ƒ5HIHUWR³LCheck of inverter P.C. board”.
13 12-time blink
2.5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected normally. ƒ5HIHUWR³LCheck of inverter P.C. board”.
14 13-time blink
2.5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally. ƒ5HIHUWR³AHow to check inverter/
compressor”.
15 Outdoor unit
operates. 1-time blink 2.5 seconds OFF Frequency drop by current protection When the input current exceeds approximately
7A(KA09)/8A(KA12)/9A(KA15), compressor The unit is normal, but check the following. ƒ&KHFNLILQGRRU¿OWHUVDUHFORJJHG
ƒ&KHFNLIUHIULJHUDQWLVVKRUW
ƒ&KHFNLILQGRRURXWGRRUXQLWDLU
circulation is short cycled.
16 3-time blink
2.5 seconds OFF Frequency drop by high pressure protection Temperature of indoor coil thermistor exceeds 131 °F [55 °C] in
HEAT mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL mode Indoor coil thermistor reads 46 °F [8 °C] or less in COOL mode,
compressor frequency lowers.
17 4-time blink
2.5 seconds OFF Frequency drop by discharge temperature
protection
Temperature of discharge temperature thermistor exceeds 232
°F [111 °C], compressor frequency lowers. ƒ&KHFNUHIULJHUDQWFLUFXLWDQGUHIULJHUDQWDPRXQW ƒ5HIHUWR³kCheck of LEV”.
ƒ5HIHUWR³GCheck of outdoor thermistors”.
18 7-time blink
2.5 seconds OFF Low discharge tempera- ture protection Temperature of discharge temperature thermistor has been 122
°F [50 °C] or less for 20 minutes. ƒ5HIHUWR³kCheck of LEV”. ƒ&KHFNUHIULJHUDQWFLUFXLWDQGUHIULJHUDQWDPRXQW
19
8-time blink
2.5 seconds OFF PAM protection PAM: Pulse Amplitude
Modulation
The overcurrent flows into IGBT (Insulated Gate Biopolar
transistor:TR821) or the bus-bar voltage reaches 320 V or more,
PAM stops and restarts.
This is not malfunction. PAM protection
will be activated in the following cases:
1. Instantaneous power voltage
drop. (Short time power failure)
2. When the power supply voltage is high.
Zero cross detecting
circuit Zero cross signal for PAM control cannot be detected.
20 9-time blink
2.5 seconds OFF Inverter check mode The connector of compressor is disconnected, inverter check
mode starts. ƒ&KHFNLIWKHFRQQHFWRURIWKHFRPSUHVVRULV correctly connected.
ƒ5HIHUWR³AHow to check
inverter/compressor".

15
OCH699
10-3. HOW TO PROCEED "SELF-DIAGNOSIS"
As this air conditioner has a function to memorize all the failures that had occurred, the latest failure detail can be recalled by
following the procedure below. Use this function when the check code is not displayed with wired remote controller or the re-
mote controller at use is wireless type.
F1 F2 F3 F4
unemecivreS
rosruC :unemniaM
Test run
Input maintenance info.
Function setting
Check
Self check
kcehcfleS
:tceleS
Ref. address
sserddA
kcehcfleS
Ref. address
Return: teseR
Error Unt # CI.prG
Self check
Return: Reset
Ref. address
Error
-- Unt # Grp.
-- --
When there is no error history
Self check
Delete error history?
Ref. address
Cancel OK
Self check
Return:
Ref. address
Error history deleted
2
With the F1 or F2 button, enter the refrigerant address, and press the button.
Select "Self check" with the F1 or F2 button, and press the button.
1Select "Service" from the Main menu, and press the button.
3Check code, unit number, attribute will appear.
"-" will appear if no error history is available.
4Resetting the error history.
Press the F4 button (Reset) on the screen that shows the error history.
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Press the F4 button (OK) to delete the error history.
If deletion fails, "Request rejected" will appear.
"Unit not exist" will appear if no indoor units that are correspond to the entered
address are found.
Navigating through the screens
• To go back to the Service menu .......... button
• To return to the previous screen ....... button
10-3-1. Self-diagnosis <PAR-3xMAA ("x" represents 0 or later)>

16
OCH699
[Procedure]
1. Press the CHECK button twice.
• "CHECK" lights, and refrigerant address "00" blinks.
• Check that the remote controller's display has stopped before continuing.
2. Press the temperature buttons.
• 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.)
3. Point the remote controller at the sensor on the indoor unit and press the
HOUR button.
• If an air conditioner error occurs, the indoor unit's sensor emits an
intermittent buzzer sound, the operation light blinks, and the check code is
output.
(It takes 3 seconds at most for check code to appear.)
4. Point the remote controller at the sensor on the indoor unit and press the
ON/OFF button.
• The check mode is cancelled.
<Malfunction-diagnosis method at maintenance service>
10-3-2. Self-diagnosis <Wireless 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.
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

17
OCH699
OPERATION
INDICATOR
lamp blink
pattern
Beep Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 sec. On Approx. 3 sec. On 0.5 sec. On 0.5 sec. On 0.5 sec. On 0.5 sec. Off Approx. 2.5 sec. On Approx. 3 sec. On 0.5 sec. On 0.5 sec.
· · · 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
nth
1st 2nd 3rd 1st 2nd
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 sec. On 0.5 sec. On 0.5 sec. On 0.5 sec. On
0.5 sec. Off
Approx. 2.5 sec. On 0.5 sec. On 0.5 sec.
· · ·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
nth
1st 2nd 3rd 1st 2nd
Self-check
starts
(Start signal
received)
Beeper sounds
• Refer to the following tables for details on the check codes.
[Output pattern A]
[Output pattern A] Errors detected by indoor unit
Wireless remote controller
Wired remote controller
Symptom Remark
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1 P1 Intake sensor error
As for indoor
unit, refer to
indoor unit's
service manual.
2P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
3 E6,E7 Indoor/outdoor unit communication error
4 P4 Drain sensor error/Float switch connector (CN4F) open
5P5 Drain pump error
PA Forced compressor stop (due to water leakage abnormality)
6 P6 Freezing/Overheating protection operation
7 EE Communication error between indoor and outdoor units
9 E4,E5 Remote controller signal receiving error
12 Fb (FB)* Indoor unit control system error (memory error, etc.)
14 PL Abnormality of refrigerant circuit
- E0,E3 Remote controller transmission error
- E1,E2 Remote controller control board error
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wireless remote controller
Wired remote controller
Symptom
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times) Check code
1E9
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
2 UP Compressor overcurrent interruption
3 U3,U4 Open/short of outdoor unit thermistors
14 Others Other errors (Refer to the technical manual for the outdoor unit.)
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the OPERATION INDICATOR lamp does not come on, there are no error records.
,IWKHEHHSHUVRXQGVWLPHVFRQWLQXRXVO\³EHHSEHHSEHHSVHF´DIWHUWKHLQLWLDOEHHSVWR
FRQ¿UPWKHVHOIFKHFNVWDUWVLJQDOZDVUHFHLYHGWKHVSHFL¿HGUHIULJHUDQWDGGUHVVLVLQFRUUHFW
*The check code in the parenthesis indicates PAR-3xMAA model.("x" represents 0 or later).

18
OCH699
W
U
V
WH RD BK
W
U
V
WH RD BK
10-4. TROUBLE CRITERION OF MAIN PARTS
SUZ-KA09NA(H)2.MXSUZ-KA12NA(H)2.MXSUZ-KA15NA(H)2.MX
Part name Check method and criterion Figure
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature ther-
mistor (RT65)
Outdoor heat exchanger tem-
perature thermistor (RT68)
Measure the resistance with a tester.
5HIHUWR³,QYHUWHU3&ERDUG´LQ7(6732,17',$*5$0$1'
VOLTAGE”, for the chart of thermistor.
Discharge temperature ther-
mistor (RT62)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
5HIHUWR³,QYHUWHU3&ERDUG´LQ7(6732,17',$*5$0$1'
VOLTAGE”, for the chart of thermistor.
Compressor
Measure the resistance between terminals with a tester.
(Temperature: 14 - 104 °F (-10 - 40 °C))
1RUPDO
KA09 KA12 KA15
U-V
U-W
V-W 1.26 - 1.72 1.60 - 2.17 0.82 - 1.11
Outdoor fan motor
Measure the resistance between lead wires with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
Color of lead wire 1RUPDO
KA09/12/15
RD – BK
BK – WH
WH – RD 29 - 40
R. V. coil (21S4)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
1RUPDON
0.97 - 1.38
Expansion valve coil (LEV)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Color of lead wire 1RUPDO
RD – OG
37 - 54
RD – WH
RD – BU
RD – YE
RD
(+12V)
YE
BU
WH
OG
LEV
Defrost heater
(SUZ-KA·NAH2)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
1RUPDO
349 - 428

19
OCH699
10-5. TROUBLESHOOTING FLOW
Are the voltages balanced?
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
Replace the inverter P.C. board.
Check the voltage between terminals.
Check the compressor. See 10-5. ³&KHFNRIFRPSUHVVRU´
No
Yes
See 10-5. ³&KHFNRIRSHQSKDVH´
Ɣ:LWKWKHFRQQHFWRUEHWZHHQWKHFRPSUHVVRUDQGWKHLQWHOOLJHQWSRZHUPRGXOHGLVFRQQHFWHGDFWLYDWHWKHLQYHUWHUDQGFKHFNLI
the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
< Operation method (Test run operation)>
1. Press the TEST (RUN) button twice.
2. Press the MODE button and switch to the COOL (or HEAT) mode.
3. Compressor starts at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. To cancel test run operation, press the ON/OFF button on remote controller.
<Measurement point>
at 3 points
BK (U) - WH (V)
BK (U) - RD (W)
WH(V) - RD (W)
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board blinks 9 times.
(
Refer to "10-6. TEST POINT DIAGRAM AND VOLTAGE".)
Measure AC voltage between the lead wires at 3 points.
Refer to 10-5. ³&KHFNRIFRPSUHVVRU
operation time”.
Does the compressor operate continuously? Refer to 10-5. ³&KHFNRIFRPSUHVVRUVWDUWIDLOXUH´
OK.
No
Yes
Refer to 10-5. ³&KHFNRIFRPSUHVVRU
winding”.
Is the compressor normal? Replace the compressor.
No
Yes
B Check of open phase
A How to check inverter/compressor
C Check of compressor

20
OCH699
F Check of compressor start failure
D Check of compressor winding
E Check of compressor operation time
Ɣ'LVFRQQHFWWKHFRQQHFWRUEHWZHHQWKHFRPSUHVVRUDQGLQWHOOLJHQWSRZHUPRGXOHDQGPHDVXUHWKHUHVLVWDQFHEHWZHHQWKH
compressor terminals.
<Measurement point>
Measure the resistance between the lead wires at 3 points.
BK - WH
BK - RD
WH - RD
<Judgement>
Refer to "10-4. TROUBLE CRITERION OF MAIN PARTS".
>@················· Abnormal [short]
 ,QILQLWH>@········ Abnormal [open]
NOTE: Be sure to zero the ohmmeter before measurement.
After the compressor is heated with a drier,
does the compressor start?*1Replace the compressor.
Compressor start failure. Activate pre-heat control.
(Refer to "9-2. PRE-HEAT CONTROL SETTING")
No
Yes
Does the compressor run for 10 seconds or
more after it starts? Check the refrigerant circuit.
Check the stop valve.
Yes
No
&RQ¿UPWKDWaLVQRUPDO
• Electrical circuit check
1.Contact of the compressor connector
2.Output voltage of inverter P.C. board and balance of them (See 10-5. )
3.'LUHFWFXUUHQWYROWDJHEHWZHHQ'%DQGRQWKHLQYHUWHU3&ERDUG
4.Voltage between outdoor terminal block S1-S2
*1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Heating part
ƔConnect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.
<Operation method>
Start heating or cooling operation by pressing the TEST button
twice on the remote controller. (Test run mode)
(TEST RUN OPERATION: Refer to 10-5 B.)
<Measurement>
Measure the time from the start of compressor to the stop of
compressor due to overcurrent.
Compressor starts
Abnormal
(IPM failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
0 second
1 second
2 seconds
10 seconds
10 minutes
<Judgement>