Mitsubishi Electric CITY MULTI PURY-200M-B-BM. BSG How to use

Models PURY-200M-B-BM. BSG
PURY-250M-B-BM. BSG
Service Handbook
AIR CONDITIONERS CITY MULTI

CONTENTS
- 1 -
I Electrical Wiring Diagram
[1] Electrical Wiring Diagram ....................................................................................................... 2
II Refrigerant Circuit
[1] Refrigerant Circuit Figure........................................................................................................ 3
III Control
[1] Functions and Factory Settings of the Dipswitches ................................................................ 4
IV Test Run Mode
[1] Standard Operation Data (Reference Data) ........................................................................... 6
V Troubleshooting
[1] Check Code Lists.................................................................................................................... 8
[2] Preliminary Error Code Lists................................................................................................. 10
[3] Responding to Error Display on the Remote Controller........................................................ 11
VI LED Monitor Display on the Outdoor unit Board
[1] Table of LED Codes ............................................................................................................. 40

- 2 -
[ I Electrical Wiring Diagram ]
I Electrical Wiring Diagram
[1] Electrical Wiring Diagram
3
2
1
CH1 X01
CN20
(7P)
CN32
(3P)
CNS1
(2P)
CNS2
(3P)
TB3 TB7
10
AA
12
14 16
ShieldBB
Control board
(MAIN PKG)
+
-
~
~
~
DSA ZNR1~4
Centralized power supply
CN41
(4P)
CN40
(4P)
F1
6A
F2
6A
RSTE
R1
52C
FN1 FN3
FN2
Unit plate
Controller
box plate
E
Connecting to
the indoor unit,
remote controller
TB1
R
S
T
DS (Diode stack)
Power source
200V 3 phase
50/60Hz
1
2
3
4
5
6
7
1
2
3
4
4
5
6
7
V
V
U
U
W
W
MC
C
CNRS3
(7P)
CNRS2
(7P)
CN52C
(3P)
CNCT
(4P)
CNDC2
(3P)
CNDR2
(9P)
CN15V2
(14P)
CN15V1
(14P)
CNDR1
(9P)
CNDC1
(3P)
DCCT
Gate amp board
(G/A PKG)
IPM
INV board
Operation
Error
Charge
(INV PKG)
01 1
1
2
2
3
3
123
123
4123
POWER-BOARD
FN6
FN4
DCL
C1
+
P
N
F01
3A
LED1
LED2
CNVCC4
(2P)
CNVCC5
(2P)
1
2
1
2
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
1
2
12 12 12 1 2
3
3
4
5
1
2
3
4
5
3
2
1
3
2
1
SLEV
Abnormal output
Compressor ON/OFF output
Demand input
Night mode input
Snow sensor input
52
CNVCC3
(6P)
CNAC3
(5P)
CNLV1
(5P)
CN51
(5P)
CN3D
(3P)
CN3S
(3P)
CNVCC2
(6P)
CNAC2
(5P)
CNTH
(2P)
CNL2
(2P)
CN30V
(2P)
CNFAN
(3P)
MF
1
THHS L2 R2
12V
F01
2A
R
E
T
R
LED3
Note:SW3-10 is OFF For 200 models
ON For 250 models.
CN05
(4P)
CN03
(3P)
CN02
(8P)
CN01
(2P)
CNL
(3P)
TH4 TH3 TH6 TH5 TH7 TH1
63LS
Green
Green
Green
Blue
Blue
Blue
Blue
Blue
Yellow
Yellow
White
White
White
Red
Red Red
Red
Red
Red
Red
Red
Red
Red
Red
Red Red
Black White Red Black
E
T
63HS
CNH
(3P)
X03
SV
3
SV
6
SV
5
SV
4
X08
X07
X06
CN36
(9P)
2
3
4
5
6
7
8
9
Detection
circuit
6
5
4
3
2
1
43
5
2
7
1
321
43
32
42
86
1
121
6
5
4
3
2
1
3
2
1
3
2
1
CH2
CH3
63H
SSR
X05
X04
X02
CN33
(6P)
CN35
(3P)
CN34
(6P)
CN38
(3P)
SV
1
21
S4
SV
2
MF
5
4
3
2
1
546372814321
567894321
567894321
5678910111213144321
5678910111213144321
3213
3
2
2
1
1321
21321
CNFAN1
(5P)
Thermistor (Piping temp. detection)
Solenoid valve (Heat exchanger capacity control)
SV3~SV6
63HS
SLEV
THHS
63LS
Choke coil (Transmission)
Electronic expansion valve (Oil return)
Thermistor (Radiator plate)
DC Current Sensor (Direct Current)
Resistance of rush current prevention
Bleeder resistance
Main capacitor (smooth)
Electro-magnetic contactor (Inverter main circuit)
Motor for compressor
Motor Fan (Radiator plate)
Crank case heater (Compressor)
Four-way valve
Solenoid valve (Discharge-suction bypass)
High pressure switch
Thermistor (Discharge pipe temp. detection)
Thermistor (Liquid level detection of accumulator, lower)
Thermistor (Liquid level detection of accumulator, upper)
Thermistor (OA temp. detection)
Thermistor (Piping temp. detection)
Terminal block for power supply
Terminal block for transmission line (For centralized administration)
Terminal block for transmission line (For indoor series)
Earth terminal
Code heater (Liquid level detection of accumulator)
DCCT
52C
MF1
CH1
SV1,SV2
21S4
63H
TH1
TH3
TH4
TH5
TH6
TH7TB1
TB3
TB7
CH2,CH3
Symbol Symbol Symbol SymbolName Name Name Name
Motor Fan (Heat exchanger)
SV4SV3
High pressure sensor
L2
Low pressure sensor
R1
R2
C1
MC
ON
OFF
Factory default
Display of Relay
output 1 (Light ON)
Display of Check 1
(Blink)
Displayed contents when LD1 is lit (blink)
Operation of SW1
Contents
21S4 SV1 SV2 Always
Light ON
Error code display
Error address and the error code are displayed alternately
Example: Error address 51, Discharge temp. error (Error Code 1102)
LD1
<Display of LD1>
< Operation of SW1 (Self-diagnose switch) on Control Board and Displayed Contents on LD1>
EMF
Remarks
Flag 8 stays lit while power supply
of the microcomputer is turned on
1
56789104321
Flag 1 Flag 2 Flag 3 Flag 4 Flag 5 Flag 6 Flag 7 Flag 8
Flag 1 Flag 2 Flag 3 Flag 4 Flag 5 Flag 6 Flag 7 Flag 8
Compressor
in operation
Crank case
heater
5
4
3
2
1

- 3 -
[ II Refrigerant Circuit ]
II Refrigerant Circuit
[1] Refrigerant Circuit Figure
TH1
TH5
TH3
TH4
O/S
63HS
SP1
Comp
BV2
BV1
ST1
Solenoid valve block
SP2
Check valve block
CV1
ST6
SV1
CP1
SV2
ST5
CP2
CP3
ST3
ST4
SLEV
SA
MA
63H
TH6
HEXb
SV6
CV7
SV5
SV3
SV4
HEXf3
HEXf2
HEXf1
CV10
CV3
CV2
CV5
CV4
CV9CV8
CV6
63LS
Distributor
TH7
ACC

- 4 -
[ III Control ]
III Control
[1] Functions and Factory Settings of the Dipswitches
1. Outdoor unit
(1) Main board
Switch Function Function according to switch setting Switch setting timing
OFF ON ON OFF
SWU 1-2 Unit address setting Set to 00 or 51-100 with the dial switch
(Note 2) Before power on
SW1 For self diagnosis/
operation monitoring Refer to the LED monitor display on the outdoor unit board.
SW2
1Centralized control
switch
Without connec-
tion to the central-
ized controller
With connection to
the centralized
controller
Before power on
2Deletion of connec-
tion information Normal control Deletion Before power on
3Deletion of error his-
tory SW
Storage of IC/OC
error history
Deletion of IC/OC
error history Anytime after power on
4Refrigerant amount
adjustment Normal control Refrigerantamount adjustment mode
Disabled after 2
hours since the
compressor started.
Anytime after pow-
er on
5 - - - *Set the switch to OFF
6
OA sensor failure/
Liquid level over flow
abnormality enabled
Failure enabled Failure disabled Anytime after power on
7 Forced defrost Normal control Forced defrost
starts
10 minutes after
compressor startup
Anytime after
power on
8 Defrost timer setting 50 minutes 90 minutes Anytime after power on
(Except during defrost operation)
9- - - -
10 - - - *Set the switch to OFF
SW3
1SW 3-2 enabled/dis-
abled SW3-2 disabled SW3-2 enabled Anytime after power on
2Test run mode: ON/
OFF Stops all ICs Sends a test-run signal to all ICs
After power on and when SW3-1 is
on.
3
Defrost start temperature -6°C [21°F] -3°C [27°F] Anytime after power on
4
Defrost end temperature 8°C [46°F] 15°C [59°F] Anytime after power on (Except dur-
ing defrost operation)
5- - - -
6 Pump down operation Normal control Pump down opera-
tion
After power on and when the com-
pressor stops
7
Target condensing
temperature on the
heating mode Tcm
49°C [120°F] 53°C [127°F] Anytime after power on
8Harmonic action
device connection Not connected Connected Before power on
9 - - - *Set the switch to OFF
10 Unit model selection Model 200 Model 250 Before power on
SW4
1- - - -
2- - - -
3- - - -
4 - - - *Set the switch to OFF
Note 1: SWU 1-2 is set to 00 and SWU 3-10 is set in every model, and other SWUs are set to OFF at factory shipment.
Note 2: When the outdoor unit address is set to 100, set the address setting switch to any one of 01-50.

- 5 -
[ III Control ]
(2) INV board
Switch Function Function according to switch setting Switch setting timing
OFF ON ON OFF
SW1
1IDC sensor failure con-
dition switching
• 20A or over just
before starting
• 10A or less after
5 seconds from
starting
• 20A or over just be-
fore starting
(10A or less after 5
seconds from start-
ing is disabled)
Anytime after power on
2- - - - -
3- - - - -
4 Serial communication Communicated
No communication Anytime after power on
Note 1: At factory default, all switches are set to OFF.

- 6 -
[ IV Test Run Mode ]
IV Test Run Mode
[1] Standard Operation Data (Reference Data)
1. PURY
(1) Cooling operation
Operation
Outdoor unit model
PURY-200
CMB-104
PURY-250
CMB-104
Operating conditions
Power supply V/Hz 200/60 200/60
Ambient
tempera-
ture
Indoor DB/WB
°C
27.0/19.0 27.0/19.0
Outdoor 35.0/24.0 35.0/24.0
Indoor
unit
No. of connected
units Unit 4 4
No. of operating
units -4 4
Model - 80 71 56 22 112 80 71 22
Piping
Main pipe
m
55
Branchpipe 55555555
Total pipe length 25 25
Fan speed - Hi Hi Hi Hi Hi Hi Hi Hi
Amount of refrigerant kg 15.4 17.2
Outdoor unit
Electric current A 27.7 34.7
Voltage V 200 200
LEV opening
Indoor unit
Pulse
330 460 430 300 410 330 460 300
BC controller (1/3) 2000 - 160 - 2000 - 165 -
Oil return section 180 180
Pressure
High pressure/Low presuure
MPa
20.7/5.0 19.4/4.0
BC controller liquid/intermediate 19.6/19.6 18.3/18.3
Temp. of
each
section
Outdoor
unit
Discharge (TH1)
°C
[°F]
107 [225] 110 [230]
Hear exchanger outlet (TH5) 50 [122] 47 [117]
Accumulator inlet 7 [45] 7 [45]
Accumulator outlet 10 [50] 10 [50]
Inlet 12 [54] 12 [54]
Liquid level detection, upper
(TH4) 40 [104] 40 [104]
Liquid level detection, lower
(TH3) 35 [95] 35 [95]
Compressor shell bottom 75 [167] 70 [158]
Indoor
unit
LEV inlet 26 [79] 30 [86]
Hear exchanger outlet 15 [59] 15 [59]

- 7 -
[ IV Test Run Mode ]
(2) Heating operation
Operation
Outdoor unit model
PURY-200
CMB-104
PURY-250
CMB-104
Operating conditions
Power supply V/Hz 200/60 200/60
Ambient
tempera-
ture
Indoor DB/WB
°C
20.0/- 20.0/-
Outdoor 7.0/6.0 7.0/6.0
Indoor
unit
No. of operating
units Unit
44
44
Model - 80 71 56 22 112 80 71 22
Piping
Main pipe
m
55
Branchpipe 55555555
Total pipe length 25 25
Fan speed - Hi Hi Hi Hi Hi Hi Hi Hi
Amount of refrigerant kg 15.4 15.4
Outdoor unit
Electric current A 27.0 33.5
Voltage V 200 200
LEV opening
Indoor unit
Pulse
600 950 750 400 750 600 950 400
BC controller (1/3) - - 535 - - - 715 -
Oil return section 115 180
Pressure
High pressure/Low presuure
MPa
18.5/3.6 18.0/3.7
BC controller liquid/intermediate 17.5/14.0 17.0/14.0
Temp. of
each
section
Outdoor
unit
Discharge (TH1)
°C
[°F]
80 [176] 85 [185]
Hear exchanger outlet (TH5) -2 [28] -1 [30]
Accumulator inlet -1 [30] -1 [30]
Accumulator outlet -4 [25] -2 [28]
Inlet -1 [30] -1 [30]
Liquid level detection, upper
(TH4) 18 [64] 22 [72]
Liquid level detection, lower
(TH3) -1 [30] -1 [30]
Compressor shell bottom 45 [113] 40 [104]
Indoor
unit
LEV inlet 80 [176] 85 [185]
Hear exchanger outlet 38 [100] 40 [104]

- 8 -
[ V Troubleshooting ]
V Troubleshooting
[1] Check Code Lists
Error Code Error code definition
Searched unit
Notes
0403 Serial communication error
0900 Test run mode O
1102 Abnormal discharge air temperature O
1112 Abnormal low pressure
saturation temperature
Liquid level detection temp.
sensor (TH4) O
1113 Liquid level detection temp.
sensor (TH3) O
1301 Abnormal low pressure O
1302 Abnormal high pressure (Outdoor unit) O
1368 Abnormal high pres-
sure (BC controller)
Liquid
1370 Intermediate
1500 Excessive or insufficient refrigerant O
1501 Refrigerant shortage error O
2500 Water leakage O
2502 Drain pump failure O
2503 Drain sensor (DS) failure O
4102 Open-phase O
4103 Reverse phase/open phase O
4115 Power supply sync signal abnormality O
4116 RPM error/Motor malfunction O
4121 Harmonics action device error O
4200 INV failure Bus voltage drop O
Bus voltage detection circuit
failure O
AC input drop O
Current detection circuit failure O
OCT detection circuit failure O
Cooling fan failure O
4210 Over-current cut-off
In operation O
Within 30 seconds after the
compressor started O
4220 INV bus voltage drop O
4230 Heatsink overheat protection O
Temperature rise in the control box protection O
4240 Overload protection O
4250 IPM/Bus voltage abnormality O
4260 Cooling fan abnormality O
5101
Temperature sensor
failure
Suction air temperature
(TH21) O
Return of OA processing unit
(TH4) O
Outlet of Outdoor unit (TH1) O
5102
Suction air temperature
(TH22) O
Pipes on the OA processing
unit (TH2) O
Outdoor unit
Indoor unit
BC controller
OA processing unit
Remote controller

- 9 -
[ V Troubleshooting ]
5103
Temperature sensor
failure
Indoor gas side pipe (TH23) O
Pipes on the OA processing
unit (gas side) (TH3) O
Outdoor liquid level detection
(TH3) O
5104 OA processing unit (TH1) O
Liquid level detection (TH4) O
5105 Piping (TH5) O
5106 OA temperature (TH6) O
5107 Piping (TH7) O
5110 Radiator plate (THHS) O
5111
Temperature sensor
(BC controller)
Liquid inlet of BC controller
(TH11) O
5112 Bypass outlet (TH12) O
5113
Heat exchanger outlet of liquid
level detection (TH13: Type
B1 only)
O
5114
Heat exchanger inlet of liquid
level detection (TH14: Type
B1 only)
O
5115 Bypass inlet (TH15) O
5116 Intermediate (TH16) O
5201 Low pressure sensor failure (Outdoor unit) O
5301 IDC sensor/circuit failure O
6600 Address overlaps O O O O
6602 Transmission processor hardware error O O O O
6603 Transmission circuit bus-busy O O O O
6606 Communication error with the transmission processor O O O O
6607 No ACK O O O
6608 No response O O O
6810 UR communication error (UR: unit remote controller) O O O
7100 Total capacity error O
7101 Capacity code error O
7102 Error in the number of connected units O
7105 Address setting error O
7106 Attribute setting error O
7107 Branch port setting error O
7111 Remote controller sensor failure O O
7130 Incompatible units O
Error Code Error code definition
Searched unit
Notes
Outdoor unit
Indoor unit
BC controller
OA processing unit
Remote controller

- 10 -
[ V Troubleshooting ]
[2] Preliminary Error Code Lists
Preliminary error code Contents of preliminary error
1202 Abnormal discharge air temp. or discharge air temp. sensor preliminary failure (TH1)
1205 Piping temp. sensor preliminary failure (TH5)
1212 Low pressure saturation temp. or low pressure saturation temp. sensor preliminary failure (TH4)
1213 Low pressure saturation temp. or low pressure saturation temp. sensor preliminary failure (TH3)
1214 THH sensor/circuit preliminary failure
1216 Liquid outlet temperature sensor at Sub-Cooled coil preliminary failure (TH7)
1221 OA temperature sensor preliminary failure (TH6)
1402 Preliminary high pressure abnormality or pressure sensor preliminary failure
1600 Overfilling refrigerant preliminary error
1605 Preliminary vacuum operation protection
4171 Harmonics action device preliminary error
4300
Idc sensor/circuit preliminary failure
Vdc sensor/circuit preliminary failure
Serial communication preliminary error
4310 Over current cut-off preliminary error
4320 Preliminary bus voltage drop abnormality
4330 Preliminary heat sink overheat malfunction
4340 Overload protection
4350 Preliminary IPM/Bus voltage abnormality
4360 Cooling fan preliminary failure

- 11 -
[ V Troubleshooting ]
[3] Responding to Error Display on the Remote Controller
1. Mechanical system
Error Code Error definition and error
detection method Cause Check method and remedy
0403 Serial commu-
nication error
Serial communication er-
ror between the main
board and the INV board.
(1) Faulty wiring Check for wiring between the con-
nector (CNRS3) on the main board
and the connector (CNRS2) on the
INV board. Check for contact of the
connectors.
(2) Inverter board switch set-
ting error
Confirm that the SW1-4 on the INV
board is set to OFF.
(3) INV board failure Replace the compressor INV board
when the power turns on automati-
cally, even if the power source is re-
set.
1102 Abnormal dis-
charge air tem-
perature
1.If the discharge tem-
perature 140°C
[284°F] or more is de-
tected (the first detec-
tion), the outdoor unit
stops once, turns to
anti-restart mode for 3
minutes, and restarts
after 3 minutes auto-
matically.
2.If the discharge tem-
perature of 140°C
[284°F] or more is de-
tected (the second de-
tection) within 30
minutes after the stop
of the outdoor unit de-
scribed above the out-
door unit will make an
error stop, and the er-
ror code, "1102" will
be displayed.
3.If the discharge tem-
perature of 140°C
[284°F] or more is de-
tected more than 30
minutes after the pre-
vious stop of the out-
door unit, the
detection is regarded
as the first detection,
and the operation de-
scribed in step 1
above will start.
4.For 30 minutes after
the stop of the outdoor
unit, preliminary errors
will be displayed on
the LED display.
(1) Gas leak, gas shortage Check the refrigerant amount.
(2) Overload operation Check operating conditions and op-
eration status of indoor/outdoor
units.
(3) LEV failure on the indoor
unit
(4) LEV failure on the BC con-
troller
Cooling only LEV3
Cooling main LEV1, (2), 3
Heatingonly, Heatingmain
LEV3, (4)
Defrost LEV3
(5) SVM failure on the BC con-
troller →Cooling only, De-
frost
(6) SVA failure on the BC con-
troller →Cooling only,
Cooling main
(7) SVB failure on the BC con-
troller →Heating only,
Heating main
(8) Solenoid valve SV (3-6)
failurer →Heating only,
Heating main
Perform a cooling or heating opera-
tion and check the operation.
Cooling : LEV on the indoor unit
LEV1, (2), 3
SVM
SVA
Heating : LEV on the indoor unit
LEV3, (4)
SVB
SV3-6
Check the LEV.
(9) Branch port address set-
ting error
Check the branch port address set-
ting on the indoor unit
(10) Closed ball valve Confirm that the ball valve is fully
open.
(11) Fan block of the outdoor
unit, the motor and the fan
condenser failure →Heat-
ing only, Heating main
(Rise in discharge temp.
by low pressure drawing
for (3) - (11).)
Check the outdoor fan.
(12) Gas leak between low
and high pressures
(4-way valve failure, Com-
pressor failure, Solenoid
valve (SV1) failure)
Perform a cooling or heating opera-
tion and check the operation.
(13) Solenoid valve (SV2) fail-
ure (The by-pass valve
(SV2) can not control rise
in high pressure.)
Check the solenoid valve
(14) Thermistor failure (TH1) Check the thermistor resistor.
(15) Input circuit failure on the
controller board thermistor
Check the inlet air temperature on
the LED monitor and check the con-
tact of the connector.

- 12 -
[ V Troubleshooting ]
1112 (Low pres-
sure satura-
tion tempera
ture)
Liquid level de-
tection temp.
sensor
(TH4)
1.If the saturation temp.
sensor TH3/4 or temp.
sensor for liquid level
detection TH3/TH4
detects -40°C [-40°F]
or lower during the
above operation (the
first detection), the
outdoor unit stops
once, turns to anti-re-
start mode for 3 min-
utes, and restarts after
3 minutes automatical-
ly.
2.If the discharge tem-
perature of -40°C
[-40°F] or lower is de-
tected (the second de-
tection) within 30
minutes after the stop
of the outdoor unit de-
scribed above the out-
door unit will make an
error stop, and the er-
ror code, "1112" or
"1113" will be dis-
played.
3.If the discharge tem-
perature of -40°C
[-40°F] or lower is de-
tected more than 30
minutes after the pre-
vious stop of the out-
door unit, the
detection is regarded
as the first detection,
and the operation de-
scribed in step 1
above will start.
4.For 30 minutes after
the stop (the first stop
or the second stop) of
the outdoor unit, pre-
liminary errors will be
displayed on the LED
display.
Note 1: The Saturation temp.
failure is not detected
for 3 minutes after
the compressor
starts, during the de-
frost operation and
for 3 minutes after
the defrost operation
stops.
Note 2: When short/open is
detected by the sen-
sor TH3-TH4 in ten
minutes before and
after the compressor
runs, "1112" or
"1113" will be dis-
played.
(1) Gas leak, gas shortage Check the refrigerant amount.
(2) Light-load operation Check operating conditions and op-
eration status of indoor/outdoor
units.
(3) LEV failure on the indoor
unit
(4) LEV failure on the BC con-
troller
Cooling only LEV3
Cooling main LEV1, (2), 3
Heatingonly, Heating main
LEV3, (4)
Defrost LEV3
(5) SVM failure on the BC con-
troller →Cooling only, De-
frost
(6) SVA failure on the BC con-
troller →Cooling only,
Cooling main
(7) SVB failure on the BC con-
troller →Heating only,
Heating main
(8) Solenoid valve SV (3-6)
failurer →Heating only,
Heating main
Check the refrigerant amount.
Perform a cooling or heating opera-
tion and check the operation.
Cooling : LEV on the indoor unit
LEV1, (2), 3
SVM
SVA
Heating : LEV on the indoor unit
LEV3, (4)
SVB
SV3-6
Check the LEV and the solenoid
valve
(9) Branch port address set-
ting error
Check the branch port address set-
ting on the indoor unit
(10) Ball valve failure Confirm that the ball valve is fully
open.
(11) Short cycle on the indoor
unit side
Check the indoor units for problems
and correct them, if any.
(12) Clogged filter on the in-
door unit
1113 (Low pres-
sure satura-
tion tempera
ture)
Liquid level de-
tection temp.
sensor
(TH3)
(13) Reduced air flow due to
dirty fan on the indoor unit
(14) Dirty heat exchanger of
the indoor unit
(15) Fan block of the indoor
unit and the motor failure
(Lowered in low pressure
caused by lowered evapo-
ration capacity in cooling
operation for (10) - (15).)
(16) Short cycle on the out-
door unit side
Check the outdoor units for problems
and correct them, if any.
(17) Dirty heat exchanger of
the outdoor unit
(18) Fan block of the outdoor
unit, the motor and the fan
condenser failure
(Lowered in low pressure
caused by lowered capaci-
ty in heating operation for
(3) - (11).)
Check the outdoor fan.
(19) Solenoid calve SV1, 2
failure
The by-pass valve (SV2)
can not control drop in low
pressure.
Check the solenoid valve
(20) Thermistor failure (TH3-
TH7)
Check the resistance value of the
thermistor
(21) Pressure sensor failure Check the pressure sensor
(22) Thermistor on the control
board/input circuit of the
pressure sensor failure
Check the inlet temperature of the
sensor/pressure on the LED monitor
and the contact of the connector.
(23) Thermistor settings error
(TH3-7)
Error Code Error definition and error
detection method Cause Check method and remedy

- 13 -
[ V Troubleshooting ]
1301 Abnormal low
pressure
When starting the com-
pressor from Stop Mode
for the first time if low-
pressure reads
0.098MPa [14psi] imme-
diately before start-up,
the operation immediate-
ly stops.
(1) Inner pressure drop due to
a leakage.
(2) Low pressure sensor fail-
ure
(3) Torn outer rubber
(4) A pin on the male connec-
tor is missing or contact
failure
(5) Disconnected wire
(6) Failure of the low pressure
input circuit on the control-
ler board
Check the low pressure sensor.
Error Code Error definition and error
detection method Cause Check method and remedy

- 14 -
[ V Troubleshooting ]
1302 Abnormal high
pressure 1
(Outdoor unit)
1.If the pressure of
2.74MPa [397psi] or
higher is detected by
the pressure sensor
during operation (the
first detection), the
outdoor unit stops
once, turns to anti-re-
start mode for 3 min-
utes, and restarts after
3 minutes automatical-
ly.
2.If the pressure of
2.94MPa [426 psi] or
higher is detected by
the pressure sensor
(the second detection)
within 30 minutes of
the second stop of the
outdoor unit, the out-
door unit will make an
error stop, and the er-
ror code "1302" will be
displayed.
3.If the pressure of
2.74MPa [397 psi] or
higher is detected
more than 30 minutes
after the stop of the
outdoor unit, the de-
tection is regarded as
the first detection, and
the operation de-
scribed in step 1
above will start.
4.For 30 minutes after
the stop of the outdoor
unit, preliminary errors
will be displayed on
the LED display.
5.The outdoor unit
makes an error stop
immediately when not
only the pressure sen-
sor but also the pres-
sure switch detects
2.94+0,-0.15 MPa
[426+0,-21.8 psi]
(1) LEV failure on the indoor
unit
(2) LEV failure on the BC con-
troller →Heating only,
Heating main LEV on the
indoor unit 3, (4)
Defrost LEV3
(3) SVM failure on the BC con-
troller
Cooling only, Defrost
(4) SVA failure on the BC con-
troller
Cooling only, Cooling main
(5) SVB failure on the BC con-
troller
Heating only, Heating main
Perform a heating operation and
check the operation.
Cooling : LEV on the indoor unit
LEV1, (2), 3
SVM
SVA
Heating : LEV on the indoor unit
LEV3, (4)
SVB
SV3-6
(6) Solenoid valve SV (3-6)
failurer
Heating only, Heating main
Check the LEV and the solenoid
valve.
(7) Branch port address set-
ting error Check the branch port address set-
ting on the indoor unit
(8) Closed ball valve Confirm that the ball valve is fully
open.
(9) Short cycle on the indoor
unit side
(10) Clogged filter on the in-
door unit
(11) Reduced air flow due to
dirty fan on the indoor unit
fan
(12) Dirty heat exchanger of
the indoor unit
(13) Fan block of the indoor
unit and the motor failure
(Rise in high pressure
caused by lowered con-
densing capacity in heat-
ing operation for (9) - (13).)
Check the indoor units for problems
and correct them, if any.
(14) Short-cycle on the indoor
unit
(15) Contamination or plug-
ging of the outdoor heat
exchanger
Check the indoor units for problems
and correct them, if any.
(16) Fan block of the outdoor
unit, the motor and the fan
condenser failure →
Heating only, Heating main
(Rise in high pressure
caused by cooled and low-
ered condensing capacity
in heating operation for
(14)-(16).)
Check the outdoor fan.
(17) Solenoid valve (SV1,
SV2) malfunction (The by-
pass valve (SV1,2) can not
control rise in high pres-
sure).
Check the solenoid valve.
(18) Thermistor failure (TH3-7) Check the thermistor resistance value
(19) Pressure sensor failure Check the high pressure sensor.
(20) Thermistor and the pres-
sure sensor input circuit on
the main board failure
Check the temperature and the pres-
sure of the sensor with LED monitor
and check the contact failure of the
connector.
(21) Thermistor settings
failure (TH3-TH7)
(22) Disconnected male con-
nector on the pressure
switch (63H) or discon-
nected wire
Abnormal high
pressure 2
(Outdoor unit)
If the pressure of
0.098MPa [14psi] or low-
er is registered on the
pressure sensor immedi-
ately before start-up, it
will trigger an abnormal
stop, and error code
"1302" will be displayed.
(1) Inner pressure drop due to
a leakage.
(2) Pressure sensor failure
(3) Torn outer rubber
(4) A pin on the male connec-
tor on the pressure sensor
is missing or contact failure
(5) Disconnected pressure
sensor cable
(6) Failure of the pressure
sensor input circuit on the
controller board
Check the high pressure sensor.
Error Code Error definition and error
detection method Cause Check method and remedy

- 15 -
[ V Troubleshooting ]
1368 (Abnormal
high pressure
[BC control-
ler])
Liquid side
If the pressure sensor
(liquid side) or the inter-
mediate pressure sensor
detects 2.94Mpa, the unit
will make an error stop,
and the error code (1368"
or "1370" will be dis-
played.
(1) LEV failure on the indoor
unit
(2) LEV failure on the BC con-
troller
Heatingonly, Heatingmain
LEV3, (4)
Defrost LEV3
(3) SVM failure on the BC con-
troller →Cooling only, De-
frost
(4) SVA failure on the BC con-
troller →Cooling only,
Cooling main
(5) SVB failure on the BC con-
troller →Heating only,
Heating main
(6) Solenoid valve SV (3-6)
failurer →Heating only,
Heating main
Perform a cooling or heating opera-
tion and check the operation.
Cooling : LEV on the indoor unit
LEV1, (2), 3
SVM
SVA
Heating : LEV on the indoor unit
LEV3, (4)
SVB
SV3-6
Check the LEV and the solenoid
valve
(7) Branch port address set-
ting error
Check the branch port address set-
ting on the indoor unit
(8) Ball valve failure Confirm that the ball valve is fully
open.
(9) Short cycle on the indoor
unit side
Check the indoor units for problems
and correct them, if any.
(10) Clogged filter on the in-
door unit
(11) Reduced air flow due to
dirty fan on the indoor unit
1370 (Abnormal
high pressure
[BC control-
ler])
Intermediate
(12) Dirty heat exchanger of
the indoor unit
(13) Fan block of the indoor
unit and the motor failure
(Lowered in low pressure
caused by lowered evapo-
ration capacity in cooling
operation for (9) - (13).)
(14) Short cycle on the out-
door unit side
Check the outdoor units for problems
and correct them, if any.
(15) Dirty heat exchanger of
the outdoor unit
(16) Fan block of the outdoor
unit, the motor and the fan
condenser failure →
Heating only, Heating main
(Lowered in low pressure
caused by lowered capaci-
ty in heating operation for
(14) - (16).)
Check the outdoor fan.
(17) Solenoid valve SV1, 2
failure
The by-pass valve (SV1, 2)
can not control drop in low
pressure.
Check the solenoid valve
(18) Thermistor failure (TH3-
TH7)
Check the resistance value of the
thermistor
(19) Pressure sensor failure Check the pressure sensor
(20) Thermistor on the control
board/input circuit of the
pressure sensor failure
(21) Thermistor settings error
(TH3-7)
Check the inlet temperature of the
sensor/pressure on the LED monitor
and the contact of the connector.
Error Code Error definition and error
detection method Cause Check method and remedy

- 16 -
[ V Troubleshooting ]
1500 Refrigerant
overcharge
An error can be detected
by the discharge temper-
ature superheat and by
the liquid level of an ac-
cumulator shown below.
1.If the liquid level of an
accumulator AL=2
(overflow level) is de-
tected during opera-
tion (the first
detection), the outdoor
unit stops at once,
turns to anti-restart
mode for 3 minutes,
and restarts after 3
minutes automatically.
(1) Overcharged refrigerant
(2) Liquid level heater discon-
nection
(3) Heater failure by control
board failure
Check the refrigerant amount.
(4) Thermistor failure (TH3,
TH4)
Check the pressure sensor
(5) Themistor input circuit on
the main board or pressure
sensor input circuit failure
Check the temperature and the pres-
sure of the sensor with LED monitor.
(6) Faulty mounting of ther-
mistor (TH1, TH3, TH4)
2.If the liquid level of an
accumulator AL=2
(overflow level) is de-
tected again within 30
minutes after first stop
of the outdoor unit (the
second detection), the
outdoor unit will make
an error stop, and the
error code "1500" is
displayed.
3.If the liquid level of an accu-
mulator AL=2 (overflow lev-
el) is detected more than 30
minutes after the outdoor
unit stops, and the operation
described in step 1 above
will start.
4.For 30 minutes after the stop
of the outdoor unit, prelimi-
nary errors will be displayed
on the LED display.
5.When the inhibiting switch (SW2-
4) for abnormal draw turns on, the
operation described in step 1
above will start on the outdoor unit
even in the second detection or
later.
2500 Water leakage When the drain pump
OFF, the drain sensor de-
tects water or its tip be-
comes immersed in
water.
(1) Water leakage due to
problems with such equip-
ment as a humidifier
Check for water leakage around the
humidifier and clogging of outlet of
the drain pan.
2502 Drain pump
failure
The drain sensor detects
water or its tip becomes
immersed in water in 3
min. or later after the
drain pump turns on. The
sensor detects submer-
gence when the tempera-
ture rises within 20deg in
40 sec. from the start of
indirectly heated heater
on the drain sensor runs,
or the temperature of the
drain sensor is 63°C
[145°F] or less after 40
sec. or later.
(1) Drain water level rises and
the drain sensor became
immersed in water.
Check the drain pump
(2) Disconnected the indirectly
heated heater on the drain
sensor.
Measure the resistance value of the
indirectly heated heater on the drain
sensor. (Normal value is 82 ohm be-
tween 1-3 of CN50)
(3) The detection circuit
(board) failure
If no fault is found, the indoor board
is faulty.
(4) LEV in the indoor unit fail-
ure.
When the in door unit is operated in
fan mode, check the rise of TH2 and
TH3 nearly the room temperature.
2503 Drain sensor
failure
When a short or an open
is detected during opera-
tion (cannot be detected
during OFF).
Short :
detectable at 90°C
[194°F] or higher
Open :
detectable at
-40°C [-40°F] or lower
(1) Thermistor failure
(2) Connector contact failure
(loose connector)
(3) Disconnected wire or par-
tial disconnected ther-
mistor wire
Check the thermistor resistance.
0°C [32°F]: 15kΩ
10°C [50°F]: 9.7kΩ
20°C [68°F]: 6.4kΩ
30°C [86°F]: 4.3kΩ
40°C [104°F]: 3.1kΩ
(4) Indoor board (detection cir-
cuit) failure
Check the connector contact.
If no fault is found, the indoor board
is a failure.
2600 Water leakage - Water leaks from the pipes in
such as the humidifier.
Check the location of the leak.
2601 Water supply
cut-off
- (1) The water tank of the hu-
midifier is empty.
Check the amount of supply water.
Check for the solenoid valve and for
the connection.
(2) The solenoid valve for hu-
midification is OFF.
Check the connector.
(3) Disconnected float switch Check the connecting part.
(4) Poor operation of float
switch
Check for the float switch.
(5) Frozen water tank Turn off the power source of the wa-
ter tank to defrost, and turn it on
again.
Error Code Error definition and error
detection method Cause Check method and remedy

- 17 -
[ V Troubleshooting ]
4102 Open phase 1.When turning on the
power, the operation
cannot be started be-
cause of the open
phase of one of the
power lines (R, S, T).
(1) Power supply error
Open phase of power
supply voltage
Power-supply voltage
drop
Check the voltage of the power sup-
ply terminal block (TB1)
(2) Faulty wiring or the trance
failure
Between the power sup-
ply terminal block TB1
and the main board CN20
Measure voltages between pins 3, 5
and 7 of the connector CN20 on the
main board. If the voltage does not
be measured 180VAC or more, the
wiring is faulty.
Between the high pres-
sure switch 63H1, H2 and
the main board CN38
Check whether the connector CN38
on the main board is connected.
Check the open wiring to CN38.
(3) The fuse on the main
board failure
Check whether the fuses on the main
board (F01, F02) are blown.
(4) The main board failure If the above faults are not found, the
main board is faulty.
4103 Reverse
phase/Open
phase
1.The operation cannot
be started because of
the reserve phase of
one of the power lines
(R, S, T).
(1) Faulty wiring Check whether the phase of the
power supply terminal block (TB1) is
normal.
Check the wiring between the power
supply terminal block (TB1) and the
main boards (CN20).
(2) Main board failure If the above faults are not found, the
main board is faulty.
2.When turning on the
power, the operation
cannot be reversed
because of the open
phase of one of the
power lines (R, S, T).
(1) Check 4102 error
4115 Power supply
sync signal ab-
normality
The frequency cannot be
determined when the
power is switched on.
(The frequency cannot be
detected or the outdoor
fan cannot be controlled
by phase control.)
(1) Power supply error Check the voltage of the power sup-
ply terminal block (TB1).
(2) A fuse in the control box is
blown
Check the fuse F1, F2 on the main
board.
(3) Faulty wiring or the trance
failure
Measures voltages between pins 1,
5 and 7 of the connector CN20 on
the main board. If the voltage does
not be measured 200VAC or more,
the wiring is faulty.
(4) Main board failure If none of the items described above
is applicable, and if the trouble reap-
pears even after the power is
switched on again, replace the MAIN
board.
Error Code Error definition and error
detection method Cause Check method and remedy
TB1
R 7Pin
S 5Pin
T 3Pin
CN20

- 18 -
[ V Troubleshooting ]
4116 RPM error [PKFY-AM only]
1.If the fan rotation
speed is detected to
180rpm or lower, or
2000rpm or more dur-
ing the fan operation in
the indoor unit, the unit
stops once, turns to
anti-restart mode for 3
minutes, and makes
fan to stop for 30 sec-
onds.
2.If the fan rotation
speed is detected to
180rpm or lower, or
2000rpm or more
again when the restart
operation after 30 sec-
onds since the fan
stops, the unit makes
an error stop (fan also
stops), and the error
code "4116" will ap-
pear.
(1) The connector for fan rota-
tion speed detection
(CN33) on the indoor con-
trol board is blown
Check whether the connector for fan
rotation speed detection (CN33) on
the indoor control board is blown.
(2) The connector for fan out-
put (FAN 1) on the indoor
power board is blown
Check whether the connector for fan
output (FAN 1) on the indoor power
board is blown
(3) Disconnection of the con-
nector for fan rotation
speed detection (CN33) on
the indoor control board or
the connector for fan out-
put (FAN 1) on the indoor
power board
Check whether the wiring is discon-
nected.
(4) Clogged filter Check the filter.
(5) The indoor fan motor mal-
function
Check the indoor fan motor.
(6) The circuit of fan rotation
speed detection on the in-
door control board or the
circuit of fan output on the
indoor power board faulty
If the above faults are not found
(1) Malfunction occurs since the fan
is operated
Replace the indoor control
board. If the replacement does
not work, replace the indoor
power board.
(2) Malfunction occurs even though
the fan is not operated
Replace the indoor power
board.
Motor abnor-
mality
[LOSSNAY only]
1.The motor keep run-
ning even if the power
is OFF.
2.The thermal overload
relay is ON. (Only for
the three-phase mod-
el)
(1) Board failure Replace the board.
(2) Motor malfunction
(3) Solenoid switch malfunc-
tion
Check for the motor and the solenoid
switch.
Error Code Error definition and error
detection method Cause Check method and remedy

- 19 -
[ V Troubleshooting ]
4121 Harmonics ac-
tion device er-
ror
Active filter (Communica-
tion error to PAC-
KB50AAC)
(1) Connecting switch to the
active filter in the indoor
unit is turned on, though
the unit is not connected to
the filter.
Turn the connecting switch to the ac-
tive filter in the outdoor unit (DIP
switch on the outdoor control board
SW3-8) off.
(2) Wiring error Check whether the power supply wir-
ing of the active filter is connected to
the power supply terminal block in
the indoor unit.
Check the contact between the con-
nector of the main board CN51 and
CN3S (3D) to the active filter.
(3) Active filter failure Check details with LED2-LED5 on
the board of the active filter.
* Before decomposition process,
wait for 10 minutes or more since
the power supply is cut. Then con-
firm CHARGE (LED1) is turned off
and the charge voltage is low
enough to process.
* Check the active filter when it is in
failure.
4200 VDC sensor/
Circuit failure
If Vdc 150V or less or
400V or more is detected
before Inverter operation
(1) Connected to wrong volt-
age
Check the power supply voltage by
power supply terminal block (TB1)
(2) INV board failure If the power supply has no faults, re-
place the INV board.
Error Code Error definition and error
detection method Cause Check method and remedy
LED2 LED3 LED4 LED5 Displayed contents
OFF OFF OFF OFF AF stop
ON OFF OFF OFF AF in operation
OFF ON OFF OFF OC (Over-current) error
OFF Blink1 OFF OFF Blown CN4 (Blink1: 1 sec. in-
terval)
OFF Blink2 OFF OFF Faulty wiring of ACCT (Blink 2:
0.5 sec. interval)
OFF OFF ON OFF OV (Over-current) error
OFF OFF Blink OFF OV (Over-current) repetition er-
ror
OFF OFF OFF ON OH (Heat sink, Thermo-ON)
failure
OFFONONON
Power supply surroundings fail-
ure (Power failure, Voltage rise/
drop)
OFF Blink Blink Blink
Power supply surroundings
preliminary failure (Power fail-
ure, Voltage rise/drop)