Mitsubishi Electric Mr. Slim PSA-RP71KA User manual

SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
CONTENTS
1. REFERENCE MANUAL ..................................2
2. SAFETY PRECAUTION ..................................3
3. PARTS NAMES AND FUNCTIONS ................5
4. SPECIFICATIONS ...........................................7
5. NOISE CRITERION CURVES.........................9
6. OUTLINES AND DIMENSIONS.....................10
7. WIRING DIAGRAM........................................ 11
8. REFRIGERANT SYSTEM DIAGRAM...........12
9. TROUBLESHOOTING...................................13
10. SPECIAL FUNCTION ....................................23
11. DISASSEMBLY PROCEDURE......................26
[Service Ref.]
PSA-RP71KA
PSA-RP100KA
PSA-RP125KA
PSA-RP140KA
September 2018
Notes:
• This manual describes only
service data of the indoor
units.
PARTS CATALOG (OCB528)
Model name
indication
Indoor unit
[Model Name]
PSA-RP71KA
PSA-RP100KA
PSA-RP125KA
PSA-RP140KA
No. OCH528
REVISED EDITION-B
Revision:
• Some descriptions have been
modified.
OCH528 REVISED EDITION-A
is void.

2 3
OCH528B
1REFERENCE MANUAL
1-1. OUTDOOR UNIT’S SERVICE MANUAL
1-2. TECHNICAL DATA BOOK
Model Name Service Ref. Service Manual No.
PUHZ-ZRP71VHA
PUHZ-ZRP100/125/140VKA
PUHZ-ZRP100/125/140YKA
PUHZ-ZRP71VHA
PUHZ-ZRP71VHAR1(-ER/ET)
PUHZ-ZRP100/125/140VKA
PUHZ-ZRP100/125/140YKA(R1)
OCH527/OCB527
PUHZ-P100/125/140VHA3
PUHZ-P100/125/140YHA
PUHZ-P100YHA2
PUHZ-P100/125/140VHA3.UK
PUHZ-P100/125/140VHA3R1.UK
PUHZ-P100/125/140VHA3R2.UK
PUHZ-P125/140VHA3R3.UK
PUHZ-P100/125/140YHA.UK
PUHZ-P100/125/140YHAR1.UK
PUHZ-P125/140YHAR2.UK
PUHZ-P100YHA2.UK
OCH415/OCB415
PU(H)-P71/100VHA
PU(H)-P71/100/125/140YHA
PU(H)-P71/100VHA#1.UK
PU(H)-P71/100VHA#2.UK
PU(H)-P71/100VHA#3.UK
PU(H)-P71/100/125/140YHA#1.UK
PU(H)-P71/100/125/140YHA#2.UK
PU(H)-P71/100/125/140YHAR3.UK
PU(H)-P125/140YHAR4(R5/R6).UK
OC379
Series (Outdoor unit) Manual No.
PUHZ-P • VHA
PUHZ-P • YHA OCS17
PU(H)-P • VHA
PU(H)-P • YHA OCS07

3
OCH528B
Cautions for units utilizing refrigerant R410A
CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
Use ester oil, ether oil, or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
In case of using the existing pipes for R22, be careful with
the following.
· Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust, or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enter, that can cause deterio-
ration of refrigerant oil, etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
2SAFETY PRECAUTION

54 5
OCH528B
Unit
Electronic weighing scale
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[1] Cautions for service
(1) Perform service after collecting the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3Electronic weighing scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A Top of cylinder (Pink)
Cylinder with syphon
8Refrigerant recovery equipment —

5
OCH528B 5
Disperses air
up and down Disperses air left
and right.
Removes dust and pollutants from intake air.
(Intakes air from room.)
PARTS NAMES AND FUNCTIONS
3
•Controller
Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
Indoor Unit
•Operation buttons
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
Set Temperature buttons
Down
Up
Timer Menu button
(Monitor/Set button)
Mode button (Return button)
Set Time buttons
Back
Ahead
Timer On/Off button
(Set Day button)
ON/OFF button
Fan Speed button
Filter button
(<Enter> button)
Test Run button
Check button (Clear button)
Airflow Up/Down button
Louver button
(Operation button)
To preceding operation
number.
Ventilation button
(Operation button)
To next operation number.
Opening
the door

76 7
OCH528B
For the purposes of explanation,
all parts of the display are shown.
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 supported.)
“Centrally Controlled” indicator
Indicates that operation of the re-
mote controller has been prohib-
ited by a master controller.
“Timer Is Off” indicator
Indicates that the timer is off.
Temperature Setting
Shows the target temperature.
Day-of-Week
Shows the current day of the week.
Time/Timer Display
Shows the current time, unless the simple orAuto 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 but-
tons 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 corre-
sponding timer is set.
Up/Down Air Direction indica-
tor
The indicator shows the direc-
tion of the outgoing airflow.
“One Hour Only” indicator
Displayed if the airflow is set to
weak and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di-
rection 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 at the indoor unit, the remote controller will display the “Not Available”
message.
If you are using the remote controller to drive multiple indoor units, this message will appear only if he feature is not present
at the parent unit.
When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication
(For maximum 2 minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.
•Display

7
OCH528B 7
SPECIFICATIONS
4
kW
A
kW
K/min(CFM)
Pa(mmAq)
kW
dB
mm (inch )
mm (inch)
mm (inch)
mm (inch)
kg (lbs)
Service Ref.
Mode
Power supply(phase, cycle, voltage)
Input
Running current
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Airflow(Low-Middle-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level(Low-Middle-High)
Unit drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PSA-RP100KA
Cooling
0.11
0.71
Heating
0.10
0.66
Single phase, 50Hz, 230V
Munsell 0.70Y 8.59/0.97
Plate fin coil
Centrifugal (direct) o1
0.16
25-28-30(893-1,000-1,071)
0(direct blow)
—
Remote controller & built-in
45-49-51
20 (13/16)
600 (23-5/8)
360 (14-11/64)
1,900 (74-13/16)
46 (102)
Cooling
0.06
0.40
Heating
0.06
0.40
Single phase, 50Hz, 230V
Munsell 0.70Y 8.59/0.97
Plate fin coil
Centrifugal (direct) o1
0.12
20-22-24 (714-786-857)
0 (direct blow)
—
Remote controller & built-in
40-42-44
20 (13/16)
600 (23-5/8)
360 (14-11/64)
1,900 (74-13/16)
46 (102)
PSA-RP71KA
kW
A
kW
K/min(CFM)
Pa(mmAq)
kW
dB
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg (lbs)
Service Ref.
Mode
Power supply(phase, cycle, voltage)
Input
Running current
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Airflow(Low-Middle-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level(Low-Middle-High)
Unit drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
Cooling
0.11
0.73
Heating
0.11
0.73
Single phase, 50Hz, 230V
Munsell 0.70Y 8.59/0.97
Plate fin coil
Centrifugal (direct) o1
0.16
25-28-31(893-1,000-1,107)
0 (direct blow)
—
Remote controller & built-in
45-49-51
20 (13/16)
600 (23-5/8)
360 (14-11/64)
1,900 (74-13/16)
46 (102)
PSA-RP125KA
kW
A
kW
K/min(CFM)
Pa(mmAq)
kW
dB
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg (lbs)
Service Ref.
Mode
Power supply(phase, cycle, voltage)
Input
Running current
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Airflow (Low-Middle-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Middle-High)
Unit drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT

98 9
OCH528B
kW
A
kW
K/min(CFM)
Pa(mmAq)
kW
dB
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg (lbs)
Service Ref.
Mode
Power supply(phase, cycle, voltage)
Input
Running current
External finish
Heat exchanger
Fan Fan(drive) x No.
Fan motor output
Airflow (Low-Middle-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Middle-High)
Unit drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PSA-RP140KA
Cooling
0.11
0.73
Heating
0.11
0.73
Single phase, 50Hz, 230V
Munsell 0.70Y 8.59/0.97
Plate fin coil
Centrifugal (direct) o1
0.16
25-28-31(893-1,000-1,107)
0 (direct blow)
—
Remote controller & built-in
45-49-51
20 (13/16)
600 (23-5/8)
360 (14-11/64)
1,900 (74-13/16)
48 (106)

9
OCH528B 9
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB ( 0dB = 0.0002 µbar )
BAND CENTER FREQUENCIES, Hz
PSA-RP71KA
NOTCH
High
Middle
Low
SPL(dB)
44
42
40
LINE
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB ( 0dB = 0.0002 µbar )
BAND CENTER FREQUENCIES, Hz
PSA-RP100KA
PSA-RP125KA NOTCH
High
Middle
Low
SPL(dB)
51
49
45
LINE
NOISE CRITERION CURVES
5
1 m
1 m
Main unit
about 1.4 m
MICROPHONE
floor
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB ( 0dB = 0.0002 µbar )
BAND CENTER FREQUENCIES, Hz
PSA-RP140KA
NOTCH
High
Middle
Low
SPL(dB)
51
49
45
LINE

10 11
OCH528B
260
240
300 or more
PSA?|RP71/100/125/140KA
BH01B748
761
*1
*1. Service access allows for insertion of screw driver. *2. Adjustable
Front 1,000 or more
*2
Drain pipe
Gas pipe: 15.88(5/8F)
Liquid pipe: 9.52(3/8F)
Electrical parts box
Terminal block for indoor/outdoor connection
Knockout hole for bottom fixing 4- 10 hole
Knockout hole for under-piping (120×70 oval)
Knockout hole for under-piping
Front side
Rear side
Knockout hole for piping and wiring (140×80 oval)
Knockout hole for wiring 27 (Provided on both sides)
Knockout hole for refrigerant and drainage 90×60 oval (Provided on both sides)
Controller
Metal fixture against overturning
Knockout hole for branch duct
Front side
Rear side
240
10
38
38 15
111
77
115
70 260
*100 or more *100 or more
5 or more
140
20
24566
47
95
461
22
123
714
99
254
120
277
218
201
120
600
50
360
310
10
125
340
130 132
100
370
40
520
40
10 20
129 71
130 140 260
820
1900
599
181
834
524
30
105
20
590
480
110
261
PSA-RP71KA
PSA-RP100KA
PSA-RP125KA
PSA-RP140KA
Unit : mm (inch)
OUTLINES AND DIMENSIONS
6

11
OCH528B
PSA-RP71KA PSA-RP100KA PSA-RP125KA PSA-RP140KA
TO
OUTDOOR
UNIT
SYMBOL NAME SYMBOL NAME SYMBOL NAME
I.B I.B
INDOOR CONTROLLER BOARD
FUSE FUSE (T6.3AL250V)
CN2L CONNECTOR<LOSSNAY>
CN32 CONNECTOR<REMOTE SWITCH>
CN41 CONNECTOR<HA TERMINAL-A>
CN51 CONNECTOR<CENTRALLY CONTROL>
SW1
SWITCH <MODEL SELECTION >* See Table 1.
SW2 SWITCH <CAPACITY CODE >* See Table 2.
SWE SWITCH<EMERGENCY OPERATION>
X1 RELAY<LOUVER>
POWER SUPPLY<R.B>
LED1 POWER SUPPLY<I.B>
LED2 TRANSMISSION<INDOOR-OUTDOOR>LED3
WIRED REMOTE CONTROLLER BOARD
TERMINAL BLOCK<REMOTE CONTROLLER
TRANSMISSION LINE>
R.B TB6
DCL
MF
ML
LOUVER MOTOR
FAN MOTOR
REACTOR
TB2
TERMINAL BLOCK
<INDOOR/OUTDOOR CONNECTING LINE>
TB4
TERMINAL BLOCK
option for PSA-RP.KA models.
ROOM TEMPERATURE THERMISTOR
<0:/15kΩ, 25:/5.4kΩ DETECT>
PIPE TEMPERATURE THERMISTOR/LIQUID
<0:/15kΩ, 25:/5.4kΩ DETECT>
COND./EVA. TEMPERATURE THERMISTOR
<0:/15kΩ, 25:/5.4kΩ DETECT>
TH1
TH2
TH5
[NOTES]
1. Symbols used in wiring diagram above are,
: Connector, : Terminal (block).
2.Indoor and outdoor connecting wires are made with
polarities, make wiring
matching terminal numbers (S1,S2,S3).
3.Since the outdoor side electric wiring may change be
sure to check the outdoor
unit electric wiring for servicing.
4.This diagram shows the wiring of Indoor and Outdoor
connecting wires (specification of 230V),
adopting superimposed system of power and signal.
*
When work to supply power separately to Indoor and
Outdoor unit was applied, refer to Fig 1.
For power supply system of this unit, refer to the caution
label located near this diagram.
13
5
1
4
1
CN22
(BU)
CN32
(WH)
CN51 (WH)
CN41 (WH)
CN2L
(RD)
OFF ON
SWE
CN20
(RD) CN44
(WH)
PAIR No.
J42 J41
SW2 SW1
LED3
LED2LED1
t° t° t°
TH2TH5TH1
TRANSMISSION
WIRE
DC12V
TB6
R.B
I.B
14
21
2 1
21
1
2
SW5
ON
OFF
12345678
74
1
X1
ML
M
1~ 3~
MF
CNP
(BU)
FUSE
POWER SUPPLY
~ (1PHASE)
230V 50Hz
YE
OG
OG
BN
YE
OG
CN3C
(BU)
+−
CNMF
(WH)
MS
1
3
13
*
*
531
CN01
(BK)
CN90
(WH)
TB4
S1
S2
S3
2
BK
TO
OUTDOOR
UNIT
CN01
(BK)
CN3C
(BU)
1
3
5
BU
GNYE
RD OG
YE YE
I.B
TB2
OG
OG
YE
BN
1
3
S1
S2
S3
L
N
TB4
<Fig.1>
Refer to tables 1
and 2 for service PCB
Manufacture/Service
SW2
Table 2
1 2 3 4 5
MODELS
Manufacture/Service
MODELS
PSA-RP71KA
PSA-RP100KA
PSA-RP125KA
PSA-RP140KA
ON
OFF
1 2 3 4 5 ON
OFF
1 2 3 4 5 ON
OFF
1 2 3 4 5 ON
OFF
Manufacture/Service
SW1
Table 1
1 2 3 4 5
MODELS
PSA-RP.KA
ON
OFF
*Be sure to turn off the source power
and then disconnect fan motor connector.
(Failure to do so will cause
trouble in Fan motor)
DCL
DCL
CN105
(RD)
WIRING DIAGRAM
7

12 13
OCH528B
Pipe temperature
thermistor/liquid
(TH2)
Distributor
with strainer
#50
Condenser/evaporator
temperature thermistor
(TH5)
Room temperature
thermistor (TH1)
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer
#50
Strainer
#50
Heat exchanger Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
REFRIGERANT SYSTEM DIAGRAM
8
PSA-RP71KA PSA-RP100KA PSA-RP125KA PSA-RP140KA

13
OCH528B
TROUBLESHOOTING
9
<Check code display by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the wired remote controller or controller board of out-
door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
9-1. TROUBLESHOOTING
Unit conditions at service Check code Actions to be taken for service (summary)
The trouble is reoccurring. Displayed
Not displayed
Judge what is wrong and take a corrective action according
to “9-3. SELF-DIAGNOSIS ACTION TABLE”.
Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING
OF PROBLEMS”.
The trouble is not reoccurring.
Logged
Not logged
1 Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
2
Reset check code logs and restart the unit after finishing
service.
3 There is no abnormality in electrical component,
controller board, remote controller, etc.
1 Re-check the abnormal symptom.
2 Conduct troubleshooting and ascertain the cause of
the trouble according to “9-4. TROUBLESHOOTING
OF PROBLEMS”.
3 Continue to operate unit for the time being if the cause
is not ascertained.
4 There is no abnormality concerning of parts such as
electrical component, controller board, remote controller, etc .

14 15
OCH528B
9-2. SELF-DIAGNOSIS ACTION TABLE Note: Refer to the manual of outdoor unit for the details of display
such as F, U, and other E.
Check Code
Abnormal point and detection method
Cause Countermeasure
P1
P2
Room temperature thermistor (TH1)
1The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3
minutes. (The unit returns to normal
operation, if it has been reset normally.)
2Constantly detected during cooling,
drying, and heating operation.
 Short:−90:or more
 Open:−40:or less
1Defective thermistor
characteristics
2Contact failure of connector
(CN20) on the indoor controller
board (Insert failure)
3Breaking of wire or contact
failure of thermistor wiring
4Defective indoor controller
board
1–3Check resistance value of thermistor.
0:.... 15.0 k"
10:.... 9.6 k"
20:.... 6.3 k"
30:.... 4.3 k"
40:.... 3.0 k"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor,
breaking of wire or contact failure can be
detected.
2
Check contact failure of connector (CN20)
on the indoor controller board. Refer to "9-5.
TEST POINT DIAGRAM". Turn the power
on again and check restart after inserting
connector again.
4Check room temperature display on remote
controller.
Replace indoor controller board if there
is abnormal difference with actual room
temperature.
Turn the power off, and on again to operate
after check.
Pipe temperature thermistor/Liquid
(TH2)
1The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3
minutes. (The unit returns to normal
operation, if it has been reset normally.)
2Constantly detected during cooling,
drying, and heating (except defrosting)
operation
Short: 90:or more
 Open:−40:or less
1Defective thermistor
characteristics
2Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3Breaking of wire or contact
failure of thermistor wiring
4Defective refrigerant circuit is
causing thermistor temperature
of 90:ormoreor−40:or
less.
5Defective indoor controller
board
1–3Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2Check contact failure of connector (CN44)
on the indoor controller board. Refer to "
9-5.
TEST POINT DIAGRAM
". Turn the power on
and check restart after inserting connector
again.
4Check 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.
5Check pipe <liquid> temperature with
remote controller in test run mode. If there is
extremely difference with actual pipe <liquid>
temperature, replace indoor controller board.
Turn the power off, and on again to operate
after check.
P6
Freezing/overheating protection is
operating
1Freezing protection (Cooling mode)
The unit is in 6-minute resume
prevention mode if pipe <liquid or
condenser/evaporator> temperature
stays under −15:for 3 minutes, 3
minutes after the compressor started.
Abnormal if it stays under −15:for 3
minutes again within 16 minutes after
6-minute resume prevention mode.
2Overheating protection (Heating mode)
The units is in 6 minute resume
prevention mode if pipe <condenser/
evaporator> temperature is detected as
over 70:after the compressor started.
Abnormal if the temperature of over
70:is detected again within 30 minutes
after 6 minute resume prevention mode.
(Cooling or drying mode)
1Clogged filter (reduced airflow)
2Short cycle of air path
3Low-load (low temperature)
operation out of the tolerance
range
4Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is
defective.
5Defective outdoor fan control
6Overcharge of refrigerant
7Defective refrigerant circuit
(clogs)
(Heating mode)
1Clogged filter (reduced airflow)
2Short cycle of air path
3Overload (high temperature)
operation out of the tolerance
range
4Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is
defective.
5Defective outdoor fan control
6Overcharge of refrigerant
7Defective refrigerant circuit
(clogs)
8Bypass circuit of outdoor unit
is defective.
(Cooling or drying mode)
1Check clogs of the filter.
2Remove blockage.
4Refer to "9-4. HOW TO CHECK THE
PARTS".
5Check outdoor fan motor.
67 Check operating condition of refrigerant
circuit.
(Heating mode)
1Check clogs of the filter.
2Remove blockage.
4Refer to "9-4. HOW TO CHECK THE
PARTS".
5Check outdoor fan motor.
6–8Check operating condition of refrigerant
circuit.

15
OCH528B
Check Code
Abnormal point and detection method Cause Countermeasure
P8
1Slight 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
2Converse connection of
extension pipe (on plural units
connection)
3Converse wiring of indoor/
outdoor unit connecting wire
(on plural units connection)
4Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
5Stop valve is not opened
completely.
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°C ] (TH−TH1)
TH: Lower temperature between:
liquid pipe temperature (TH2) and
condenser/evaporator temperature
(TH5)
TH1: Intake temperature
<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in
heating range within 20 minutes.
Note 3: It takes at least 27 minutes to
detect abnormality.
Note 4: It excludes the period of defrosting.
(Detection restarts when defrosting
mode is over.)
Heating range: 3°C [ (TH5−TH1)
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.
23Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool(PAC-SK52ST)’.
()
P9
Pipe temperature thermistor /
Condenser-Evaporator (TH5)
1The unit is in 3-minute resume protection
mode if short/open of thermistor is
detected. Abnormal if the unit does not
get back to normal within 3 minutes. (The
unit returns to normal operation, if it has
been reset normally.)
2Constantly detected during cooling,
drying, and heating operation (except
defrosting)
Short: 90:or more
Open: −40:or less
1Defective thermistor
characteristics
2Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3Breaking of wire or contact
failure of thermistor wiring
4Temperature of thermistor is
90:or more or −40:or less
caused by defective refrigerant
circuit.
5Defective indoor controller
board
1–3 Check resistance value of thermistor.
For characteristics, refer to (P1).
2Check contact failure of connector (CN44) on
the indoor controller board.
Refer to "9-5. TEST POINT DIAGRAM".
Turn the power on and check restart after
inserting connector again.
4Operate in test run mode and check pipe
<condenser/evaporator> temperature with
outdoor controller circuit board. If pipe
<condenser/evaporator> temperature is
extremely low (in cooling mode) or high (in
heating mode), refrigerant circuit may have
defect.
5Operate in test run mode and check pipe
<condenser/evaporator> temperature
with outdoor control circuit board. If there
is extreme difference with actual pipe
<condenser/evaporator> temperature, replace
indoor controller board.
There is no abnormality if none of above
comes within the unit.
Turn the power off and on again to operate.
In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service
tool (PAC-SK52ST).
()

16 17
OCH528B
Check Code
Abnormal point and detection method Cause Countermeasure
E0
or
E4
Remote controller transmission
error(E0)/signal receiving error(E4)
1Abnormal if main or sub remote controller
cannot receive any transmission
normally from indoor unit of refrigerant
address “0” for 3 minutes.
(Check code: E0)
2Abnormal if sub remote controller could
not receive any signal for 2 minutes.
(Check code: E0)
1Abnormal if indoor controller board can
not receive any data normally from
remote controller board or from other
indoor controller board for 3 minutes.
(Check code: E4)
2Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Check code: E4)
1Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2Set one of the remote controllers “main”
if there is no problem with the action above.
3Check wiring of remote controller.
• Total wiring length: maximum 500 m
(Do not use cable × 3 or more.)
• The number of connecting indoor units:
maximum 16 units
• The number of connecting remote
controller: maximum 2 units
If the cause of trouble is not any of 1–3above,
4Diagnose remote controllers.
• When using 2 remote controllers, the
maximum wiring length for the remote
controller cables is 200 m.
a) When “RC OK” is displayed,
Remote controllers have no problem.
Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
b) When “RC NG” is displayed,
Replace remote controller.
c) When “RC E3” or “ERC 00-66” is
displayed, noise may be causing
abnormality.
Note: If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.
E3
or
E5
Remote controller transmission
error(E3)/signal receiving error(E5)
1Abnormal if remote controller could not
find blank of transmission path for 6
seconds and could not transmit.
(Check code: E3)
2Remote controller receives transmitted
data at the same time and compares the
received and transmitted data. Abnormal
if these data are judged to be different
30 continuous times. (Check code: E3)
1Abnormal if indoor controller board could
not find blank of transmission path.
(Check code: E5)
2Indoor controller board receives
transmitted data at the same time and
compares the received and transmitted
data. Abnormal if these data are judged
to be different 30 continuous times.
(Check code: E5)
1Set a remote controller to main, and the
other to sub.
2Remote controller is connected with only one
indoor unit.
3The address changes to a separate setting.
4–6 Diagnose remote controller.
a) When “RC OK” is displayed, remote
controllers have no problem.
Turn the power off,and on again to check.
When becoming abnormal again, replace
indoor controller board.
b) When “RC NG” is displayed, replace
remote controller.
c) When “RC E3” or “ERC 00-66” is
displayed, noise may be causing
abnormality.
1Contact failure at transmission
wire of remote controller
2All 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.
3Miswiring of remote controller
4Defective transmitting receiving
circuit of remote controller
5Defective transmitting receiving
circuit of indoor controller board
of refrigerant addresses “0”.
6Noise has entered into the
transmission wire of remote
controller.
12 remote controllers are set as
“main.”
(In case of 2 remote controllers)
2Remote controller is connected
with 2 indoor units or more.
3Repetition of refrigerant
address
4Defective transmitting receiving
circuit of remote controller
5Defective transmitting receiving
circuit of indoor controller board
6Noise has entered into
transmission wire of remote
controller.
E6
1Contact failure, short circuit or,
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2Defective transmitting receiving
circuit of indoor controller board
3Defective transmitting receiving
circuit of indoor controller board
4Noise has entered into indoor/
outdoor unit connecting wire.
Note: Check LED display on the outdoor
control circuit board. (Connect
A-control service tool, PAC-SK52ST.)
Refer to outdoor unit service manual.
1 Check disconnection or looseness of
indoor/ outdoor unit connecting wire of
indoor unit or outdoor unit.
Check all the units in case of twin triple
indoor unit system.
2–4Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board or
outdoor controller circuit board.
Note: Other indoor controller board may have
defect in case of twin triple indoor unit
system.
Indoor/outdoor unit communication
error (Signal receiving error)
1Abnormal if indoor controller board can
not receive any signal normally for 6
minutes after turning the power on.
2Abnormal if indoor controller board can
not receive any signal normally for 3
minutes.
3Consider the unit abnormal under the
following condition: When 2 or more
indoor units are connected to an outdoor
unit, indoor controller board cannot
receive a signal for 3 minutes from
outdoor controller circuit board, a signal
which allows outdoor controller circuit
board to transmit signals.

17
OCH528B
E7
Check Code
Abnormal point and detection method
Cause Countermeasure
Fb
E1
or
E2
PA
Forced compressor stop
(due to water leakage abnormality)
1When the intake temperature subtracted
with liquid pipe temperature is less than
−10:, drain sensor is detected whether
it is soaked in the water or not at the
interval of 90 seconds. (Drain pump will
start operating when the drain sensor is
detected to be soaked in the water.)
2The unit has a water leakage abnormality
when the following conditions, a and b,
are satisfied while the above-mentioned
detection is performed.
a) The drain sensor is detected to be
soaked in the water 10 times in a row.
b) The intake temperature subtracted
with liquid pipe temperature is detected
to be less than −10:for a total of 30
minutes.
(When the drain sensor is detected to be
NOT soaked in the water, the detection
record of a and b will be cleared.)
3The drain sensor detection is performed
in operations other than cooling. (When
the unit stops operating, during heating
or fan operation, when the unit stops
because of some abnormality)
Note: Once the water leakage abnormality
is detected, abnormality state will
not be released until the main
power is reset.
1Drain pump trouble
2Drain defective
· Drain pump clogging
· Drain pipe clogging
3Open circuit of drain sensor
side heater
4Contact failure of drain sensor
connector
5Dew condensation on drain
sensor
· Drain water descends along
lead wire.
· Drain water waving due to filter
clogging.
6Extension piping connection
difference at twin, triple,
quadruple system.
7Mis-wiring of indoor/ outdoor
connecting at twin, triple,
quadruple system.
8Room temperature thermistor/
liquid pipe temperature
thermistor detection is defective.
1Check the drain pump.
2Please confirm whether water can be
drained.
3Confirm the resistance of the drain sensor.
4Check the connector contact failure.
5Check the drain sensor lead wire mounted.
Check the filter clogging
6Check the piping connection.
7Check the indoor/ outdoor connecting wires.
8Check the room temperature display of
remote controller.
Check the indoor liquid pipe temperature
display of outdoor controller board.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.
1Defective transmitting receiving
circuit of indoor controller board
2Noise has entered into power
supply.
3Noise has entered into outdoor
control wire.
1–3Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
Indoor controller board
Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.
1Defective indoor controller
board 1Replace indoor controller board.
Remote controller control board
1Abnormal if data cannot be read nor-
mally from the nonvolatile memory of the
remote controller control board.
(Check code: E1)
2Abnormal if the clock function of remote
controller cannot be operated normally.
(Check code: E2)
1Defective remote controller 1Replace remote controller.
PL
Abnormal refrigerant circuit
During Cooling, Dry, or Auto Cooling
operation, when the following are
regarded as failures when detected for
one second.
a)The compressor continues to run for 30
or more seconds.
b)The liquid pipe temperature or the
condenser/evaporator temperature is
75°C or more.
These detected errors will not be
cancelled until the power source is
reset.
1Abnormal operation of 4-way
valve
2Disconnection of or leakage in
refrigerant pipes
3Air into refrigerant piping
4Abnormal operation (no rotation)
of indoor fan
· Defective fan motor.
· Defective indoor control board.
5Defective refrigerant circuit
(clogging)
1When this error occurs, be sure to replace
the 4-way valve.
2Check refrigerant pipes for disconnection or
leakage.
3After the recovery of refrigerant, vacuum dry
the whole refrigerant circuit.
4Refer to section "9-4-2. DC Fan motor (fan
motor/indoor controller board)".
5Check refrigerant circuit for operation.
To avoid entry of moisture or air into
refrigerant circuit which could cause
abnormal high pressure, purge air in
refrigerant circuit or replace refrigerant.
EE
1 Unauthorized connection of
indoor unit and outdoor unit
Connections other than below
combination are not authorized;
Outdoor unit: Models with R32 refrigerant
Indoor unit: Floor standing type indoor
unit (PSA-KA)
1Alter the connection referring to the combi-
nation as shown in the “cause” column.
Abnormal if a connection of indoor unit
and outdoor unit which uses different
refrigerant is detected.

18 19
OCH528B
(For the separate indoor/outdoor unit power sup-
ply system)
1Power supply of 220–240 V AC is not supplied to
indoor unit.
2The connectors of the optional replacement kit are
not used.
3Defective indoor controller board.
9-3. TROUBLESHOOTING BY INFERIOR PHENOMENA
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
Phenomena Cause Countermeasure
(1) LED2 on indoor controller board
is off. • When LED1 on indoor controller board is also off.
1Power supply of rated voltage is not supplied to out-
door unit.
2Defective outdoor controller circuit board.
3Power supply of 220–240 V is not supplied to indoor
unit.
4Defective indoor controller board.
1Check the voltage of outdoor power supply
terminal block (L, N) or (L3, N).
• When 220–240 V AC is not detected.
Check the power wiring to outdoor unit
and the breaker.
• When 220–240 V AC is detected.
—Check 2(below).
2Check the voltage between outdoor terminal
block S1 and S2.
• When 220–240 V AC is not detected.
Check the fuse on outdoor controller cir-
cuit board.
Check the wiring connection.
• When 220–240 V AC is detected.
—Check 3(below).
3Check the voltage between indoor terminal
block S1 and S2.
• When 220–240 V AC is not detected.
Check indoor/outdoor unit connecting wire
for mis-wiring.
• When 220–240 V AC is detected.
—Check 4(below).
4Check the fuse on indoor controller board.
Check the wiring connection.
If no problem is found, indoor controller board
is defective.
• When LED1 on indoor controller board is lit.
1Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant address
“0”.)
1Reconfirm the setting of refrigerant address
for outdoor unit
Set the refrigerant address to “0”.
(For grouping control system under which
2 or more outdoor units are connected, set
one of the units to “0”.)
Set refrigerant address using SW1 (3-6) on
outdoor controller circuit board.
1Check the voltage of indoor power supply
terminal block (L,N).
• When 220–240 V AC is not detected.
Check the power supply wiring.
• When 220–240 V AC is detected.
-Check 2(below).
2Check that there is no problem in the meth-
od of connecting the connectors.
• When there are problems in the method of
connecting the connectors.
Connect the connector correctly referring
to installation manual of an optional kit.
• When there is no problem in the method
of connecting the connectors.
-Check 3(below).
3Check the fuse on indoor controller board.
Check the wiring connection.
If no problem is found, indoor controller
board is defective.

19
OCH528B
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
(3) Upward/downward vane
performance failure 1The vane is not downward during defrosting and heat
preparation and when the thermostat is OFF in HEAT
mode. (Working of COOL protection function)
2Vane motor does not rotate.
• Defective vane motor
• Breaking of wire or connection failure of connector
• Up/down vane setting is “No vanes”.
3Upward/downward vane does not work.
• The vane is set to fixed position.
1Normal operation (The vane is set to
horizontal regardless of remote control.)
2Check 2(left).
• Check the vane motor. (Refer to “How
to check the parts”.)
• Check for breaking of wire or
connection failure of connector.
• Check “Up/down vane setting”. (Unit
function selection by remote controller).
3Normal operation (Each connector on
vane motor side is disconnected.)
Phenomena Cause Countermeasure
(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.
1Mis-wiring of remote controller wires
Under twin triple indoor unit system, 2 or more indoor
units are wired together.
2Refrigerant address for outdoor unit is wrong or not
set.
Under grouping control system, there are some units
whose refrigerant address is 0.
3Short-cut of remote controller wires
4Defective remote controller
Check indoor/outdoor unit connecting wire
for connection failure.
1Check the connection of remote controller
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.
2Check 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.
(4) Receiver for wireless remote
controller 1Weak batteries of wireless remote controller.
2Contact failure of connector (CNB) on wireless
remote controller receiver board.
(Insert failure)
3Contact failure of connector (CN90) on indoor
controller board. (Insert failure)
4Contact failure of connector between wireless remote
controller receiver board and indoor controller board.
1Replace batteries of wireless remote
controller.
2–4
Check contact failure of each connector.
If no problems are found of connector,
replace indoor controller board.
When the same trouble occurs even
if indoor controller board is replaced,
replace wireless remote controller
receiver board.
Parts name Check points
Disconnect the connector then measure the resistance with a tester.
(Surrounding temperature 10 to 30:)
(Refer to "9-4-1. Thermistor" for a detail.)
Room temperature
thermistor (TH1)
Pipe temperature
thermistor (TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Normal
4.3 to 9.6 k"
Abnormal
Open or short
Measure the resistance between the terminals with a tester.
(Surrounding temperature 25:)
Louver motor(ML)
Normal
11000 to 13000 "Abnormal
Open or short
9-4. HOW TO CHECK THE PARTS
PSA-RP71KA PSA-RP100KA PSA-RP125KA PSA-RP140KA

20 21
OCH528B
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
< Thermistor for lower temperature >
Temperature (:)
Resistance (K")
<Thermistor characteristic graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature thermistor (TH5)
Thermistor R0=15 k"± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
0:15 k"
10:9.6 k"
20:6.3 k"
25:5.4 k"
30:4.3 k"
40:3.0 k"
Thermistor for
lower temperature
1
273+t 1
273
9-4-2. DC Fan motor (FAN MOTOR/INDOOR CONTROLLER BOARD)
Indoor controller board fuse check
Notes
· High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble to the indoor controller circuit board and fan motor.)
Self check
Symptom : The indoor fan cannot rotate.
1
2
Wiring contact check
Contact of fan motor connector (CNMF)
No
No
Fail
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit board.
TEST POINT 1: VDC (between 1 (+) and 4 (−) of the fan connector): VDC 280 V DC
TEST POINT 2: VCC (between 5 (+) and 4 (−) of the fan connector): VCC 15 V DC
Correct the wiring.
Replace the drain pump.
Replace indoor controller board.
Replace the defective fan motor.
Replace indoor
controller board
Replace the defective fan motor.
Is the voltage normal?
Is there contact failure?
No
Yes
Yes
No
Yes
Check the operation of fan. Complete.
Complete.
Fail
OK
OK
Check the operation
Check method of DC fan motor (fan motor/indoor controller circuit board)
Is the fuse normal?
Yes
Is the resistance
between the terminals of
drain pump normal?
Replace the defective fan motor.
Replace the indoor controller board.
9-4-1. Thermistor