Mitsubishi Electric PLFY-P05NFMU-E Operating manual

Indoor unit
[Model Name] [Service Ref.]
PLFY-P05NFMU-E.TH
PLFY-P08NFMU-E.TH
PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH
PLFY-P18NFMU-E.TH
PLFY-P05NFMU-E
PLFY-P08NFMU-E
PLFY-P12NFMU-E
PLFY-P15NFMU-E
PLFY-P18NFMU-E
R410A
TECHNICAL & SERVICE MANUAL
March 2018
Notes:
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No. OCH604
REVISED EDITION-A
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INDOOR UNIT
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CONTENTS
1. SAFETY PRECAUTION..........................2
2. PARTS NAMES AND FUNCTIONS........ 4
3. SPECIFICATIONS.................................12
4. 4-WAY AIR FLOW SYSTEM.................14
5. OUTLINES AND DIMENSIONS............16
6. WIRING DIAGRAM...............................17
7.
REFRIGERANT SYSTEM DIAGRAM...... 18
8. TROUBLESHOOTING..........................19
9. DISASSEMBLY PROCEDURE............. 27
PARTS CATALOG (OCB604)

2
OCH604A
1SAFETY PRECAUTION
CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged in a 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 enters 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
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of
equipment components.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
Do not use the existing refrigerant piping.
The old refrigerant and lubricant in the existing piping
contains a large amount of chlorine which may cause the
lubricant deterioration of the new unit.
Use “low residual oil piping”
If there is a large amount of residual oil (hydraulic oil, etc.)
inside the piping and joints, deterioration of the lubricant
will result.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Micron gauge
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.

3
OCH604A
[1] Cautions for service
(1) Perform service after recovering 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) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
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Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
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4
OCH604A
2PARTS NAMES AND FUNCTIONS
2-1. Indoor Unit
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Grille
Filter
Removes dust and pollutants
from drawn in air.
Horizontal Air Outlet
Sets horizontal airflow automatically
during cooling or dehumidifying.
Air Intake
Draws in air from room.
2-2. Wired Remote Controller <PAR-32MAA> <PAC-YT53CRAU>
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Wired remote controller function
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
OCH604A
2-2-1. Wired Remote Controller <PAR-32MAA>
F2 F3 F4F1
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F1 F2 F3 F4
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ON/OFF button
When the backlight is off, pressing any button turns
the backlight on and does not perform its function.
(except for the (ON/OFF) button)
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SELECT button
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RETURN button
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MENU button
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Backlit LCD
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ON/OFF lamp
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Function button F1
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Function button F2
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Function button F3
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Function button F4
83
83
Fri
Room
Set temp.
Mode Temp. Fan
Cool Auto
Main
Main display:
Cursor Page
Main menu
Vane·Louver·Vent. (Lossnay)
High power
Timer
Weekly timer
OU silent mode
<Main display> <Main menu>
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6
OCH604A
The main display can be displayed in 2 different modes: "Full" and "Basic".
T
he initial setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting.
<Full mode> <Basic mode>
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Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.
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1Operation mode
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2Preset temperature
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3Clock (See the Installation Manual.)
4Fan speed
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5Button function guide
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CXUUeQt UooPtePSeUDtXUe DSSeDUs KeUe
1Room temperature
(See the Installation Manual.)
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Fri
Mode Temp. Fan
Room
Cool Set temp.
83
83
Fri
Cool
Mode Temp. Fan
Set temp.
83
1
1
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5
2
2
4
4
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6
8
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7
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!


OCH604A
Not all functions are available on all models of indoor units.
Energy saving
Auto return
Schedule
Night setback
Main menu Press the MENU button.
Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button.
Vane · Louver · Vent. (Lossnay)
High power
Weekly timer
Restriction
Maintenance
Initial setting
ON/OFF timer
Auto-Off timer
Temp. range
Operation lock
Manual vane angle
Main/Sub
Timer
Main display
Contrast
Display details
Auto mode
Administrator password
Language selection
Service
Input maintenance info.
Function setting
Lossnay (City Multi only)
Check
Self check
Maintenance password
Remote controller check
Test run
Clock
Filter Information
Error Information
3D i-see Sensor

8
OCH604A
Setting and display items Setting details
Vane · Louver · Vent.
(Lossnay) Use to set the vane angle. 6eOeFt DGesLUeGYDQe settLQJ IUoPGLIIeUeQt settLQJs
Use to turn ON/OFF the louver.
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Use to set the amount of ventilation.
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High power Use to reach the comfortable room temperature quickly.
8QLts FDQ Ee oSeUDteGLQ tKe HLJKSoZeUPoGe IoUXS to 30 PLQXtes
Timer ON/OFF
timer* Use to set the operation ON/OFF times. 7LPe FDQ Ee set LQ PLQXte LQFUePeQts
Auto-Off
timer Use to set the Auto-Off time. 7LPe FDQ Ee set to DYDOXe IUoP30 to 240 LQ 0PLQXte LQFUePeQts
Weekly timer* Use to set the weekly operation ON/OFF times.
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Restriction Temp. range Use to restrict the preset temperature range.
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Operation
lock Use to lock selected functions. 7Ke OoFNeGIXQFtLoQs FDQQot Ee oSeUDteG
Energy
saving Auto return Use to get the units to operate at the preset temperature after performing energy-save RSHUDWLRQIRUDVSHFL¿HGWLPHSHULRG
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7KLs IXQFtLoQZLOO Qot Ee YDOLG ZKeQtKe SUeset tePSeUDtXUe UDQJes DUe UestULFteG
Schedule* Set the start/stop times to operate the units in the energy-save mode for each day of the
week, and set the energy-saving rate.
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7LPe FDQ Ee set LQ PLQXte LQFUePeQts
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Night setback* Use to make Night setback settings.
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tKe stDUtstoStLPes FDQ Ee set
Filter information 8VHWRFKHFNWKH¿OWHUVWDWXV
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Error information Use to check error information when an error occurs.
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Maintenance Manual
vane angle 8VHWRVHWWKHYDQHDQJOHIRUHDFKYDQHWRD¿[HGSRVLWLRQ
3D i-see
Sensor Use to set the following functions for 3D i-see Sensor. ALU GLstULEXtLoQ(QeUJ\ sDYLQJ oStLoQ6eDsoQDO DLUÀoZ
Initial setting Clock Use to set the current time.
Main display Use to switch between "Full" and "Basic" modes for the Main display.
7Ke LQLtLDO settLQJ Ls )XOO
Contrast Use to adjust screen contrast.
Language
selection Use to select the desired language.
Main menu list
CoQtLQXe to tKe Qe[t SDJe


OCH604A
Setting and display items Setting details
Input
maintenance Select "Input maintenance Info." from the Service menu to bring up the Maintenance information screen.
The following settings can be made from the Maintenance Information screen.
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LOSSNAY
setting This setting is required only when the operation of City Multi units is interlocked with LOSSNAY units.
Check Error history: 'LsSOD\ tKe eUUoUKLstoU\ DQG e[eFXte GeOete eUUoUKLstoU\
Self check Error history of each unit can be checked via the remote controller.
Maintenance
password Use to change the maintenance password.
Remote
controller
check
When the remote controller does not work properly, use the remote controller checking
function to troubleshoot the problem.

0
OCH604A
2-2-2. Wired Remote Controller <PAC-YT53CRAU>
.
Backlit LCD
ON/OFF lamp
ON/OFF button
FAN button
VANE button
Note: To set the functions that are not available on this controller (PAC-YT53CRAU) such as Louver,
use the centralized controller.
The lamp will light up in green when
turned on, and blink during startup
and when an error occurs.
Pressing this button starts and
stops the operation.
TEMP. button
MODE button
Note:
The phrase "Wired remote controller" in this manual refers only to the PAC-YT53CRAU.
If you need any information for the other remote controller, please refer to either the installation manual or initial setting manual which are included in
remote controller's box.
GB
Display section
*2 icon
For City Multi, when an error occurs, power indicator will blink, and unit address (3 digits) and check code (4
digits) will blink.
Check the error status, stop the operation, and consult your dealer.
icon appears while the unit is operated in the
energy-save mode
Note: All icons are displayed for explanation purpose
icon appears when Operation lock setting is
effective.
icon appears when indoor unit functions areset up.
(Refer to the Installation Manual.)
Fan speed icon
Vane icon
icon appears when the power is on.
Indoor temperature
Operation modes
CENTRAL icon *1
CHECK icon *2
Preset temperature *3
*1 icon
Appears when one of the following local operations is prohibited: ON/OFF; operation mode; preset temperature;
fan speed; vane.
CENTRAL
*3 Preset temperature
* Centigrade or Fahrenheit is selectable. Refer to the Installation Manual for details.
In COOL, DRYING, HEAT, or
AUTO (single set point) modes In AUTO (dual set point) or SETBACK modes
Room Setto
AUTO COOL HEATFAN
DRYINGVENTI.SETBACK
Preset
temperature
Room Setto
AUTO COOLHEATFAN
DRYINGVENTI.SETBACK
Heatingpreset
temperature
Cooling preset
temperature


OCH604A
2-3. Wireless remote controller
Operation mode
Cool Dr\
Fan Auto
Heat
Temperature setting
The units of temperature can be changed. For
details, refer to the ,nstallation Manual.
Not available
Appears when a non-supported func-
tion is selected.
Battery replacement indicator
Appears when the remaining batter\
power is low.
Vane setting
6tep 6tep 2 6tep 3 6tep 4 6tep 5 6wing Auto
Fan speed setting
6et Temperature buttons
6et Time button (6ets the time)
AirÀow button (Changes up/down airÀow direction)
Mode button (Changes operation mode)
Timer ON button
Timer OFF button
OFF/ON button
Fan 6peed button (Changes fan speed)
6ET/6END button
CANCEL button
Up/Down buttons
Menu button
i-see button
Reset button
Remote controller displa\
Batter\replacement indicator
Transmission area
Not available
:eekl\timer ON/OFF button
(not available)
3D i-see sensor (Air distribution)
Default Direct ,ndirect :hen Direct or ,ndirect
is selected, the vane
setting is set to ³Auto´.

2
OCH604A
3-1. SPECIFICATIONS
3SPECIFICATIONS
6ervice Ref. PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P2NFMU-E.TH PLFY-P5NFMU-E.TH PLFY-P8NFMU-E.TH
power source single phase, 208/230V, 60 Hz
cooling capacit\

k:.4 2.3 3.5 4.3 5.2
 BTU/h 5,000 8,000 2,000 5,000 8,000
Power input k:0.02 0.02 0.02 0.03 0.04
Current input A0. 0.22 0.23 0.28 0.40
Heating capacit\
*3
k:.6 2.6 3.4.5.8
*3 BTU/h 5,600 ,000 3,500 ,000 20,000
Power input k:0.02 0.02 0.02 0.03 0.04
Current input A0.40. 0.8 0.23 0.35
E[ternal ¿nish *alvanized steel sheet
E[ternal dimension
H î:îD
mm 208î50î50
8-3/6î22-/6î22-/6
in
Net weight kg (lb) 3.(28.)3.(28.)4.2(3.3) 4.2(3.3) 4.2(3.3)
Decoration
panel
model 6LP-8FAU
E[ternal ¿nish Munsell .0Y .2/0.2
Dimension
H î:îD
mm 0 î625 î625
3/32î24-/32î24-/32
in
Net weight kg (lb) 2.4(5.3)
Heat e[changer Cross ¿n (Aluminum ¿n and copper tube)
FAN T\pe Turbo fan î
E[ternal static pressure
0 Pa (0 mmH2O)
Motor t\pe DC motor
Motor output k:0.05
Driving mechanism
Direct driven
AirÀow
rate
K/min 6.5-.5-8.0 6.5-8.0-.0 .0-8.0-.5 .5-.0-.0 .0-.0-3.0
L/s 08-25-33 08-33-50 -33-58 25-50-83 50-83-2
cfm 230-265-280 230-280-35 245-280-335 265-35-3035-30-460
Noise level
(Low-Mid-High)
(measured in anechoic room)
dB A!
26-28-30 26-30-33 26-30-34 28-33-333-3-43
,nsulation material P6
Air ¿lter PP hone\comb fabric (long life t\pe)
Protection device Fuse
Refrigerant control device LEV
Connectable outdoor unit R40A C,TY MULT,
Diameter
of
refrigerant
pipe
LiTuid mm (in)
¡6.35 (¡/4) Flare
*as mm (in)
¡2.(¡/2) Flare
Field drain pipe size mm (in)
O.D. 32 mm (-/4) (PVC pipe VP-25 connectable)
6tandard attachment
,nstallation manual, ,nstruction book
Remark Optional parts Decoration panel : 6LP-8FAU, 6LP-8FAEU
*PLFY-P NFMU-E should be used together with decoration panel.
,nstallation Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items
shall be referred to the ,nstallation Manual.
indoor :
Outdoor :
Pipe length :
Level difference :
*Nominal cooling condition
2ÛCDB/ÛC:B (8ÛFDB/66ÛF:B)
35ÛCDB (5ÛFDB)
.5m (24-/6 ft)
0m (0 ft)
*2 Nominal heating condition
20ÛCDB (68ÛFDB)
ÛCDB/6ÛC:B (45ÛFDB/43ÛF:B)
.5 m (24-/6 ft)
0 m (0 ft)
Unit converter
kcal k:î860
BTU/h 3,42
cfm ./min î35.3
lb kg/0.4536
Notes:
. Nominal conditions *and *2 are subMect to -,6 B865-.
2. Due to continuing improvement, above speci¿cation ma\be subMect to change without notice.

3
OCH604A
3-2. ELECTRICAL PARTS SPECIFICATIONS
6ervice ref.
Parts name
6\mbol PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P2NFMU-E.TH PLFY-P5NFMU-E.TH PLFY-P8NFMU-E.TH
Thermistor
(Room temperature
detection)
TH2Resistance 30F/5.8", 50F/.6", 0F/6.0", 80/4.8", 0F/3.", 00F/3.2"
Thermistor
(Pipe temperature
detection/LiTuid)
TH22 Resistance 30F/5.8", 50F/.6", 0F/6.0", 80/4.8", 0F/3.", 00F/3.2"
Thermistor
(Pipe temperature
detection/*as)
TH23 Resistance 30F/5.8", 50F/.6", 0F/6.0", 80/4.8", 0F/3.", 00F/3.2"
Fuse
(,ndoor controller
board)
FU6E 250V 6.3A
Fan motor MF OUTPUT 50 :
Vane motor MV M6BPC20M32 (green label)/M6BPC20M33 (blue label)
DC2V 300"/phase
Drain pump DP PMD-2D3ME
,NPUT 3:(DC 3V) 24R/Hr
Drain Àoat switch F6Open/short detection
Linear e[pansion
valve
>coil@
LEV DC2V 6tepping motor drive, Port dimension [5.2 (0±2000pulse)
EDM-40Y*ME
Power suppl\
terminal block TB2 (L, L2) Rated to 330V 30A*
Transmission
terminal block TB5 (M, M2, 6) Rated to 250V 20A*
MA remote
controller
terminal block
TB5(, 2) Rated to 250V 0A*
* Refer to :,R,N*D,A*RAM for the supplied voltage.

4
OCH604A
Multiple remote
controller adapter
PAC-SA88HA-E
Indoor controller board
Distance between
indoor controller board
and relay must be
within 10m.
Be sure to secure insulation
material by tape, etc.
5Green
Yellow
Orange
Connector (5P)
Indoor unit side
Multiple remote
controller adapter
PAC-SA88HA-E
Be sure to secure insulation
material by tape, etc.
Installation at site
CN51
on
indoor unit
board
Red
Brown
1
~
CN51
MB
+
í
4 4-WAY AIR FLOW SYSTEM
4-1. FRESH AIR INTAKE (Location for installation)
At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when reTuired.
Taking air into the unit
4-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
Q
0
BA
C
1Curve in the
left graphs
Duct characteristics
at site
Q
A
EC
2
Q
Qa
AD
3
How to read curves
NOTE: Fresh air intake amount should be 10% or less of
whole air amount to prevent dew dripping.
:henever the indoor unit operates, the duct fan also
operates.
(1) Connect the optional multiple remote controller
adapter (PAC-SA88HA-E) to the connector CN51
on the indoor controller board.
(2) Drive the relay after connecting the 12 V DC relay
between the Yellow and Orange connector wires.
MB: Electromagnetic switch power relay for duct fan.
;: Au[iliary relay
(For 12 V DC, coil rating: 1.0 :or below)
Static pressure
[Pa(in.W.G.o10-2)]
00.30.6
0.9 1.2 1.5
10
0 20 30 40 50 [CFM]
Airflow rate
[CMM]
í150 (-60)
í120 (-48)
í90 (-36)
í60 (-24)
í30 (-12)
0
4-3. OPERATION IN CONJUNCTION WITH DUCT FAN (Booster fan)
120°
120°
ø 3-15/16
5-1/2
7-5/16
8-3/16
Detail drawing of fresh air intake
Ceiling surface
Refrigerant pipe Drain pipe Electrical Box
Fresh air intake
Cut out hole
Burring hole
1-15/32+3/16
0
PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH PLFY-P18NFMU-E.TH
Q…Designed amount of fresh air intake
CMM (CFM)!
A…Static pressure loss of fresh air intake
duct system with air flow amount Q
Pa (in.:.G.o10-2)!
B…Forced static pressure at air conditioner
inlet with air flow amount Q
Pa (in.:.G.o10-2)!
C…Static pressure of booster fan with air
flow amount Q Pa (in.:.G.o10-2)!
D…Static pressure loss increase amount of
fresh air intake duct system for air flow
amount Q Pa (in.:.G.o10-2)!
E…Static pressure of indoor unit with air
flow amount Q Pa (in.:.G.o10-2)!
Qa…Estimated amount of fresh air intake
without D CMM (CFM)!

15
OCH604A
4-4. FIXING HORIZONTAL VANE
Horizontal vane of each air outlet can be fi[ed according to the environment where it is installed.
Setting procedures
1) Turn off a main power supply (Turn off a breaker).
2) Disconnect the vane motor connector of the direction of the arrow with pressing the unlocking button as shown in figure
below.
Insulate the disconnected connector with the plastic tape.
Vane motor
Horizontal vane
Connector Unlocking button
Vane motor
3) Set the vertical vane of the air outlet by hand slowly within the range in the table below.
A
Measured standard
position of the grille
Horizontal vane
Caution Do not set the dimension out of the range.
Erroneous setting could cause dew drips or malfunction of unit.
.
θ
Set range!
Standard of
horizontal position
Angle ș 21
(Horizontal) Angle ș 24Angle ș 3 Angle ș 42Angle ș 45 (Downward)
Dimension A inch (mm) 1-1/32 (3)1-3/64 (41) 1-2/32(4)1-5/64(48) 1-5/64(4)
Note: Dimension between 1-1/32 (3) and 1-5/64(4) can be arbitrarily set.

16
OCH604A
5OUTLINES AND DIMENSIONS
Unit: inch(mm)
PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH PLFY-P18NFMU-E.TH

1
OCH604A
WIRING DIAGRAM6
PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH PLFY-P18NFMU-E.TH

18
OCH604A
7 REFRIGERANT SYSTEM DIAGRAM
Strainer (#50mesh)
Strainer (#100mesh)
Unit: inch (mm)
Strainer1 (#50mesh)
Strainer2 (#100mesh)
Heat exchanger
Thermistor (Room temperature detection) TH21
Thermistor (Pipe temperature detection/Gas) TH23
Thermistor (Pipe
temperature
detection/Liquid) TH22
Linear expansion valve
Gas pipe
Liquid pipe
Flare connection
Gas pipe
Liquid pipe
[1/2(12.7)
[1/4(6.35)
PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH PLFY-P18NFMU-E.TH

1
OCH604A
8-1. COUNTERMEASURES FOR ERROR DURING TEST RUN
If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the
air conditioning system will automatically cease operating.
Refer to the connected outdoor unit service manual in order to determine the nature of the abnormality and apply corrective
measure.
Check
code Trouble
Detected Unit
Remarks
Indoor Outdoor Remote
Controller
0403 Serial communication error Outdoor unit Multi controller board ~
Power board communication trouble
1102 Compressor temperature Check delay code 1202
1300 Low pressure
1302 High pressure Check delay code 1402
1500 Superheat due to low discharge temperature Check delay code 1600
1501 Refrigerant shortage Check delay code 1601
Closed valve in cooling mode Check delay code 1501
1508 4-way valve trouble in heating mode Check delay code 1608
2500 :ater leakage
2502 Drain over Àow protection
2503 Drain sensor abnormality
4100 Compressor current interruption (locked compressor) Check delay code 4350
4114 Fan motor error
4210 Compressor overcurrent interruption
4220
Undervoltage/overvoltage/PAM error/L1open phase/power synchronization
signal error
Check delay code 4320
4230 Heat Sink temperature Check delay code 4330
4250 Power module Check delay code 4350
4400 Fan trouble Check delay code 4500
5101 Air inlet thermistor (TH21) open/short
Compressor temperature thermistor (TH4) open/short Check delay code 1202
5102 LiTuid pipe temperature thermistor (TH22) open/short
Suction pipe temperature thermistor (TH6) open/short Check delay code 1211
5103 Gas pipe temperature thermistor (TH23) open/short
5105 Outdoor liTuid pipe temperature thermistor (TH3) open/short Check delay code 1205
5106 Ambient thermistor (TH) open/short Check delay code 1221
510HIC pipe temperature thermistor (TH2) open/short Check delay code 1222
5110 Heat Sink temperature thermistor (TH8) open/short Check delay code 1214
5201 High pressure sensor (63HS) Check delay code 1402
5202 Low pressure sensor (63LS) Check delay code 1400
501 Contact failure of drain Àoat switch
6600 Duple[address error Only M-NET Remote controller is detected.
6602 Transmission processor hardware error Only M-NET Remote controller is detected.
6603 Transmission bus BUSY error Only M-NET Remote controller is detected.
6606 Signal communication error with transmission processor Only M-NET Remote controller is detected.
660No AC.error Only M-NET Remote controller is detected. *
6608 No response frame error Only M-NET Remote controller is detected. *
6831 MA communication receive error (no receive signal) Only MA Remote controller is detected.
6832 MA communication send error Only MA Remote controller is detected.
6833 MA communication send error Only MA Remote controller is detected.
6834
MA communication receive error Only MA Remote controller is detected.
100 Total capacity error
101 Capacity code error
102 Connecting e[cessive number of units
105 Address setting error
Note:
:hen the outdoor unit detects No AC.error/No response error, an obMect indoor unit is treated as a stop, and not assumed to be abnormal.
*Abnormality for P:FY series
TROUBLESHOOTING
8

20
OCH604A
8-2. HOW TO CHECK THE PARTS
Parts name Check points
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 10 to 30:)
Disconnect the connector then measure the valve resistance with a tester.
Measure the resistance between the terminals with a tester.
(At the ambient temperature 20 to 30:)
Vane motor (MV)
Linear expansion
valve (LEV)
Refer to “8-2-1. Thermistor Characteristic Graph”.
Thermistor (TH21)
(Room temperature detection)
Thermistor (TH22)
(Pipe tempera ture detection/Liquid)
Thermistor (TH23)
(Pipe temperature detection/Gas)
Normal
4.3 to 9.6 k"
Abnormal
Open or short
AbnormalNormal
White-Red Yellow-Brown Orange-Red Blue-Brown
Orange
Red
White
Blue
Brown
Yellow
M
Orange
Red
White
Blue Yellow
M
Refer to “8-2-2. Linear
Expansion Valve”.
200"i10% Open or short
Drain float switch (FS)
2
1
Moving part
4
3
Measure the resistance between the terminals with a tester.
State of moving part Abnormal
DOWN Other than open
UP Normal
Open
Short Other than short
Switch
Magnet
Moving
Part
i-see sensor *
i-see sensor motor *
Orange
Red
White
Blue Yellow
M
Measure the resistance between the terminals with a tester.
(At the ambient temperature 20 to 30°C)
Drain pump (DP)
1
2
3
Red
Purple
Black
1 Check if the drain float switch works properly.
2 Check if the drain pump works and drains water properly in cooling operation.
3 If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the
operation starts.
Note: The drain pump for this model is driven by the control board and is a DC volt motor, so it is not
possible to measure the resistance between the terminals.
Normal
Red–%ODFN,QSXW9'&ĺThe pump starts to rotate.
Purple–Black: Abnormal (check code 2502) if it outputs 0–13 V square wave (5 pulses/rotation), and
the number of rotation is not normal.
1 2 3 4
1 2 3
4
Black Black Black Black
Turn the power ON while the i-see sensor connector is connected to the CN4Z on indoor
controller board. A communication between the indoor controller board and i-see sensor
board is made to detect the connection.
Normal: When the operation starts, the motor for i-see sensor is driven to rotate the i-see sensor.
Abnormal: The motor for i-see sensor is not driven when the operation starts.
Note: The voltage between the terminals cannot be measured accurately since it is pulse output.
250 "
* i-see sensor is available with optional “i-see sensor corner panel” (SLP-18FAEU).
AbnormalNormal
Red–Yellow Red–Blue Red–Orange Open or short Red–White
300 "
AbnormalNormal
Red–Yellow Red–Blue Red–Orange Open or short Red–White
PLFY-P05NFMU-E.TH PLFY-P08NFMU-E.TH PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH PLFY-P18NFMU-E.TH