Mitsubishi Electric PLA-SM71EA2 User manual

SERVICE MANUAL
INDOOR UNIT
PARTS CATALOG (OCB784)
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
Model name
indication for
MAIN UNIT Model name
indication for GRILLE
Indoor unit
[Model Name] [Service Ref.]
R32/R410A
No. OCH784
October 2021
CONTENTS
1. REFERENCE MANUAL ·······················2
2. SAFETY PRECAUTION ·······················2
3. PARTS NAMES AND FUNCTIONS ········8
4. SPECIFICATIONS ······························9
5. NOISE CRITERION CURVES ············· 11
6. OUTLINES AND DIMENSIONS ··········· 12
7. WIRING DIAGRAM ··························· 13
8. REFRIGERANT SYSTEM DIAGRAM ··· 14
9. TROUBLESHOOTING ······················· 15
10. FUNCTION SETTING ························ 30
11. SPECIAL FUNCTION ························ 31
12. DISASSEMBLY PROCEDURE ············ 35
13. REMOTE CONTROLLER ··················· 42
PLA-SM71EA2
PLA-SM100EA2
PLA-SM125EA2
PLA-SM140EA2
PLA-SM71EA2.UK
PLA-SM100EA2.UK
PLA-SM125EA2.UK
PLA-SM140EA2.UK
Grille model
[Model Name] [Service Ref.]
PLP-6EA
PLP-6EAL
PLP-6EAJ
PLP-6EALM2
PLP-6EA PLP-6EAR1
PLP-6EAL PLP-6EALR1
PLP-6EAJ
PLP-6EALM2

2
OCH784
1REFERENCE MANUAL
OUTDOOR UNIT’S SERVICE MANUAL
SAFETY PRECAUTION
2
MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT
WARNING This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit.
Read the OPERATION MANUAL carefully before operation.
Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation.
Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.
Model Name Service Ref. Service Manual No./Parts Catalog No.
SUZ-SM71VA SUZ-SM71VA.TH OCH706/OCB706
PUZ-SM140VKA
PUZ-SM140YKA
PUZ-SM140VKA.TH
PUZ-SM140YKA.TH OCH708/OCB708
PUZ-SM100/125/140VKA2
PUZ-SM100/125/140YKA2
PUZ-SM100/125/140VKA2.TH
PUZ-SM100/125/140YKA2.TH -
SUZ-SA71VA3
SUZ-SA100VA2
SUZ-SA71VA3.TH
SUZ-SA100VA2.TH TCH030/TCB030
PUHZ-SP125/140VKA
PUHZ-SP100/125/140YKA
PUHZ-SP125/140VKA.TH
PUHZ-SP100/125/140YKA.TH OCH671/OCB671

3
OCH784
Cautions for units utilizing refrigerant R32/R410A
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
Use new refrigerant pipes.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
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.
· In case of reconnecting the refrigerant pipes after
detaching, make the flared part of pipe re-fabricated.
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.
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 R32/R410A refrigerant.
The following tools are necessary to use R32/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 R32/R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, 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.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
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 on name plate of outdoor
unit.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
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.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Preparation before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off
the power-supply breaker.
• Discharge the condenser before the work involving the
electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts
with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be
done without turning off the power, exercise great caution
not to touch the live parts.
• When opening or closing the valve below freezing
temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in
injuries.

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OCH784
[1] Warning for service
(1) Do not alter the unit.
(2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe
components specifically made for use with refrigerant specified in the outdoor unit installation manual.
(3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
(4) This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual.
Refer to outdoor unit installation manual.
(5) Install the indoor unit at least 2.5 m above floor or grade level.
For appliances not accessible to the general public.
(6) Refrigerant pipes connection shall be accessible for maintenance purposes.
(7) If the air conditioner is installed in a small room or closed room, measures must be taken to prevent the refrig-
erant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. Should the
refrigerant leak and cause the concentration limit to be exceeded, hazards due to lack of oxygen in the room may
result.
(8) Keep gas-burning appliances, electric heaters, and other fire sources (ignition sources) away from the location
where installation, repair, and other air conditioner work will be performed.
If refrigerant comes into contact with a flame, poisonous gases will be released.
(9) When installing or relocating, or servicing the air conditioner, use only the specified refrigerant written on out-
door unit to charge the refrigerant lines.
Do not mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and
may result in an explosion and other hazards.
(10) After installation has been completed, check for refrigerant leaks. If refrigerant leaks into the room and comes
into contact with the flame of a heater or portable cooking range, poisonous gases will be released.
(11) Do not use low temperature solder alloy in case of brazing the refrigerant pipes.
(12) When performing brazing work, be sure to ventilate the room sufficiently. Make sure that there are no hazardous
or flammable materials nearby.
When performing the work in a closed room, small room, or similar location, make sure that there are no refriger-
ant leaks before performing the work.
If refrigerant leaks and accumulates, it may ignite or poisonous gases may be released.
(13) Do not install the unit in places where refrigerant may build-up or places with poor ventilation such as a semi-
basement or a sunken place in outdoor: Refrigerant is heavier than air, and inclined to fall away from the leak
source.
(14) Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manu-
facturer.
(15) The appliance shall be stored in a room without continuously operating ignition sources (for example: open
flames, an operating gas appliance or an operating electric heater).
(16) Do not pierce or burn.
(17) Be aware that refrigerants may not contain an odour.
(18) Pipe-work shall be protected from physical damage.
(19) The installation of pipe-work shall be kept to a minimum.
(20) Compliance with national gas regulations shall be observed.
(21) Keep any required ventilation openings clear of obstruction.
(22) Servicing shall be performed only as recommended by the manufacturer.
(23) The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as
specified for operation.
(24) Maintenance, service and repair operations shall be performed by authorized technician with required qualifica-
tion.
[2] 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.
[3] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R32/R410A available on the market is a syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

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OCH784
[4] Cautions for unit using R32 refrigerant
Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful
attention to the following points.
(1) Information on servicing
(1-1) Checks on the Area
Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the
risk of ignition is minimized.
For repair to the refrigerating systems, (1-3) to (1-7) shall be completed prior to conducting work on the systems.
(1-2) Work Procedure
Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor being
present while the work is being performed.
(1-3) General Work Area
All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out.
Work in confined spaces shall be avoided. The area around the workspace shall be sectioned off. Ensure that the con-
ditions within the area have been made safe by control of flammable material.
(1-4) Checking for Presence of Refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is
aware of potentially toxic or flammable atmospheres. Ensure that the leak detection equipment being used is suitable
for use with all applicable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe.
(1-5) Presence of Fire Extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing
equipment shall be available to hand.
Have a dry powder or CO2 fire extinguisher adjacent to the charging area.
(1-6) No Ignition Sources
No person carrying out work in relation to a refrigeration system which involves exposing any pipe work shall use any
sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, includ-
ing cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal,
during which refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area around
the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks. “No Smoking” signs
shall be displayed.
(1-7) Ventilated Area
Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any
hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should
safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
(1-8) Checks on the Refrigeration Equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all
times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt, consult the manufacturer’s
technical department for assistance.
The following checks shall be applied to installations using flammable refrigerants:
• The charge size is in accordance with the room size within which the refrigerant containing parts are installed.
• The ventilation machinery and outlets are operating adequately and are not obstructed.
• Marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be corrected.
• Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance
which may corrode refrigerant containing components, unless the components are constructed of materials which are
inherently resistant to being corroded or are suitably protected against being corroded.
(1-9) Checks on Electrical Devices
Repair and maintenance to electrical components shall include initial safety checks and component inspection proce-
dures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is
satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an ade-
quate temporary solution shall be used. This shall be reported to the owner of the equipment so all parties are advised.
Initial safety checks shall include that:
• capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking;
• no live electrical components and wiring are exposed while charging, recovering or purging the system;
• there is continuity of earth bonding
(2) Repairs to Sealed Components
(2-1) During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked
upon prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment
during servicing, then a permanently operating form of leak detection shall be located at the most critical point to warn
of a potentially hazardous situation.
(2-2) Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not
altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of
connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that the apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of prevent-
ing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the manufacturer’s specifications.

6
OCH784
(3) Repair to intrinsically Safe Components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the
permissible voltage and current permitted for the equipment in use.
Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos-
phere. The test apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer. Other parts may result in the ignition of refrigerant in
the atmosphere from a leak.
(4) Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse
environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such
as compressors or fans.
(5) Detection of Flammable Refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks.
A halide torch (or any other detector using a naked flame) shall not be used.
(6) Leak Detection Methods
Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity
may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.)
Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equip-
ment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed, and the
appropriate percentage of gas (25% maximum) is confirmed.
Leak detection fluids are suitable for use with most refrigerants but the use of detergents containing chlorine shall be
avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work.
If a leak is suspected, all naked flames shall be removed/extinguished.
If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or
isolated (by means of shut off valves) in a part of the system remote from the leak. For appliances containing flammable
refrigerants, oxygen free nitrogen (OFN) shall then be purged through the system both before and during the brazing pro-
cess.
(7) Removal and Evacuation
When breaking into the refrigerant circuit to make repairs – or for any other purpose conventional procedures shall be
used. However, for flammable refrigerants it is important that best practice is followed since flammability is a considera-
tion. The following procedure shall be adhered to:
• remove refrigerant
• purge the circuit with inert gas
• evacuate
• purge again with inert gas
• open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders. For appliances containing flammable refrig-
erants, the system shall be “flushed” with OFN to render the unit safe. This process may need to be repeated several
times.
Compressed air or oxygen shall not be used for purging refrigerant systems.
For appliances containing flammable refrigerants, flushing shall be achieved by breaking the vacuum in the system with
OFN and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to
a vacuum. This process shall be repeated until no refrigerant is within the system. When the final OFN charge is used,
the system shall be vented down to atmospheric pressure to enable work to take place. This operation is absolutely vital
if brazing operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not close to any ignition sources and that ventilation is available.
(8) Charging Procedures
In addition to conventional charging procedures, the following requirements shall be followed:
• Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines
shall be as short as possible to minimize the amount of refrigerant contained in them.
• Cylinders shall be kept upright.
• Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.
• Label the system when charging is complete (if not already).
• Extreme care shall be taken not to overfill the refrigeration system.
Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. The system shall be leak-
tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the
site.
(9) Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its
detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an
oil and refrigerant sample shall be taken in case analysis is required prior to re-use of reclaimed refrigerant. It is essential
that electrical power is available before the task is commenced. Continued to the next page

7
OCH784
a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure, ensure that:
• mechanical handling equipment is available, if required, for handling refrigerant cylinders;
• all personal protective equipment is available and being used correctly;
• the recovery process is supervised at all times by a competent person;
• recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer’s instructions.
h) Do not overfill cylinders. (No more than 80 % volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equip-
ment are removed from site promptly and all isolation valves on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.
(10) Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be
dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stat-
ing the equipment contains flammable refrigerant.
(11) Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice
that all refrigerants are removed safely. When transferring refrigerant into cylinders, ensure that only appropriate refrig-
erant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge
are available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e.
special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure-relief valve and associated
shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery
occurs.
The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at
hand and shall be suitable for the recovery of all appropriate refrigerants including, when applicable, flammable refriger-
ants. In addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be com-
plete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in
satisfactory working order, has been properly maintained and that any associated electrical components are sealed to
prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant
waste transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders. If compressors or
compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that
flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning
the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this pro-
cess. When oil is drained from a system, it shall be carried out safely.
Electronic weighing scale
Unit

98
OCH784
[5] Service tools
Use the below service tools as exclusive tools for R32/R410A refrigerant.
Refer to the spec name plate on outdoor unit for the type of refrigerant being used.
3PARTS NAMES AND FUNCTIONS
Drain pipe
Filter
Vane
Gas pipe
Liquid pipe
Air outlet
Air intake
(Intake grille)
Signal receiver
(Option)
3-1. INDOOR UNIT
No. Tool name Specications
1. Gauge manifold · Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
2. Charge hose · Use pressure performance of 5.09MPa·G or over.
3. Electronic weighing scale ―
4. Gas leak detector · Use the detector for R134a, R407, R410A, or R32.
5. Adaptor for reverse flow check · Attach on vacuum pump.
6. Refrigerant charge base ―
7. Refrigerant cylinder · R32 or R410A refrigerant
· Cylinder with syphon
8. Refrigerant recovery equipment ―
Model name
indication for
MAIN UNIT
Model name
indication for GRILLE
3-2. WIRELESS REMOTE CONTROLLER (Option)
Refer to "13-1. REMOTE CONTROLLER FUNCTIONS" for details.

9
OCH784
SPECIFICATIONS
4
Cooling
0.04
0.27
Heating
0.04
0.25
Single phase, 50Hz, 230 V
Munsell 1.0Y 9.2/0.2
Plate fin coil
Turbo fan (direct) o1
0.05
14-17-19-21
0(direct blow)
–
Remote controller & built-in
28-30-32-34
32(1-1/4)
kW
A
kW
K/min
Pa (mmAq)
kW
dB(A)
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Grille)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium1-High )
External static pressure
Booster heater
Operation control & Thermostat
Noise level SPL (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PLA-SM71EA2.UK
UNIT : 840 (33-3/32) GRILLE: 950 (37-13/32)
UNIT : 840 (33-3/32) GRILLE : 950 (37-13/32)
UNIT : 258 (10-3/16) GRILLE : 40 (1-9/16)
UNIT : 21 GRILLE : 5
Service Ref.
Cooling
0.10
0.66
Heating
0.10
0.64
Single phase, 50Hz, 230 V
Munsell 1.0Y 9.2/0.2
Plate fin coil
Turbo fan (direct) o1
0.120
21-25-28-31
0(direct blow)
–
Remote controller & built-in
33-37-41-44
32(1-1/4)
kW
A
kW
K/min
Pa (mmAq)
kW
dB(A)
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg
W
D
H
INDOOR UNIT
PLA-SM125EA2.UK
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Grille)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium1-H igh)
External static pressure
Booster heater
Operation control & Thermostat
Noise level SPL (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
UNIT : 840 (33-3/32)
UNIT : 840 (33-3/32)
UNIT : 298 (11-3/4)
UNIT : 26 GRILLE : 5
Service Ref.
GRILLE : 950 (37-13/32)
GRILLE : 950 (37-13/32)
GRILLE : 40 (1-9/16)
Cooling
0.07
0.46
Heating
0.07
0.44
Single phase, 50Hz, 230 V
Munsell 1.0Y 9.2/0.2
Plate fin coil
Turbo fan (direct) o1
0.120
19-23-26-29
0(direct blow)
–
Remote controller & built-in
31-34-37-40
32(1-1/4)
kW
A
kW
K/min
Pa (mmAq)
kW
dB(A)
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg
W
D
H
INDOOR UNIT
PLA-SM100EA2.UK
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Grille)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium 1 -High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level SPL (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
UNIT : 840 (33-3/32)
UNIT : 840 (33-3/32)
UNIT : 298 (11-3/4)
UNIT : 24 GRILLE : 5
Service Ref.
GRILLE: 950 (37-13/32)
GRILLE : 950 (37-13/32)
GRILLE : 40 (1-9/16)

1110
OCH784
kW
A
kW
K/min
Pa (mmAq)
kW
dB(A)
mm (inch)
mm (inch)
mm (inch)
mm (inch)
kg
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Grille)
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Airflow (Low-Medium2- Medium1-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level SPL (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PLA-SM140EA2.UK
Cooling
0.10
0.66
Heating
0.10
0.64
Single phase, 50Hz, 230 V
Munsell 1.0Y 9.2/0.2
Plate fin coil
Turbo fan (direct) o1
0.120
24-26-29-32
0(direct blow)
–
Remote controller & built-in
36-39-42-44
32(1-1/4)
UNIT : 840 (33-3/32)
UNIT : 840 (33-3/32)
UNIT : 298 (11-3/4)
UNIT : 26 GRILLE : 5
Service Ref.
GRILLE : 950 (37-13/32)
GRILLE : 950 (37-13/32)
GRILLE : 40 (1-9/16)

11
OCH784
5NOISE CRITERION CURVES
4000 8000
PLA-SM71EA2.UK
NOTCH SPL(dB) LINE
High 34
Medium1 32
Medium2 30
Low 28
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
PLA-SM100EA2.UK NOTCH SPL(dB) LINE
High 40
Medium1 37
Medium2 34
Low 31
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
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
BAND CENTER FREQUENCIES, Hz
PLA-SM140EA2.UK NOTCH SPL(dB) LINE
High 44
Medium1 42
Medium2 39
Low 36
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 (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
NOTCH SPL(dB) LINE
High 44
Medium1 41
Medium2 37
Low 33
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
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
BAND CENTER FREQUENCIES, Hz
PLA-SM125EA2.UK
MAIN UNIT
1.5 m
MICROPHONE
CEILING

12 13
OCH784
6OUTLINES AND DIMENSIONS
Unit: mm

13
OCH784
WIRING DIAGRAM
7
1
3
5
CN01
(BK)
CN3C
(BU)
1
3
BK
BU
GY
BU
RD
SYMBOL SYMBOLNAME NAME
I.B
DP
FS
MF
MV
INDOOR CONTROLLER BOARD
CONNECTOR (LOSSNAY)
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
CONNECTOR (IT TERMINAL)
FUSE (T6.3AL250V)
POWER SUPPLY (I.B)
POWER SUPPLY (R.B)
TRANSMISSION (INDOOR-OUTDOOR)
SWITCH (MODEL SELECTION) Refer to <Table 1>.
SWITCH (CAPACITY CODE) Refer to <Table 2>.
SWITCH (EMERGENCY OPERATION)
DRAIN PUMP
DRAIN FLOAT SWITCH
FAN MOTOR
VANE MOTOR
TERMINAL BLOCK (INDOOR/OUTDOOR
CONNECTING LINE)
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)
ROOM TEMP. THERMISTOR
(0°C / 15kΩ, 25°C / 5. 4kΩ DETECT)
PIPE TEMP. THERMISTOR/LIQUID
(0°C / 15kΩ, 25°C / 5. 4kΩ DETECT)
COND. / EVA. TEMP. THERMISTOR
(0°C / 15kΩ, 25°C / 5. 4kΩ DETECT)
WIRED REMOTE CONTROLLER
PCB OF SIGNAL RECEIVER
BUZZER
LED (OPERATION INDICATION : GREEN)
LED (PREPARATION FOR HEATING : ORANGE)
RECEIVING UNIT
EMERGENCY OPERATION (HEAT / DOWN)
EMERGENCY OPERATION (COOL / UP)
TERMINAL BLOCK (INDOOR UNIT POWER
AND TRANSMISSION LINE)
TB4
TB5,TB6
TH1
TH2
TH5
R.B
OPTION PART
CN2L
CN32
CN41
CN51
CN105
F1
LED1
LED2
LED3
SW1
SW2
SWE
[LEGEND]
[Self-diagnosis]
1. For details on how to operate self-diagnosis with the wireless remote controller,refer to the technical manuals etc.
W.B
TB2
BZ
LED1
LED2
RU
SW1
SW2
Check code
Symptom
P1
P2
P4
P5
P6
P8
P9
PA
Abnormality of room temperature thermistor (TH1).
Abnormality of pipe temperature thermistor / Liquid (TH2).
Float switch connector open (FS).
Malfunction of Drain pump.
Freezing / overheating protection is working.
Abnormality of pipe temperature.
Abnormality of pipe temperature
thermistor / Cond. /Eva. (TH5).
Leakage error (refrigerant system)
Check code
Symptom
PB(Pb)
PL
E0~E5
E6~EF
FB(Fb)
U*, F*
Indoor unit fan motor error.
Refrigerant circuit abnormal.
Abnormality of the signal transmission between
remote controller and indoor unit.
Abnormality of the signal transmission between
indoor unit and outdoor unit.
Abnormality of indoor controller board.
Abnormality in outdoor unit. Refer to outdoor
unit wiring diagram.
1. Symbols used in wiring diagram on the left are, :Terminal (block),
, :Connector.
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.
● If the separate indoor/outdoor unit power supplied system is
applied, refer to Fig. 2.
● For power supply system of this unit, refer to the caution label
located near this diagram.
15 10
12
Do not connect 230V power supply cable.
Cable strap
Be sure to connect the remote
controller cable (0.3mm2) to the
locations shown in diagram
Secure with a
band at the location
shown in the diagram
<Table 2> SW2 (CAPACITY CODE)
Manufacture/Service
ON
OFF
12345 6
CAPACITY
Manufacture/Service
71 ON
OFF
12345
125 ON
OFF
12345
100 ON
OFF
12345
CAPACITY
Manufacture/Service
140 ON
OFF
12345
<Table 1> SW1 (MODEL SELECTION)
The black square ( ) indicates
a switch position.
<Fig. 1>
Notes:
Caution when connecting the remote controller cable to the terminal block TB5
YE
OG
OG
BN
1
202
1 19
3
CNV
(WH)
CN32 (WH)
J41 J42
SW2 SW1
Refer to Table 1 and 2
LED2
TB4
LED1
F1
CN3C (BU)
+–
TB2
N
L
S2
S3
S1
S2
S3
13
5
3
1
CN01
(BK)
J52J57J58
2
41
ON OFF
SWE
CN20
(RD)
CN90 (WH)
CN4F
(WH)
CN44
(WH)
LED3
tºtº tº
FS
TH2
TH5 TH1
TB5
R.B
I.B
1 5
CN105
(RD)
14
4
1
41
12 1 3
74
1
DP
3~
MF
CNP
(WH)
MS
2
1
TB6
B
A
3~
MS
CN4G
● AUTOMATIC FILTER
ELEVATION PANEL
CN4G
(BU)
9
1
CNMF
(WH)
4
TO
OUTDOOR
UNIT
TO OUTDOOR
UNIT
POWER SUPPLY
~(1 PHASE)
230V 50Hz
<Fig. 2>
BK
1 2
CN2L
(RD)
41
CN41
(WH)
5 1
CN51
(WH)
~
~
20
5555
MVMVMVMV
MMMM
1
W.B
RU
LED2 LED1
SW2
SW1
CNB
9
9BZ
SIGNAL RECEIVER
CORNER PANEL
(OPTION PART)
Cut the J58 when a remote
controller other than
PAR-4*MAA/CT01MAA
is connected.

14 15
OCH784
Thermistor TH2
(Pipe temperature/liquid)
Distributor
with strainer (#50)
Thermistor TH5
(Cond./eva. temperature)
Thermistor TH1
(Room temperature)
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

15
OCH784
<Check code displayed 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 .
TROUBLESHOOTING
9
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
Refer to "13-8. SELF-DIAGNOSIS" to search for the error history.

16
OCH784
OPERATION
INDICATOR
lamp blinking
pattern
Beep Beep Beep Beep Beep Beep Beep
O󰀨
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
O󰀨
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
Number of blinks/beeps in pattern indicates
the check code in the following table
nth 1st 2nd 3rd 1st 2nd
Self-check
starts
(Start signal
received)
Beeper sounds
[Output pattern B]
[Output pattern A]
OPERATION
INDICATOR
lamp blinking
pattern
Beep Beep Beep Beep Beep Beep Beep
O󰀨
Approx. 2.5 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
O󰀨
Approx. 2.5 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
Number of blinks/beeps in pattern indicates
the check code in the following table
nth
1st 2nd 3rd 1st 2nd
Self-check
starts
(Start signal
received)
Beeper sounds
Refer to the following tables for details on the check codes.
[Output pattern A] Errors detected by indoor unit
Wireless remote controller Wired remote
controller
Symptom Remark
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1 P1 Intake sensor error
2P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
3 E6, E7 Indoor/outdoor unit communication error
4 P4 Drain sensor error / Float switch connector open
5P5 Drain overow protection operation
PA Forced compressor error (due to water leakage abnormality)
6 P6 Freeze (during cooling operation)/Overheat protection operation (during heating
operation)
7 EE Combination error between indoor and outdoor unit
8 P8 Pipe temperature error
9 E4, E5 Communication error between wired remote controller and indoor unit
10 — —
11 Pb Indoor unit fan motor error
12 Fb Indoor unit control system error (memory error, etc.)
14 PL Refrigerant circuit abnormal
— E0,E3 Remote controller transmission error
— E1,E2 Remote controller control board error
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Note: The supported check codes may vary depending on the connected outdoor unit.
Wireless remote controller Wired remote
controller
Symptom Remark
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1E9 Indoor/outdoor unit communication error
For details, check the LED
display of the outdoor
controller board.
2UP Compressor overcurrent interruption
3U3, U4 Open/short of outdoor unit thermistors
4UF Compressor overcurrent interruption (When compressor locked)
5U2 Abnormal high discharging temperature/49C worked/insu󰀩cient refrigerant
6U1, Ud Abnormal high pressure (63H worked)/Overheat protection operation
7U5 Abnormal temperature of heat sink
8U8 Outdoor unit fan protection stop
9U6 Compressor overcurrent interruption/Abnormal of power module
10 U7 Abnormality of super heat due to low discharge temperature
11 U9, UH Abnormality such as overvoltage or voltage shortage and abnormal synchro-
nous signal to main circuit/Current sensor error
12 — —
13 — —
14 Others Other errors (Refer to the technical manual for the outdoor unit.)
Notes:
1. If the beeper does not sound again after the initial 2 beeps to conrm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on, there are no error records.
2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 seconds)” after the initial 2 beeps to conrm
the self-check start signal was received, the specied refrigerant address is incorrect.
• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• On wired remote controller
Check code displayed in the LCD.

17
OCH784
[Output pattern A] Errors detected by indoor unit
Wireless remote controller Wired remote
controller
Symptom Remark
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1 P1 Intake sensor error
2P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
3 E6, E7 Indoor/outdoor unit communication error
4 P4 Drain sensor error / Float switch connector open
5P5 Drain overow protection operation
PA Forced compressor error (due to water leakage abnormality)
6 P6 Freeze (during cooling operation)/Overheat protection operation (during heating
operation)
7 EE Combination error between indoor and outdoor unit
8 P8 Pipe temperature error
9 E4, E5 Communication error between wired remote controller and indoor unit
10 — —
11 Pb Indoor unit fan motor error
12 Fb Indoor unit control system error (memory error, etc.)
14 PL Refrigerant circuit abnormal
— E0,E3 Remote controller transmission error
— E1,E2 Remote controller control board error
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Note: The supported check codes may vary depending on the connected outdoor unit.
Wireless remote controller Wired remote
controller
Symptom Remark
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
Check code
1E9 Indoor/outdoor unit communication error
For details, check the LED
display of the outdoor
controller board.
2UP Compressor overcurrent interruption
3U3, U4 Open/short of outdoor unit thermistors
4UF Compressor overcurrent interruption (When compressor locked)
5U2 Abnormal high discharging temperature/49C worked/insu󰀩cient refrigerant
6U1, Ud Abnormal high pressure (63H worked)/Overheat protection operation
7U5 Abnormal temperature of heat sink
8U8 Outdoor unit fan protection stop
9U6 Compressor overcurrent interruption/Abnormal of power module
10 U7 Abnormality of super heat due to low discharge temperature
11 U9, UH Abnormality such as overvoltage or voltage shortage and abnormal synchro-
nous signal to main circuit/Current sensor error
12 — —
13 — —
14 Others Other errors (Refer to the technical manual for the outdoor unit.)
Notes:
1. If the beeper does not sound again after the initial 2 beeps to conrm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on, there are no error records.
2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 seconds)” after the initial 2 beeps to conrm
the self-check start signal was received, the specied refrigerant address is incorrect.
• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• On wired remote controller
Check code displayed in the LCD.
•If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.
Symptom Cause
Wired remote controller
On the wireless remote controller with condition above, following phenomena take place.
• No signals from the remote controller can be received.
• Operation lamp is blinking.
• The buzzer makes a short ping sound.
Please Wait
Please Wait →check code
No messages appear even
when operation switch is turned
ON (operation lamp does not
light up).
For about 2 minutes after power-on
Subsequent to about 2 minutes
after power-on
•
For about 2 minutes after power-on, operation of the
remote controller is not possible due to system startup.
(Correct operation)
•Connector for the outdoor unit’s protection device is not
connected.
•Reverse or open phase wiring for the outdoor unit’s
power terminal block
•Incorrect wiring between indoor and outdoor units.
(incorrect polarity of S1, S2, S3)
•Remote controller wire short
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
LED1 (power for microprocessor) Indicates whether control power is supplied. Make sure that this LED is
always lit.
LED2 (power for remote controller) Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant address “0”.
LED3 (communication between indoor and
outdoor units)
Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.

18
OCH784
9-3. SELF-DIAGNOSIS ACTION TABLE
Note: Errors to be detected in outdoor unit, such as codes starting with
F, U or E (excluding E0 to E7), are not covered in this document.
Please refer to the outdoor unit's service manual for the details.
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
while measuring resistance value of thermistor,
breaking of wire or contact failure can be
detected.
2Check contact failure of connector (CN20)
on the indoor controller board. Refer to "9-7.
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).
2Check contact failure of connector (CN44)
on the indoor controller board. Refer to "9-7.
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.
P4
Contact failure of drain float switch
(CN4F)
• Extract when the connector of drain float
switch is disconnected.
(3and 4of connector CN4F is not
short-circuited.)
• Constantly detected during operation
1Contact failure of connector
(Insert failure)
2Defective indoor controller
board
1
Check contact failure of float switch connector.
Turn the power on again and check after
inserting connector again.
2Operate with connector (CN4F) short-
circuited.
Replace indoor controller board if abnormality
reappears.
P5
Drain overflow protection operation
1Suspensive abnormality, if drain float
switch is detected to be underwater for
1 minute and 30 seconds continuously
with drain pump on.
Compressor and indoor fan will be
turned off.
2Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.
3Constantly detected during drain pump
operation
1Malfunction of drain pump
2Defective drain
Clogged drain pump
Clogged drain pipe
3Defective drain float switch
Jamming of the drain float
switch or malfunction of moving
parts causing the drain float
switch to be detected under
water (Switch On)
4Defective indoor-controller
board
1Check if drain pump works.
2Check drain function.
3Remove drain float switch connector CN4F
and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN with
the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.
4Replace indoor controller board if it is short-
circuited between 3–4of the drain float
switch connector CN4F and abnormality
reappears.
It is not abnormal if there is no problem about
the above-mentioned 1–4.
Turn the power off, and on again to operate
after check.

19
OCH784
Check code
Abnormal point and detection method Cause Countermeasure
P6
Freeze/overheat protection is operating
1Freeze protection (Cooling mode)
The unit is in 6-minute resume preven-
tion 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 pre-
vention mode.
2Overheat protection (Heating mode)
The unit is in 6-minute resume prevention
mode if pipe <liquid or 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.
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.
(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 defec-
tive.
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 defec-
tive.
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 "9-6. 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 "9-6. HOW TO CHECK THE
PARTS".
5Check outdoor fan motor.
6–8Check operating condition of refrigerant
circuit.
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe tem-
perature is not in the cooling range 3 min-
utes 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 heat-
ing 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/evapo-
rator> temperature with room tempera-
ture display on remote controller and
outdoor controller circuit board.
Pipe <liquid or condenser/evaporator>
temperature display is indicated by set-
ting SW2 of outdoor controller circuit
board as follows.
23 Check 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)’.
()
Drain pump lock protection operation
1Malfunction of drain pump
2Clogged drain pump
3Contact failure of connector
4Defective indoor controller
board
1Check if drain pump works.
2Check if drain pump works.
3Check contact failure of connector CNP
4Press the indoor emergency switch (SWE)
to check the voltage between CNP1-3.
• If
13 V DC, replace the drain pump.
• If not 13 V DC, replace the indoor controller
board.
P5
1Error postponement, if drain pump stops
for 5 seconds continuously while drain
pump is operating.
2Drain pump is abnormal if above condi-
tion is repeated 4 times after error post-
ponement is detected.

20
OCH784
Check code
Abnormal point and detection method Cause Countermeasure
P9
Pipe temperature thermistor/
Condenser-Evaporator (TH5)
1The unit is in 3-minute resume protec-
tion 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 "9-7. 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 <con-
denser/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.
E0
or
E4
Remote controller transmission
error(E0)/signal receiving error(E4)
1Abnormal if main or sub remote con-
troller 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.
• The number of connecting indoor units:
max. 16 units
• The number of connecting remote control-
ler: max. 2 units
• Total wiring length:
When one remote controller is connected:
max. 500 m
When two remote controllers are connect-
ed: 200m
(Do not use a multicore cable.)
If the cause of trouble is not any of 1–3above,
4Diagnose remote controllers.
a) When “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 “NG” is displayed,
Replace remote controller.
c) When “E3” or “ERC” 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 abnor-
mal.
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 sec-
onds 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 trans-
mitted data at the same time and com-
pares 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 “OK” is displayed, remote control-
lers have no problem.
Turn the power off,and on again to check.
When becoming abnormal again, replace
indoor controller board.
b) When “NG” is displayed, replace remote
controller.
c) When “E3” or “ERC” 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 con-
trollers)
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 trans-
mission wire of remote control-
ler.
In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service
tool (PAC-SK52ST).
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