INVENTOR O3MVI32-09WiFiR, O3MVO32-09O3MVI32-12WiFiR, O3MVO32-24, O3MVO32-12O3MVI32-18WiFiR, O3MVO32-18O3MVI32-24WiFiR Service Manual

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• SERVICE MANUAL

ENGLISH

WALL MOUNTED UNIT

AIR CONDITIONING SYSTEMS

MODELS:

O3MVI32-09WiFiR/O3MVO32-09 O3MVI32-12WiFiR/O3MVO32-12 O3MVI32-18WiFiR/O3MVO32-18 O3MVI32-24WiFiR/O3MVO32-24

Table of Contents

Page

1. Safety Precautions ........................................................................................ 1

1. Precautions

2. Information servicing

2. Specifications ................................................................................................ 7

1. Model Reference

2. Electrical Wiring Diagrams

3. Product Features ........................................................................................... 13

1. Operation Modes and Functions

4. Maintenance and Disassembly .................................................................... 20

1. Maintenance

2. Disassembly

5. Troubleshooting ............................................................................................ 59

1. Safety Caution

2. General Troubleshooting

3. Error Diagnosis and Troubleshooting Without Error Code

4. Quick Maintenance by Error Code

5. Troubleshooting by Error Code

Appendix ............................................................................................................. 86

i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K)

ii) Temperature Sensor Resistance Value Table for TP (°C – K)

iii) Pressure On Service Port

Caution: Risk of fire/flammable material

Contents

1. Precautions .............................................................................................................2

2. Information servicing ............................................................................................3

Safety Precautions

Safety

Precautions

 Page 2 

1. Precautions

To prevent personal injury, or property or unit damage, adhere to all precautionary measures and instructions outlined in this manual. Before servicing a unit, refer to this service manual and its relevant sections.

Failure to adhere to all precautionary measures listed in this section may result in personal injury, damage to the unit or to property, or in extreme cases, death.

WARNING indicates a potentially hazardous situation which if not avoided could result in serious personal injury, or death.

CAUTION indicates a potentially hazardous situation which if not avoided could result in minor or moderate personal injury, or unit damage.

1.1 In case of Accidents or Emergency

WARNING

•• If a gas leak is suspected, immediately turn off the gas and ventilate the area if a gas leak is suspected before turning the unit on.

•• If strange sounds or smoke is detected from the unit, turn the breaker off and disconnect the power supply cable.

•• If the unit comes into contact with liquid, contact an authorized service center.

•• If liquid from the batteries makes contact with skin or clothing, immediately rinse or wash the area well with clean water.

•• Do not insert hands or other objects into the air inlet or outlet while the unit is plugged in.

•• Do not operate the unit with wet hands.

•• Do not use a remote controller that has previously

been exposed to battery damage or battery leakage.

CAUTION

•• Clean and ventilate the unit at regular intervals when operating it near a stove or near similar devices.

•• Do not use the unit during severe weather conditions. If possible, remove the product from the window before such occurrences.

1.2 Pre-Installation and Installation

WARNING

•• Use this unit only on a dedicated circuit.

•• Damage to the installation area could cause the unit

to fall, potentially resulting in personal injury, property damage, or product failure.

•• Only qualified personnel should disassemble, install, remove, or repair the unit.

•• Only a qualified electrician should perform electri- cal work. For more information, contact your dealer, seller, or an authorized service center.

CAUTION

•• While unpacking be careful of sharp edges around the unit as well as the edges of the fins on the condenser and evaporator.

1.3 Operation and Maintenance

WARNING

•• Do not use defective or under-rated circuit breakers.

•• Ensure the unit is properly grounded and that a

dedicated circuit and breaker are installed.

•• Do not modify or extend the power cable. Ensure the power cable is secure and not damaged during operation.

•• Do not unplug the power supply plug during operation.

•• Do not store or use flammable materials near the unit.

•• Do not open the inlet grill of the unit during operation.

•• Do not touch the electrostatic filter if the unit is equipped with one.

•• Do not block the inlet or outlet of air flow to the unit.

•• Do not use harsh detergents, solvents, or similar items

to clean the unit. Use a soft cloth for cleaning.

•• Do not touch the metal parts of the unit when removing the air filter as they are very sharp.

•• Do not step on or place anything on the unit or outdoor units.

•• Do not drink water drained from the unit

•• Avoid direct skin contact with water drained from the

unit.

•• Use a firm stool or step ladder according to manufacturer procedures when cleaning or maintaining the unit.

CAUTION

•• Do not install or operate the unit for an extended period of time in areas of high humidity or in an environment directly exposing it to sea wind or salt spray.

•• Do not install the unit on a defective or damaged installation stand, or in an unsecure location.

•• Ensure the unit is installed at a level position

•• Do not install the unit where noise or air discharge

created by the outdoor unit will negatively impact the environment or nearby residences.

•• Do not expose skin directly to the air discharged by the unit for prolonged periods of time.

•• Ensure the unit operates in areas water or other liquids.

•• Ensure the drain hose is installed correctly to ensure proper water drainage.

•• When lifting or transporting the unit, it is recommended that two or more people are used for this task.

•• When the unit is not to be used for an extended time, disconnect the power supply or turn off the breaker.

Safety

Precautions

 Page 3 

2. Information servicing

2.1 Checks to 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 system, the following precautions shall be complied with prior to conducting work

on the system.

2.2 Work procedure

• Work shall be undertaken under a controlled procedure so as to minimise the risk of a ﬂammable gas or vapour being

present while the work is being performed.

2.3 Work procedure

• 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 work space shall be sectioned off. Ensure that the conditions within the area have been made

safe by control of ﬂammable material.

2.4 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 ﬂammable atmospheres.

• Ensure that the leak detection equipment being used is suitable for use with ﬂammable refrigerants, i.e. no sparking,

adequately sealed or intrinsically safe.

2.5 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.

2.6 No ignition sources

• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained ﬂammable refrigerant 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, including cigarette smoking, should be kept sufﬁciently far away from the site of installation, repairing, removing and disposal, during which ﬂammable 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.

2.7 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.

2.8 Checks to 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;

• if an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant; 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 so corroded.

2.9 Checks to electrical devices

• Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. 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 adequate 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:

Safety

Precautions

 Page 4 

• that capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking;

• that there no live electrical components and wiring are exposed while charging, recovering or purging the system;

• that there is continuity of earth bonding.

2.10 Repairs to sealed components

• 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.

• 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 apparatus is mounted securely.

• Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of ﬂammable atmospheres. Replacement parts shall be in accordance with the manufacturer’s speciﬁcations.

NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment. Intrinsically safe components do not have to be isolated prior to working on them.

2.11 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 atmosphere. 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.

2.12 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.

2.13 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.

2.14 Leak detection methods

• The following leak detection methods are deemed acceptable for systems containing ﬂammable refrigerants. Electronic leak detectors shall be used to detect ﬂammable refrigerants, but 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 equipment 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 or 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 systemremote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the system both before and during the brazing process.

2.15 Removal and evacuation

• When breaking into the refrigerant circuit to make repairs or for any other purpose, conventional procedures shall be used. However, it is important that best practice is followed since ﬂammability is a consideration.

• 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.

Safety

Precautions

 Page 5 

• The refrigerant charge shall be recovered into the correct recovery cylinders. 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 this task. 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 there is ventilation available.

2.16 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 OFN. 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.

2.17 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.

• Become familiar with the equipment and its operation.

• Isolate system electrically.

• 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.

• Pump down refrigerant system, if possible.

• If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.

• Make sure that cylinder is situated on the scales before recovery takes place.

• Start the recovery machine and operate in accordance with manufacturer’s instructions.

• Do not overﬁll cylinders. (No more than 80 % volume liquid charge).

• Do not exceed the maximum working pressure of the cylinder, even temporarily.

• When the cylinders have been ﬁlled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off.

• Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.

2.18 Labelling

• Equipment shall be labelled stating that it has been decommissioned and emptied of

• refrigerant. The label shall be dated and signed. Ensure that there are labels on the equipment stating the equipment contains ﬂammable refrigerant.

2.19 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 refrigerant recovery cylinders are employed. Ensure that the correct numbers 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.

Safety

Precautions

 Page 6 

• 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 ﬂammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order.

• Hoses shall be complete 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 process. When oil is drained from a system, it shall be carried out safely.

Contents

1. Model Reference ....................................................................................................8

2. Electrical Wiring Diagrams ....................................................................................9

2.1 Indoor Unit ....................................................................................................9

2.2 Outdoor Unit ...............................................................................................11

Specifications

Speciﬁcations

 Page 8 

1. Model Reference

Refer to the following table to determine the speciﬁc indoor and outdoor unit model number of your purchased equipment.

Indoor Unit Model Outdoor Unit Model Capacity (Btu) Power Supply

O3MVI32-09WiFiR O3MVO32-09

220-240V~, 50Hz,

1Phase

O3MVI32-12WiFiR O3MVO32-12

12k

O3MVI32-24WiFiR O3MVO32-18

18k

O3MVI32-24WiFiR O3MVO32-24

24k

Speciﬁcations

 Page 9 

2. Electrical Wiring Diagrams

2.1 Indoor unit

Abbreviation Paraphrase

Y/G Yellow-Green Conductor

ION Positive and Negative Ion Generator

CAP Capacitor

PLASMA Electronic Dust Collector

L LIVE

N NEUTRAL

Heater The Electric Heating Belt of Indoor Unit

T1 Indoor Room Temperature

T2 Coil Temperature of Indoor Heat Exchanger Middle

Speciﬁcations

 Page 10 

O3MVI32-09WiFiR, O3MVI32-12WiFiR, O3MVI32-18WiFiR, O3MVI32-24WiFiR

INDOOR WIRING DIAGRAM

16022000020169

HEATER

OPTIONAL

Applicalbe for MONO unit with 1W standby control feature

Applicable for MULTI and MONO unit without 1W standby control feature

X Y E 12V/5V

HA HB

To CCM Comm.Bus or 485 Wire-controller

To Randomly Connected Wire-controller

To Remote Switch

To Remote Alarm

- - - - This symbol indicates the element is optional,the actual shape shall prevail.

5(3or2)

ION

OPTIONAL

Y/G

Applicable to AC motor only

OPTIONAL

CAP

OPTIONAL

CN701

SWITCH BOARD

Speciﬁcations

 Page 11 

2.2 Outdoor Unit

Abbreviation Paraphrase

4-WAY Gas Valve Assembly/4-WAY VALVE

AC-FAN Alternating Current FAN

DC-FAN Direct Current FAN

CT1 AC Current Detector

COMP Compressor

L-PRO Low Pressure Switch

H-PRO High Pressure Switch

EEV Electronic Expansion Valve

O3MVO32-09, O3MVO32-12, O3MVO32-18

4-WAY

OPTIONAL: DC-FAN

CN 7

AC-FAN

CAPACITOR

PAN HEATER

CRANKCASE HEAT ER

BROWN

I NDOOR UNI T

2(N)

BLUE OR BLACK

1(L)

Y/G

AMBIENT TEMP. SENSOR

Y/G

BLUE

RED

BLACK

Y/G

Speciﬁcations

 Page 12 

O3MVO32-24

BLAC

K(BLUE

)

OPTIONAL:

HEATER 2

CN4

OWN

BLUE

16022000019069

（）YELLOW

Applicable to the units adopting DC motor only

Applicable to the units adopting AC motor only

CN3

CN30

TO I NDOOR UNI T

POWER SUPPL Y

Y/G

PTI

NAL

Contents

1. Operation Modes and Functions ........................................................................14

1.1 Abbreviation ................................................................................................14

1.2 Safety Features ............................................................................................14

1.3 Display Function ..........................................................................................14

1.4 Fan Mode ....................................................................................................15

1.5 Cooling Mode .............................................................................................15

1.6 Heating Mode .............................................................................................15

1.7 Auto-mode ..................................................................................................16

1.8 Drying Mode ...............................................................................................16

1.9 Forced Operation Function ..........................................................................16

1.10 Sleep Function .............................................................................................16

1.11 Auto-Restart Function ..................................................................................16

1.12 Refrigerant Leakage Detection .....................................................................17

1.13 8°C Heating(Optional) ................................................................................17

1.14 Self Clean(Optional) ....................................................................................17

1.15 Follow Me(Optional) ...................................................................................17

1.16 Silence（Optional) .......................................................................................17

1.17 Information Inquiry ......................................................................................17

Product Features

 Page 14 

1. Operation Modes and Functions

1.1 Abbreviation

Unit element abbreviations

Abbreviation Element

T1 Indoor room temperature

T2 Coil temperature of evaporator

T3 Coil temperature of condenser

T4 Outdoor ambient temperature

TS Set temperature

TP Compressor discharge temperature

1.2 Safety Features

Compressor three-minute delay at restart

Compressor functions are delayed for up to one minute upon the ﬁrst startup of the unit, and are delayed for up to three minutes upon subsequent unit restarts.

Zero crossing detection error protection

If AC can not detect zero crossing signal for 4 minutes or the zero crossing signal time interval is not correct, the unit will stop and the LED will display the failure. The correct zero crossing signal time interval should be between 6-13ms.

Automatic shutoff based on discharge temperature

If the compressor discharge temperature exceeds 108°C for a period of time, the compressor ceases operation.

Automatic shutoff based on fan speed

If the indoor fan speed registers below 300RPM for an extended period of time, the unit ceases operation and the corresponding error code is displayed on the indoor unit.

Inverter module protection

The inverter module has an automatic shutoff mechanism based on the unit’s current, voltage, and temperature. If automatic shutoff is initiated, the corresponding error code is displayed on the indoor unit and the unit ceases operation.

Indoor fan delayed operation

• When the unit starts, the louver is automatically activated and the indoor fan will operate after a period of 7 seconds.

• If the unit is in heating mode, the indoor fan is regulated by the anti-cold wind function.

Compressor preheating

Preheating is automatically activated when T4 sensor is lower than 3°C.

Sensor redundancy and automatic shutoff

• If one temperature sensor malfunctions, the air conditioner continues operation and displays the corresponding error code, allowing for emergency use.

• When more than one temperature sensor is malfunctioning, the air conditioner ceases operation.

Refrigerant leakage detection

This function is active only when cooling mode is selected. It will detect if the compressor is being damaged by refrigerant leakage or by compressor overload. This is measured using the coil temperature of evaporator T2 when the compressor is in operation.

1.3 Display Function

Unit display functions

Function Display

Temperature Set temperature value

Temperature (fan and Drying mode)

Room temperature

Activation of Timer ON, Fresh, Swing, Turbo, or Silent

(3s)

Cancellation of Timer OFF, Fresh, Swing, Turbo, or Silent

(3s)

Defrost

Warming in heating mode

Self-clean (available on select units only)

Heating in room temperature under 8°C

Product Features

 Page 15 

1.4 Fan Mode

When fan mode is activated:

• The outdoor fan and compressor are stopped.

• Temperature control is disabled and no temperature setting is displayed.

• The indoor fan speed can be set to high, medium, low, or auto.

• The louver operations are identical to those in cooling mode.

• Auto fan: In fan-only mode, AC operates the same as auto fan in cooling mode with the temperature set at

24°C.

1.5 Cooling Mode

1.5.1 Compressor Control

∆T means the temperature compensation.

• When T1-Ts < ∆T- 2 ℃, the compressor ceases operation.

• When T1-Ts > ∆T+3℃, the compressor continues operation.

• When the AC is operating in mute mode, the compressor operates at a low frequency.

• When the current exceeds the preset value, the current protection function activates and the compressor ceases operation.

1.5.2 Indoor Fan Control

• In cooling mode, the indoor fan operates continuously. The fan speed can be set to high, medium, low, or auto.

• If the compressor ceases operations when the conﬁgured temperature is reached, the indoor fan motor operates at the minimum or conﬁgured speed.

1.5.3 Outdoor Fan Control

• The outdoor unit will be run at different fan speed according to T4 and compressor frequency.

• For different outdoor units, the fan speeds are different.

1.5.4 Condenser Temperature Protection

When condenser temperature is more than setting value, the compressor ceases operations..

1.5.5 Evaporator Temperature Protection

When evaporator temperature drops below a conﬁgured value, the compressor and outdoor fan cease operations.

1.6 Heating Mode

1.6.1 Compressor Control

∆T means the temperature compensation.

• When T1-Ts>-∆T, the compressor ceases operation.

• When T1-Ts<-∆T-1.5°C, the compressor continues operation.

• When the AC is operating in mute mode, the compressor operates at a low frequency.

• When the current exceeds the preset value, the current protection function activates and the compressor ceases operation.

1.6.2 Indoor Fan Control:

• When the compressor is on, the indoor fan can be set to high/medium/low/auto. And the anti-cold wind function has the priority.

• When indoor unit coil temp. is low, the anti-cold air function will start and indoor fan motor will run at low speed, the speed can’t be changed ,when the temp. is lower than setting value, the indoor fan motor will stop.

• When the indoor temp reaches the setting temp., the compressor will stop, the indoor fan motor will run at the minimum speed or setting speed.(The anti-cold air function is valid).

1.6.3 Outdoor Fan Control:

• The outdoor unit will be run at different fan speed according to T4 and compressor frequency.

• For different outdoor units, the fan speeds are different.

1.6.4 Defrosting mode

• The unit enters defrosting mode according to the temperature value of T3 and T4 as well as the compressor running time.

• In defrosting mode, the compressor continues to run, the indoor and outdoor motor will cease operation, the defrost light of the indoor unit will turn on, and

the “ ” symbol is displayed.

• If any one of the following conditions is satisﬁed, defrosting ends and the machine switches to normal heating mode:

• T3 rises above TCDE1°C.

• T3 maintained above TCDE2°C for 80 seconds.

• Unit runs for 15 minutes consecutively in defrosting mode.

1.6.5 Evaporator Temperature Protection

When the evaporator temperature exceeds a preset protection value, the compressor ceases operations.

Product Features

 Page 16 

1.7 Auto-mode

• This mode can be selected with the remote controller and the setting temperature can be changed between 17°C~30°C.

• In auto mode, the machine selects cooling, heating, or fan-only mode on the basis of ∆T (∆T =T1-Ts).

∆T Running mode

∆T>2℃ Cooling

-2℃≤∆T≤2℃ Fan-only ∆T<-2℃ Heating*

Heating*: In auto mode, cooling only models run the fan

• The louver operates same as in relevant mode.

• If the machine switches mode between heating and cooling, the compressor will keep stopping for certain time and then choose mode according to T1-Ts.

• If the setting temperature is modiﬁed, the machine will choose running function again.

1.8 Drying mode

• Indoor fan speed is ﬁxed at breeze and can’t be changed. The louver angle is the same as in cooling mode.

• All protections are active and the same as that in cooling mode.

1.9 Forced operation function

• Forced cooling mode:

The compressor and outdoor fan continue to run and the indoor fan runs at low speed. After running for 30 minutes, the AC will switch to auto mode with a preset temperature of 24°C.

• Forced auto mode:

Forced auto mode operates the same as normal auto mode with a preset temperature of 24°C.

• The unit exits forced operation when it receives the following signals:

• Switch on

• Switch off

• Timer on

• Timer off

• Changes in:

• mode

• fan speed

• sleeping mode

• Follow me

1.10 Sleep function

• The sleep function is available in cooling, heating, or auto mode.

• The operational process for sleep mode is as follows:

• When cooling, the temperature rises 1°C (to not higher than 30°C) every hour. After 2 hours, the temperature stops rising and the indoor fan is ﬁxed at low speed.

• When heating, the temperature decreases 1°C(to not lower than 17°C) every hour. After 2 hours, the temperature stops decreasing and the indoor fan is ﬁxed at low speed. Anti-cold wind function takes priority.

• The operating time for sleep mode is 7 hours, after which, the unit exits this mode and switches off.

• The timer setting is available in this mode.

1.11 Auto-Restart function

• The indoor unit has an auto-restart module that allows the unit to restart automatically. The module automatically stores the current settings (not including the swing setting) and, in the case of a sudden power failure, will restore those setting automatically within 3 minutes after power returns.

• If the unit was in forced cooling mode, it will run in this mode for 30 minutes and turn to auto mode with temperature set to 24°C.

• If there is a power failure while the unit is running, the compressor starts 3 minutes after the unit restarts. If the unit was already off before the power failure, the compressor starts 1 minute after the unit restarts.

1.12 Refrigerant Leakage Detection

With this new technology, the display area will show “EC” when the outdoor unit detects refrigerant leakage.

1.13 8°C Heating(Optional)

In heating mode, the temperature can be set to as low as 8°C, preventing the indoor area from freezing if unoccupied during severe cold weather.

1.14 Self clean(Optional)

• If you press “Self Clean” when the unit is in cooling or drying mode:

• For cooling models, the indoor unit will run in low fan mode for a certain time, then ceases operation.

Product Features

 Page 17 

• For heat pump models, the indoor unit will run in fan-only mode, then low heat, and ﬁnally in fanonly mode.

• Self Clean keeps the indoor unit dry and prevents mold growth.

1.15 Follow me(Optional)

• If you press “Follow Me” on the remote, the indoor unit will beep. This indicates the follow me function is active.

• Once active, the remote control will send a signal every 3 minutes, with no beeps. The unit automatically sets the temperature according to the measurements from the remote control.

• The unit will only change modes if the information from the remote control makes it necessary, not from the unit’s temperature setting.

• If the unit does not receive a signal for 7 minutes or you press “Follow Me,” the function turns off. The unit regulates temperature based on its own sensor and settings.

1.16 Silence (Optional)

Press “Silence” on the remote control to enable the SILENCE function. While this function is active, the compressor frequency is maintained at a lower level than F2. The indoor unit will run at faint breeze, which reduces noise to the lowest possible level.

1.17 Information Inquiry

• To enter information inquiry status, complete the following procedure within ten seconds:

• Press LED 3 times.

• Press SWING 3 times.

• If you are successful, you will hear beeps for two seconds.

• Use the LED and SWING buttons to cycle through information displayed.

• Pressing LED will display the next code in the sequence. Pressing SWING will show the previous.

• The following table shows information codes. The screen will display this code for two seconds, then the information for 25 seconds.

Product Features

 Page 18 

Displayed code Explanation

Displayed

value

Meaning Additional Notes

Room temperature

-1F,-1E,-1d,-1c,1b,-1A

-19—99

A0,A1,…A9

b0,b1,…b9

c0,c1,…c9

d0,d1,…d9

E0,E1,…E9

F0,F1,…F9

-25,-24,-23,-22,

-21,-20

-19—99

100,101,…109

110,111,…119

120,121,…129

130,131,…139

140,141,…149

150,151,…159

1. All displayed temperatures use actual values.

2. All temperatures are displayed in °C regardless of remote used.

3. T1, T2, T3, T4, and T2B display ranges from -25 to 70 °C. TP display ranges from -20 to 130 °C.

4. The frequency display ranges from 0 to 159HZ.

5. If the actual values exceed or fall short of the deﬁned range, the values closest to the maximum and minimum values will be displayed.

Indoor coil temperature

Outdoor coil temperature

Ambient temperature

Outlet temperature of indoor coil

Discharge temperature

Suction temperature

Targeted frequency

Actual frequency

Indoor fan speed

1,2,3,4

14-FF

OFF

Low speed, Medium speed, High speed, Turbo.

Actual fan speed is equal to the display value converted to decimal value and multiplied by 10. This is measured in RPM.

N/A

Used for some large capacity motors.

Used for some small capacity motors.

The display value is 14-FF (hexadecimal). The corresponding fan speed ranges from 200 to 2550RPM.

Outdoor fan speed

EXV opening angle 0-FF

Actual EXV opening value is equal to the display value converted to decimal value and then multiplied by 2.

Compressor continuous running time

0-FF 0-255 minutes

If the actual value exceeds or falls short of the deﬁned range, the value closest to the maximum and minimum will be displayed.

Causes of compressor stop

0-99

For a detailed explanation, contact technical support.

Product Features

 Page 19 

Displayed code Explanation

Displayed

value

Meaning Additional Notes

Reserved

0-FF

2-28

5-20

5-25

- -

Contents

1. Maintenance ........................................................................................................21

1.1 First Time Installation Check ........................................................................21

1.2 Refrigerant Recharge ...................................................................................23

1.3 Re-Installation .............................................................................................24

1.3.1 Indoor Unit ..................................................................................24

1.3.2 Outdoor Unit ...............................................................................26

2. Disassembly .........................................................................................................28

2.1 Indoor Unit ..................................................................................................28

2.2 Outdoor Unit ...............................................................................................40

Maintenance and Disassembly

Maintenance and

Disassembly

 Page 21 

1. Maintenance

1.1 First Time Installation Check

Air and moisture trapped in the refrigerant system affects the performance of the air conditioner by:

• Increasing pressure in the system.

• Increasing the operating current.

• Decreasing the cooling or heating efﬁciency.

• Congesting the capillary tubing due to ice build-up in the refrigerant circuit.

• Corroding the refrigerant system.

To prevent air and moisture from affecting the air conditioner’s performance, the indoor unit, as well as the pipes between the indoor and outdoor unit, must be be leak tested and evacuated.

Leak test (soap water method)

Use a soft brush to apply soapy water or a neutral liquid detergent onto the indoor unit connections and outdoor unit connections. If there is gas leakage, bubbles will form on the connection.

Air purging with vacuum pump

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Maintenance and

Disassembly

 Page 22 

Procedure:

1. Tighten the ﬂare nuts of the indoor and outdoor

units, and conﬁrm that both the 2- and 3-way valves are closed.

2. Connect the charge hose with the push pin of Handle Lo to the gas service port of the 3-way valve.

3. Connect another charge hose to the vacuum pump.

4. Fully open the Handle Lo manifold valve.

5. Using the vacuum pump, evacuate the system for

30 minutes.

a. Check whether the compound meter indicates

-0.1 MPa (14.5 Psi).

• If the meter does not indicate -0.1 MPa (14.5 Psi) after 30 minutes, continue evacuating for an additional 20 minutes.

• If the pressure does not achieve -0.1 MPa

(14.5 Psi) after 50 minutes, check for leakage.

• If the pressure successfully reaches -0.1 MPa (14.5 Psi), fully close the Handle Lo valve, then cease vacuum pump operations.

b. Wait for 5 minutes then check whether the gauge

needle moves after turning off the vacuum pump. If the gauge needle moves backward, check wether there is gas leakage.

6. Loosen the ﬂare nut of the 3-way valve for 6 or 7 seconds and then tighten the ﬂare nut again.

a. Conﬁrm the pressure display in the pressure

indicator is slightly higher than the atmospheric pressure.

b. Remove the charge hose from the 3-way valve.

7. Fully open the 2- and 3-way valves and tighten the

cap of the 2- and 3-way valves.

Maintenance and

Disassembly

 Page 23 

1.2 Refrigerant Recharge

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Prior to recharging the refrigerant, conﬁrm the additional amount of refrigerant required using the following table:

Models Standard length Max. elevation Max. length Additional refrigerant

9k&12k 5m (16.4ft) 10m (32.8ft) 25m (82.0ft) 12g/m (0.13oz/ft)

18k 5m (16.4ft) 20m (65.6ft) 30m (98.4ft) 12g/m (0.13oz/ft)

24k 5m (16.4ft) 25m (82ft) 50m (164ft) 24g/m (0.26oz/ft)

Procedure:

1. Close both 2- and 3-way valves.

2. Slightly connect the Handle Lo charge hose to the

3-way service port.

3. Connect the charge hose to the valve at the bottom of the cylinder.

4. If the refrigerant is R410A, invert the cylinder to ensure a complete liquid charge.

5. Open the valve at the bottom of the cylinder for 5 seconds to purge the air in the charge hose, then fully tighten the charge hose with push pin Handle Lo to the service port of 3-way valve..

6. Place the charging cylinder onto an electronic scale and record the starting weight.

7. Fully open the Handle Lo manifold valve, 2- and

3-way valves.

8. Operate the air conditioner in cooling mode to charge the system with liquid refrigerant.

9. When the electronic scale displays the correct weight (refer to the gauge and the pressure of the low side to conﬁrm), turn off the air conditioner, then disconnect the charge hose from the 3-way service port immediately..

10. Mount the caps of service port and 2- and 3-way valves.

11. Use a torque wrench to tighten the caps to a torque of 18 N.m.

12. Check for gas leakage.

Maintenance and

Disassembly

 Page 24 

1.3 Re-Installation

1.3.1 Indoor Unit

Collecting the refrigerant into the outdoor unit

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Procedure:

1. Conﬁrm that the 2- and 3-way valves are opened.

2. Connect the charge hose with the push pin of Handle

Lo to the 3-way valve’s gas service port.

3. Open the Handle Lo manifold valve to purge air from the charge hose for 5 seconds and then close it quickly.

4. Close the 2-way valve.

5. Operate the air conditioner in cooling mode. Cease

operations when the gauge reaches 0.1 MPa (14.5 Psi).

6. Close the 3-way valve so that the gauge rests between 0.3 MPa (43.5 Psi) and 0.5 MPa (72.5 Psi).

7. Disconnect the charge set and mount the caps of service port and 2- and 3-way valves.

8. Use a torque wrench to tighten the caps to a torque of 18 N.m.

9. Check for gas leakage.

Maintenance and

Disassembly

 Page 25 

Air purging with vacuum pump

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Procedure:

1. Tighten the ﬂare nuts of the indoor and outdoor

units, and conﬁrm that both the 2- and 3-way valves are closed.

2. Connect the charge hose with the push pin of Handle Lo to the gas service port of the 3-way valve.

3. Connect another charge hose to the vacuum pump.

4. Fully open the Handle Lo manifold valve.

5. Using the vacuum pump, evacuate the system for 30

minutes.

a. Check whether the compound meter indicates

-0.1 MPa (14.5 Psi).

• If the meter does not indicate -0.1 MPa (14.5 Psi) after 30 minutes, continue evacuating for an additional 20 minutes.

• If the pressure does not achieve -0.1 MPa (14.5

Psi) after 50 minutes, check for leakage.

• If the pressure successfully reaches -0.1 MPa (14.5 Psi), fully close the Handle Lo valve, then cease vacuum pump operations.

b. Wait for 5 minutes then check whether the gauge

needle moves after turning off the vacuum pump. If the gauge needle moves backward, check wether there is gas leakage.

6. Loosen the ﬂare nut of the 3-way valve for 6 or 7 seconds and then tighten the ﬂare nut again.

a. Conﬁrm the pressure display in the pressure

indicator is slightly higher than the atmospheric pressure.

b. Remove the charge hose from the 3-way valve.

7. Fully open the 2- and 3-way valves and tighten the

cap of the 2- and 3-way valves.

Maintenance and

Disassembly

 Page 26 

1.3.2 Outdoor Unit

Evacuation for the whole system

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Procedure:

1. Conﬁrm that the 2- and 3-way valves are opened.

2. Connect the vacuum pump to the 3-way valve’s

service port.

3. Evacuate the system for approximately one hour. Conﬁrm that the compound meter indicates

-0.1 MPa (14.5Psi).

4. Close the valve (Low side) on the charge set and turn off the vacuum pump.

5. Wait for 5 minutes then check whether the gauge

needle moves after turning off the vacuum pump. If the gauge needle moves backward, check whether there is gas leakage.

6. Disconnect the charge hose from the vacuum pump.

7. Mount the caps of service port and 2- and 3-way

valves.

8. Use a torque wrench to tighten the caps to a torque of 18 N.m.

Maintenance and

Disassembly

 Page 27 

Refrigerant charging

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Note: 1. Mechanical connectors used indoors shall comply with local regulations.

2. When mechanical connectors are reused indoors, sealing parts shall be renewed. When ﬂared joints are reused indoors, the ﬂare part shall be re-fabricated.

Procedure:

1. Close both 2- and 3-way valves.

2. Slightly connect the Handle Lo charge hose to the

3-way service port.

3. Connect the charge hose to the valve at the bottom of the cylinder.

4. If the refrigerant is R410A, invert the cylinder to ensure a complete liquid charge.

5. Open the valve at the bottom of the cylinder for 5 seconds to purge the air in the charge hose, then fully tighten the charge hose with push pin Handle Lo to the service port of 3-way valve..

6. Place the charging cylinder onto an electronic scale and record the starting weight.

7. Fully open the Handle Lo manifold valve, 2- and

3-way valves.

8. Operate the air conditioner in cooling mode to charge the system with liquid refrigerant.

10. Mount the caps of service port and 2- and 3-way valves.

11. Use a torque wrench to tighten the caps to a torque of 18 N.m.

12. Check for gas leakage.

Maintenance and

Disassembly

 Page 28 

2. Disassembly

2.1 Indoor unit

1. Front Panel

Procedure Illustration

1) Hold the front panel by the tabs on the both sides and lift it (see CJ_AF_ INV_001).

2) Push up the bottom of an air ﬁlter, and then pull it out downwards (see CJ_AF_INV_002).

CJ_AF_INV_001

CJ_AF_INV_002

Note: This section is for reference only. Actual unit appearance may vary.

Front Panel

Tab

Filter

Maintenance and

Disassembly

 Page 29 

Procedure Illustration

3) Open the horizontal louver and push the hook towards left to open it (see CJ_AF_INV_003).

4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_AF_INV_004).

CJ_AF_INV_003

CJ_AF_INV_004

Note: This section is for reference only. Actual unit appearance may vary.

Hook

Horizontal Louver

Hook

Maintenance and

Disassembly

 Page 30 

Procedure Illustration

5) Remove 1 screw and then remove the electrical cover(see CJ_AF_INV_005-1 and CJ_AF_INV_005-2).

6) Disconnect the connector for display board(see CJ_AF_INV_005-3) .

7) Remove the display board(see CJ_AF_ INV_005-4).

CJ_AF_INV_005

Note: This section is for reference only. Actual unit appearance may vary.

CJ_AF_INV_005-1

CJ_AF_INV_005-2

CJ_AF_INV_005-3

CJ_AF_INV_005-4

Maintenance and

Disassembly

 Page 31 

Procedure Illustration

8) Open the screw caps(2) and the remove the screws(see CJ_AF_ INV_006).

9) Release the 4 hooks.

10) Release the seven hooks in the back (see CJ_AF_INV_007).

CJ_AF_INV_006

CJ_AF_INV_007

Note: This section is for reference only. Actual unit appearance may vary.

Hooks

Maintenance and

Disassembly

 Page 32 

Procedure Illustration

11) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger (see CJ_AF_INV_008).

CJ_AF_INV_008

Note: This section is for reference only. Actual unit appearance may vary.

Panel Frame

Maintenance and

Disassembly

 Page 33 

2. Electrical parts

Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts.

Procedure Illustration

1) Remove the ﬁxing screw and then remove the cover of electronic box and the terminal cover (see CJ_AF_ INV_009).

2) Pull out the room temperature sensor (T1) and the coil temperature sensor (T2) (see CJ_AF_INV_010).

3) Remove the two screws used for the ground connection (see CJ_AF_ INV_010).

CJ_AF_INV_009

CJ_AF_INV_010

Note: This section is for reference only. Actual unit appearance may vary.

T1 Sensor

Ground Screws

T2 Sensor

Fixing Screw

Electronic Cover

Maintenance and

Disassembly

 Page 34 

Procedure Illustration

4) Remove the ﬁxing screw (see CJ_AF_ INV_011-1).

5) Pull out the Electrical control box along the direction indicated in right image. to remove it (CJ_AF_INV_011-2).

6) Disconnect the wires. Then remove the electronic main board (CJ_AF_ INV_012).

CJ_AF_INV_011-2

CJ_AF_INV_012

Note: This section is for reference only. Actual unit appearance may vary.

Fixing Screw

Electronic Box

Indoor Fan Motor

Applicable to AC Motor Only

Swing Motor

Display Board

Pipe Temperature Sensor

Room Temperature Sensor

CJ_AF_INV_011-1

Maintenance and

Disassembly

 Page 35 

Procedure Illustration

7) Remove the ﬁxing screw, then remove the capacitor of fan motor (see CJ_AF_ INV_013).

CJ_AF_INV_013

Note: This section is for reference only. Actual unit appearance may vary.

Capacitor of Fan Motor

Maintenance and

Disassembly

 Page 36 

3. Evaporator

Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before disassembling evaporator.

Procedure Illustration

1) Disassemble the pipe holder located at the rear of the unit (see CJ_AF_INV_014).

2) Remove the screws on the evaporator located at the ﬁxed plate (see CJ_AF_ INV_015).

3) Remove the two screws on the evaporator located at the base of the bearing side (see CJ_AF_INV_016).

CJ_AF_INV_014

CJ_AF_INV_015

CJ_AF_INV_016

Note: This section is for reference only. Actual unit appearance may vary.

Pipe Holder

Screws

Maintenance and

Disassembly

 Page 37 

Procedure Illustration

4) Pull out the evaporator (see CJ_AF_ INV_017).

CJ_AF_INV_017

Note: This section is for reference only. Actual unit appearance may vary.

Evaporator

Maintenance and

Disassembly

 Page 38 

4. Fan motor and fan

Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and

3. Evaporator). before disassembling fan motor and fan.

Procedure Illustration

1) Remove the two screws and remove the ﬁxing board of the fan motor (see CJ_AF_ INV_018).

2) Remove the Bearing sleeve(see CJ_AF_ INV_019).

3) Remove the ﬁxing screw (see CJ_AF_ INV_020).

4) Pull out the fan motor and fan assembly from the side.

CJ_AF_INV_018

CJ_AF_INV_019

CJ_AF_INV_020

Note: This section is for reference only. Actual unit appearance may vary.

Fixing Screw

Screws

Maintenance and

Disassembly

 Page 39 

5. Step motor

Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before disassembling step motor.

Procedure Illustration

1) Remove the two screws, then remove the stepping motor (see CJ_AF_INV_021).

CJ_AF_INV_021

Note: This section is for reference only. Actual unit appearance may vary.

Stepping Motor

Maintenance and

Disassembly

 Page 40 

2.2 Outdoor unit

1. Panel Plate

O3MVO32-09, O3MVO32-12

Procedure Illustration

1) Turn off the air conditioner and the power breaker.

2) Remove the screws of the big handle and then remove the big handle (1 screws) (see CJ_AB30_INV_001).

3) Remove the screws of the top cover and then remove the top cover (3 screws). One of the screws is located underneath the big handle (see CJ_ AB30_INV_002).

CJ_AB30_INV_001

CJ_AB30_INV_002

Note: This section is for reference only. Actual unit appearance may vary.

Big Handle

Top Cover

Maintenance and

Disassembly

 Page 41 

Procedure Illustration

4) Remove the screws of the front panel and then remove the front panel (6 screws) (see CJ_AB30_INV_003).

5) Remove the screws of water collecting cover (1 screw) (see CJ_AB30_ INV_004).

CJ_AB30_INV_003

CJ_AB30_INV_004

Note: This section is for reference only. Actual unit appearance may vary.

Front Panel

Water Collecting Cover

Maintenance and

Disassembly

 Page 42 

Procedure Illustration

1) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_AB30_INV_005).

CJ_AB30_INV_005

Note: This section is for reference only. Actual unit appearance may vary.

Right Panel

Maintenance and

Disassembly

 Page 43 

O3MVO32-18,

Procedure Illustration

1) Turn off the air conditioner and the power breaker.

2) Remove the screws of the big handle and then remove the big handle (1 screws) (see CJ_B30_INV_001).

3) Remove the screws of the top cover and then remove the top cover (3 screws). One of the screws is located underneath the big handle (see CJ_ B30_INV_002).

CJ_B30_INV_001

CJ_B30_INV_002

Note: This section is for reference only. Actual unit appearance may vary.

Top Cover

Big Handle

Maintenance and

Disassembly

 Page 44 

Procedure Illustration

1) Remove the screws of the front panel and then remove the front panel (8 screws) (see CJ_B30_INV_003).

2) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_B30_ INV_004).

CJ_B30_INV_003

CJ_B30_INV_004

Note: This section is for reference only. Actual unit appearance may vary.

Front Panel

Water Collecting Cover

Maintenance and

Disassembly

 Page 45 

Procedure Illustration

3) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B30_INV_005).

CJ_B30_INV_005

Note: This section is for reference only. Actual unit appearance may vary.

Right Panel

Maintenance and

Disassembly

 Page 46 

O3MVO32-24

Procedure Illustration

1) Turn off the air conditioner and the power breaker.

2) Remove the screws of the big handle and then remove the big handle (1 screws) (see CJ_CA30_INV_001).

3) Remove the screws of the top cover and then remove the top cover (3 screws). One of the screws is located underneath the big handle (see CJ_ CA30_INV_002).

CJ_CA30_INV_001

CJ_CA30_INV_002

Note: This section is for reference only. Actual unit appearance may vary.

Top Cover

Big Handle

Maintenance and

Disassembly

 Page 47 

Procedure Illustration

4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_CA30_INV_003).

5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_ CA30_INV_004).

CJ_CA30_INV_003

CJ_CA30_INV_004

Note: This section is for reference only. Actual unit appearance may vary.

Front Panel

Water Collecting Cover

Maintenance and

Disassembly

 Page 48 

Procedure Illustration

1) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_CA30_INV_005).

CJ_CA30_INV_005

Note: This section is for reference only. Actual unit appearance may vary.

Right Panel

Maintenance and

Disassembly

 Page 49 

2. Fan disassembly

Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan.

O3MVO32-09,

O3MVO32-12, O3MVO32-18

Procedure Illustration

1) Remove the nut securing the fan with a spanner (see CJ_ODU_

INV_001).

2) Remove the fan.

3) Remove the screws of the top cover. (2 screws) (see CJ_ODU_INV_002).

4) Unﬁx the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_INV_003).

CJ_ODU_INV_001

CJ_ODU_INV_002

CJ_ODU_INV_003

Note: This section is for reference only. Actual unit appearance may vary.

D-cut

Hook

Maintenance and

Disassembly

 Page 50 

Procedure Illustration

5) Disconnect the connector for fan motor from the electronic control board (see

CJ_ODU_INV_004).

6) Remove the ﬁxing screws of the fan motor (4 screws) (see CJ_ODU_INV_005).

7) Remove the fan motor.

CJ_ODU_INV_004

CJ_ODU_INV_005

Note: This section is for reference only. Actual unit appearance may vary.

Fan Motor

Maintenance and

Disassembly

 Page 51 

O3MVO32-24

Procedure Illustration

1) Remove the nut securing the fan with a spanner (see CJ_ODU_

INV_006).

2) Remove the fan.

3) Unﬁx the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_INV_007).

CJ_ODU_INV_006

CJ_ODU_INV_007

Note: This section is for reference only. Actual unit appearance may vary.

Hook

D-cut

Maintenance and

Disassembly

 Page 52 

Procedure Illustration

4) Disconnect the connector for fan motor from the electronic control board (see

CJ_ODU_INV_008).

5) Remove the ﬁxing screws of the fan motor (4 screws) (see CJ_ODU_INV_009).

6) Remove the fan motor.

CJ_ODU_INV_008

CJ_ODU_INV_009

Note: This section is for reference only. Actual unit appearance may vary.

Maintenance and

Disassembly

 Page 53 

3. Electrical parts

Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before

disassembling electrical parts.

O3MVO32-09,

O3MVO32-12, O3MVO32-18

Procedure Illustration

1) Remove the connector for the compressor (see CJ_ODU_INV_010).

2) Pull out the two blue wires connected with the four way valve (CJ_ODU_

INV_010).

3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp. sensor(TP) (CJ_ODU_INV_010).

4) Disconnect the electronic expansion valve wire (CJ_ODU_INV_010).

5) Then remove the electronic control box (see CJ_ODU_INV_010).

CJ_ODU_INV_010

Compressor

T3, T4, TP

Electronic Expansion Valve

4-Way Valve

Maintenance and

Disassembly

 Page 54 

O3MVO32-24

Procedure Illustration

1) Remove the connector for the compressor (see CJ_ODU_INV_011).

2) Pull out the two blue wires connected with the four way valve (see CJ_ODU_

INV_011).

3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp. sensor(T5) (see CJ_ODU_INV_011).

4) Disconnect the electronic expansion valve wire (see Fig CJ_ODU_INV_011).

5) Remove the connector for the DR and reactor (see Fig CJ_ODU_INV_011).

6) Then remove the electronic control box (see Fig CJ_ODU_INV_011).

CJ_ODU_INV_011

Note: This section is for reference only. Actual unit appearance may vary.

Reactor

T3, T4, TP

Compressor

4-Way Valve

Electronic Expansion Valve

Maintenance and

Disassembly

 Page 55 

4. Sound blanket

WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor.

Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling sound blanket.

Procedure Illustration

1) Remove the sound blanket (side and top) (see CJ_ODU_INV_012).

CJ_ODU_INV_012

Note: This section is for reference only. Actual unit appearance may vary.

Sound Blanket(side)

Sound Blanket(top)

Maintenance and

Disassembly

 Page 56 

5. Four-way valve (for heat pump models)

WARNING: Recover refrigerant from the refrigerant circuit before remove the four-way valve.

Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling four-way valve.

Procedure Illustration

1) Heat up the brazed parts and then detach the the four-way valve and the pipe (see CJ_ODU_INV_013).

2) Remove the four-way valve assembly with pliers.

CJ_ODU_INV_013

Note: This section is for reference only. Actual unit appearance may vary.

Maintenance and

Disassembly

 Page 57 

6. Compressor

WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor.

Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling compressor.

Procedure Illustration

1) Remove the ﬂange nut of terminal cover and remove the terminal cover (see CJ_

ODU_INV_014).

2) Disconnect the connectors (see CJ_ODU_

INV_015).

CJ_ODU_INV_014

CJ_ODU_INV_015

Note: This section is for reference only. Actual unit appearance may vary.

Terminal Cover

Maintenance and

Disassembly

 Page 58 

Procedure Illustration

3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_INV_016).

4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_017).

5) Lift the compressor from the base pan assembly with pliers.

CJ_ODU_INV_016

CJ_ODU_INV_017

Note: This section is for reference only. Actual unit appearance may vary.

Discharge Pipe

Suction Pipe

Contents

1. Safety Caution .....................................................................................................61

2. General Troubleshooting ....................................................................................62

3. Error Diagnosis and Troubleshooting Without Error Code ...............................63

3.1 Remote maintenance ...................................................................................63

3.2 Field maintenance .......................................................................................64

4. Quick Maintenance by Error Code ......................................................................65

5. Troubleshooting by Error Code ...........................................................................70

5.1 Common Check Procedures.........................................................................70

5.2 E0/F4 (EEPROM parameter error) .................................................................72

5.3 E1 (Indoor and outdoor unit communication error) ......................................73

5.4 E2 (Zero crossing detection error diagnosis and solution) ............................75

5.4 E3/F5 (Fan speed is operating outside of the normal range diagnosis and

solution) ......................................................................................................76

5.5 E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis

and solution) ................................................................................................78

5.6 E7 (Indoor PCB /Display board communication error) ...................................79

5.7 EC (Refrigerant Leakage Detection diagnosis and solution) ..........................80

5.8 F0(Overload current protection diagnosis and solution) ................................81

5.9 P0(IPM malfunction or IGBT over-strong current protection diagnosis and

Troubleshooting

Contents

solution) .....................................................................................................82

5.10 P1(Over voltage or too low voltage protection diagnosis and solution) .........83

5.11 P2(High temperature protection of IPM module diagnosis and solution) .......84

5.12 P4(Inverter compressor drive error diagnosis and solution) ...........................85

Troubleshooting

 Page 61 

1. Safety Caution

WARNING

Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting.

For other models, connect discharge resistance (approx.100Ω 40W) or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor. The terminals are located on the bottom surface of the outdoor PCB.

Note: This picture is for reference only. Actual appearances may vary.

Electrolytic Capacitors

Troubleshooting

 Page 62 

2. General Troubleshooting

2.1 Error Display (Indoor Unit)

When the indoor unit encounters a recognized error, the operation lamp will ﬂash in a corresponding series, the timer lamp may turn on or begin ﬂashing, and an error code will be displayed. These error codes are described in the following table:

Operation

lamp

ﬂashes

Timer lamp

LED

Display

Error Information Solution

1 time

OFF E0

Indoor unit EEPROM parameter error Page 72

2 times

OFF E1

Indoor / outdoor units communication error Page 73

3 times

OFF E2

Zero-crossing signal detection error Page 75

4 times

OFF E3

The indoor fan speed is operating outside of the normal range Page 76

5 times

OFF E4

Indoor room temperature sensor T1 is in open circuit or has short circuited

Page 78

6 times

OFF E5

Evaporator coil temperature sensor T2 is in open circuit or has short circuited

Page 78

9 times

OFF E7

Indoor PCB /Display board communication error Page 79

7 times

OFF EC

Refrigerant leak detected Page 80

1 time

ON F0

Overload current protection Page 81

2 times

ON F1

Outdoor ambient temperature sensor T4 open circuit or short circuit

Page 78

3 times

ON F2

Condenser coil temperature sensor T3 is in open circuit or has short circuited

Page 78

4 times

ON F3

Compressor discharge temperature sensor TP open circuit or short circuit

Page 78

5 times

ON F4

Outdoor unit EEPROM parameter error Page 72

6 times

ON F5

The outdoor fan speed is operating outside of the normal range Page 76

1 time

FLASH p0

IPM malfunction or IGBT over-strong current protection Page 82

2 times

FLASH p1

Over voltage or over low voltage protection Page 83

3 times

FLASH p2

High temperature protection of IPM module Page 84

5 times

FLASH p4

Inverter compressor drive error Page 85

For other errors:

The display board may show a garbled code or a code undeﬁned by the service manual. Ensure that this code is not a temperature reading.

Troubleshooting:

Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement. If the unit responds, the display board requires replacement.

Troubleshooting

 Page 63 

3. Error Diagnosis and Troubleshooting Without Error Code

WARNING

Be sure to turn off unit before any maintenance to prevent damage or injury.

3.1 Remote maintenance

SUGGESTION: When troubles occur, please check the following points with customers before ﬁeld maintenance.

Problem Solution

1 Unit will not start Page 66-67

2 The power switch is on but fans will not start Page 66-67

3 The temperature on the display board cannot be set Page 66-67

4 Unit is on but the wind is not cold(hot) Page 66-67

5 Unit runs, but shortly stops Page 66-67

6 The unit startup and stop frequently Page 66-67

7 Unit runs continuously but insufﬁcient cooling(heating) Page 66-67

8 Cool can not change to heat Page 66-67

9 Unit is noisy Page 66-67

Troubleshooting

 Page 64 

3.2 Field maintenance

Problem Solution

1 Unit will not start Page 68-69

2 Compressor will not start but fans run Page 68-69

3 Compressor and condenser (outdoor) fan will not start Page 68-69

4 Evaporator (indoor) fan will not start Page 68-69

5 Condenser (Outdoor) fan will not start Page 68-69

6 Unit runs, but shortly stops Page 68-69

7 Compressor short-cycles due to overload Page 68-69

8 High discharge pressure Page 68-69

9 Low discharge pressure Page 68-69

10 High suction pressure Page 68-69

11 Low suction pressure Page 68-69

12 Unit runs continuously but insufﬁcient cooling Page 68-69

13 Too cool Page 68-69

14 Compressor is noisy Page 68-69

15 Horizontal louver can not revolve Page 68-69

Troubleshooting

 Page 65 

4. Quick Maintenance by Error Code

If you do not have the time to test whether speciﬁc parts are faulty, you can directly change the required parts according the error code.

You can ﬁnd the parts to replace by error code in the following table.

Part requiring replacement

Error Code

E0 E1 E3 E4 E5 E7 EC F0 F1

Indoor PCB

x x

Outdoor PCB x x x x x x

Reactor x x x x x x x x

Indoor fan motor x x x x x x x x

Outdoor fan motor x x X x x x x x x

Temperature sensor x x x x x

T2 Sensor x x x x x x x x

Additional refrigerant x x x x x x x x x

Compressor x x x x x x x x

IPM board x x x x x x x x x

Outdoor unit x x x x x x x x

Display board x x x x x x x x

Part requiring replacement

Error Code

F2 F3 F4 F5 P0 P1 P2 P4

Indoor PCB

x x x x x x x x

Outdoor PCB

Reactor x x x x x x x

Indoor fan motor x x x x x x x x

Outdoor fan motor x x x x x x x

Temperature sensor x x x X x x

T2 Sensor x x x x x x x x

Additional refrigerant x x x x x x x x

Compressor x x x x x x

IPM board x x x x x

Outdoor unit x x x x x x x x

Troubleshooting

 Page 66 

1.Remote Maintenance

Possible causes of trouble

Power failure

The main power tripped

Loose connections

Faulty transformer

The voltage is too high or too low

The r emote c ontrol is power ed off

Broken remote control

Dirty air filter

Dirty condenser fins

The setting temperature is higher/lower than the

room's(cooling/heating)

The ambient temperature is too high/low when the

mode is cooling/heating

Fan mode

SILENCE function is activated(optional function)

Frosting and defrosting frequently

Unit will not start ☆ ☆

☆

The power switch is on but fans will not start

☆ ☆ ☆

The temperature on the di spl ay board cannot be set ☆

☆

Unit is on but the wind is not cold(hot) ☆

☆ ☆

Unit runs, but shortly stops ☆ ☆ ☆

The unit starts up and stops frequently ☆ ☆ ☆

Unit runs continuous ly but ins uffici ent cooling(heating) ☆ ☆ ☆

☆ ☆

Cool can not change to heat

Unit is noisy

Test method / remedy

Test voltage

Close the power switch

Inspect connections - tighten

Change the transformer

Test voltage

Replace the battery of the remote control

Replace the remote contr ol

Clean or replac e

Clean

Adjust the setting temperatur e

Turn the AC later

Adjust to cool mode

Turn off SILENCE function.

Turn the AC later

Refrigerant Circuit

Electrical Circuit

Troubleshooting

 Page 67 

Heavy load condition

Loosen hold down bolts and / or screws

Bad air proof

The air inlet or outlet of either unit is blocked

Inter fer enc e from cell phone tower s and remote

boosters

Shipping plates remain attached

☆

☆ ☆ ☆

☆ ☆

Check heat load

Tighten bolts or screws

Close all the windows and doors

Remove the obstacles

Reconn ect the power or press ON/OFF

button on remote c ontr ol to restar t

Remove them

Others

Troubleshooting

 Page 68 

2.Field Maintenance

Possible causes of trouble

Power failure

Blown fuse or varistor

Loose connections

Shorted or broken wires

Safety device opens

Faulty thermostat / r oom temperatur e sensor

Wr ong settin g place of temper ature sensor

Faulty transfor mer

Shorted or open capacitor

Faulty magnetic contactor for compressor

Faulty magnetic contactor for fan

Low voltage

Faulty stepping motor

Shorted or grounded compressor

Shorted or grounded fan motor

Unit will not start ☆

☆ ☆

☆ ☆ ☆

Compressor will not start but fans run

☆

☆ ☆

Compressor and condenser (outdoor) fan wil l not start ☆

☆

Evaporator (indoor) fan will not start ☆ ☆ ☆ ☆

Condenser (Outdoor) fan will not start

☆ ☆

☆

☆ ☆

Unit runs, but shortly stops ☆ ☆

Compressor s hort-cycles due to overload ☆

☆

High discharge pressure

Low dis charge pressure

High suction pressure

Low suction pressure

Unit runs continuous ly but ins uffici ent cooli ng

Too cool

☆ ☆

Compressor is noisy

Horizontal louver ca n not revolve ☆ ☆ ☆

Test method / remedy

Test voltage

Inspect fuse type & size

Inspect connections - tighten

Test circuits with tester

Test co ntinuity of safety d evice

Test co ntinuity of thermostat / sensor & wiring

Place the temperatur e sensor at the central of

the air inlet grille

Chec k control circ uit with tester

Chec k capacitor with tester

Test co ntinuity of coil & c ontac ts

Test voltage

Replace the stepping motor

Check r esistanc e with multimeter

Electrical Circuit

Troubleshooting

 Page 69 

Compressor stuck

Shortage of refrigerant

Restricted liquid line

Dirty air filter

Dirty evaporator coil

Insufficient air through evaporator coil

Overcharge of refrigerant

Dirty or partially blocked condenser

Air or incompressible gas in refrigerant cycle

Short cycling of condensing air

High temperature condensing medium

Insufficient condensing medium

Broken compressor internal parts

Ineffic ient c omp ressor

Expansion valve obstructed

Expansion valve or capillary tube closed completely

Leaking power element on exp ansion valve

Poor installation of feeler bulb

Heavy load condition

Loosen hold down bolts and / or screws

Shipping plates remain attached

Poor choices of capacity

Contact of piping with other piping or external plate

☆

☆ ☆

☆ ☆☆☆ ☆ ☆

☆ ☆

☆

☆ ☆ ☆

☆

☆ ☆ ☆

☆

☆ ☆ ☆ ☆

☆ ☆

☆ ☆ ☆

☆ ☆

☆

☆ ☆

☆

Replace the co mpressor

Leak test

Replace r estr icted part

Clean or rep lace

Clean coil

Check fan

Change charged refrigerant volume

Clean condenser or remove obstacle

Purge, evacuate and recharge

Remove obstruction to air flow

Remove obstruction in air or water flow

Replace c omp ressor

Test c ompressor effic ienc y

Replace v alve

Fix feeler bu lb

Check h eat load

Tighten bolts or screws

Remove them

Choose AC of lager capacity or add the number

of AC

Rectify piping so as not to contact each other or

with ex ternal plate

Refrigerant Circuit

Others

Troubleshooting

 Page 70 

5. Troubleshooting by Error Code

5.1 Common Check Procedures

5.1.1 Temperature Sensor Check

Disconnect the temperature sensor from PCB, measure the resistance value with a tester.

Temperature Sensors.

Room temp.(T1) sensor,

Indoor coil temp.(T2) sensor,

Outdoor coil temp.(T3) sensor,

Outdoor ambient temp.(T4) sensor,

Compressor discharge temp.(Tp) sensor.

Measure the resistance value of each winding by using the multi-meter.

5.1.2 Compressor checking

Measure the resistance value of each winding by using the tester.

Position

Resistance Value

KSK89D53UEZ KSM135D23UFZ KTF235D22UMT

Blue - Red

2.35Ω(20°C/68°F) 1.28Ω(20°C/68°F) 0.75Ω(20°C/68°F)Blue - Black

Red - Blue

Troubleshooting

 Page 71 

5.1.3 IPM Continuity Check

Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N.

Digital tester

Normal resistance

value

Digital tester

Normal resistance

value

(+)Red (-)Black

∞

(Several MΩ)

(+)Red (-)Black

∞

(Several MΩ)

N U

U V

V W

W (+)Red

Troubleshooting

 Page 72 

5.2 E0/F4 (EEPROM parameter error)

Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.

Recommended parts to prepare:

• Faulty indoor PCB

• Faulty outdoor PCB

Troubleshooting and repair:

Shut off the power supply and turn it

on 2 minutes later.

Is it still displaying the error

code?

The unit is operating normally.

If the EEPROM chip is welded on main

PCB, replace the main PCB directly.

Otherwise, check if the EEPROM chip

plugged in main PCB well.

YES

Is it plugged well?

Correct the connection.

Replace the indoor/outdoor

main PCB.

Remarks:

The location of the EEPROM chip on the indoor and outdoor PCB is shown in the following two images:

Note: These images are for reference only.

Troubleshooting

 Page 73 

5.3 E1 (Indoor and outdoor unit communication error)

Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, four consecutive times.

Recommended parts to prepare:

• Faulty indoor PCB

• Faulty outdoor PCB

• Faulty reactor

Troubleshooting and repair:

Power off, then restart the unit after 2 minutes.

Does a problem remain?

The unit is operating normally

Measure Vs. (Vs is the voltage between S and N of

outdoor unit. Red pan-S, Black pan-N)

YES

Is the voltage moving

alternately between Positive and

negative?

Check the outdoor wiring connection.

Is it normal?

Check the reactor.

YES

Is it normal?

Replace the outdoor PCB.

Power on.

YES

Is the error

resolved?

Replace the indoor PCB.

Replace the

reactor

Check the indoor wiring

connections

Is it normal?

Replace the indoor PCB.

Power on.

YES

Is the error resolved?

Replace the outdoor PCB.

The voltage moves alternately with

positive value.

The voltage is a

certain value

Troubleshooting

 Page 74 

Remarks:

• Use a multimeter to test the resistance of the reactor which does not connect with capacitor.

• The normal value should be around zero ohm. Otherwise, the reactor must have malfunction.

Troubleshooting

 Page 75 

5.4 E2 (Zero crossing detection error diagnosis and solution)

Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time

interval is abnormal.

Recommended parts to prepare:

• Connection mistake

• Faulty PCB

Troubleshooting and repair:

Check the connections and

power supply.

Correct the connections. Turn on the unit when the power supply is good.

Indoor main PCB is defective. Replace

indoor main PCB.

YES

Is it normal?

Troubleshooting

 Page 76 

5.5 E3/F5 (Fan speed is operating outside of the normal range)

Description: When the indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will

display the failure(E3). When the outdoor fan speed registers below 200RPM or over 1500RPM for an extended period of time, the unit will stop and the LED will display the failure(F5).

Recommended parts to prepare:

• Wiring mistake

• Faulty fan assembly

• Faulty fan motor

• Faulty PCB

Troubleshooting and repair:

YES

Power off, then restart the unit after 2 minutes.

Is it within normal parameters?

Replace the fan motor

Does a problem remain?

The unit is operating normallyNO

Shut off the power supply,

Rotate

the fan by hand.

YES

Does it turn easily?

Find the cause

of the problem and

resolve it

Check the wiring of fan motor.

YES

Is it improperly wired?

Ensure proper connections

Measure the voltage for

the fan motor from the PCB.

YES

Replace the indoor/outdoor

PCB

Troubleshooting

 Page 77 

Index:

1. Indoor or Outdoor DC Fan Motor(control chip is in fan motor)

Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.

• DC motor voltage input and output (voltage: 220-240V~):

No. Color Signal Voltage

1 Red Vs/Vm 280V~380V

2 --- --- ---

3 Black GND 0V

4 White Vcc 14-17.5V

5 Yellow Vsp 0~5.6V

6 Blue FG 14-17.5V

2. Indoor AC Fan Motor

Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply) or 50V(115V power supply), the PCB must has problems and need to be replaced.

Troubleshooting

 Page 78 

5.6 E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis and solution)

Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Recommended parts to prepare:

• Wiring mistake

• Faulty sensor

• Faulty PCB

Troubleshooting and repair:

Check the connection between

temperature sensor and PCB.

Replace indoor or outdoor PCB

Is it within acceptable

parameters?

Is it properly wired?

Ensure proper connections.

Measure the resistance value

of the sensor.

YES

Replace the Sensor.

YES

Troubleshooting

 Page 79 

5.7 E7 (Indoor PCB /Display board communication error)

Description: Indoor PCB does not receive feedback from Display board for 120 seconds.

Recommended parts to prepare:

• Wiring mistake

• Faulty PCB

• Display board malfunction

Troubleshooting and repair:

Power off,

then restart the unit

2 minutes later.

Is it still displaying

the error code?

Check the wirings and

connection.

YES

The unit is operating normally.

Are all the

connections

good?

Correct the connection or replace the Wirings.

Replace the indoor main

PCB.

YES

Is the error

extinguished?

Replace the Display board.

Troubleshooting

 Page 80 

5.8 EC (Refrigerant Leakage Detection diagnosis and solution)

Description: Deﬁne the evaporator coil temp.T2 of the compressor just starts running as Tcool.

In the beginning 8 minutes after the compressor starts up, if T2<Tcool-1°C does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation happens 3 times, the display area will show “EC” and AC will turn off.

Recommended parts to prepare:

• Faulty T2 sensor

• Faulty indoor PCB

• System problems, such as leakage or blockages

Troubleshooting and repair:

Power off, then restart the unit 2 minutes later.

Are any leakages

present?

Check System for blockages

and

clear

blockages if present.

Does a problem remain?

Put your hands in front of the

indoor air outlet.

YES

Is there cool

air blowing out from

indoor air outlet?

securely

attached?

Replace the

indoor PCB

YES

Check the T2 sensor.

YES

Check system for leakages.

Repair the leakage and

recharge the refrigerant.

YES

Troubleshooting

 Page 81 

5.9 F0(Overload current protection diagnosis and solution)

Description: An abnormal current rise is detected by checking the specified current detection circuit.

Recommended parts to prepare:

• Power supply problems.

• System blockage

• Faulty PCB

• Wiring mistake

• Compressor malfunction

Troubleshooting and repair:

Check the power supply.

Do any exist?

Are they within acceptable

parameters?

Are they properly connected?

Is it in working order?

Replace the outdoor unit.

Is it in working order?

Check system for blockages.

YES

Stop the unit.

Clear the blockage.

Check the compressor resistance values.

YES

Replace the compressor.

Check the connections and wires.

YES

Ensure proper connections or

replace the wires.

Check the reactor.

YES

Replace outdoor PCB.

Troubleshooting

 Page 82 

5.10 P0(IPM malfunction or IGBT over-strong current protection diagnosis and solution)

Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows

“P0” and the AC turn off.

Recommended parts to prepare:

• Wiring mistake

• IPM malfunction

• Faulty outdoor fan assembly

• Compressor malfunction

• Faulty outdoor PCB

Troubleshooting and repair:

Check the wiring between

PCB and compressor.

Does an error exist?

Ensure proper connections

replace the wires and connectors.

YES

Check the IPM.

Is it in working order?

Replace the IPM board or replace the outdoor PCB.

Check the outdoor fan and the

outdoor unit ventilation.

YES

Is it in working order?

Please refer to the solution of

the “

Fan

Speed is Out of Control”malfunction.

Check the compressor

resistance values.

YES

Are they within

acceptable parameters?

Replace the compressor.

Replace the outdoor PCB.

YES

Troubleshooting

 Page 83 

5.11 P1(Over voltage or too low voltage protection diagnosis and solution)

Description: Abnormal increases or decreases in voltage are detected by checking the speciﬁed voltage detection circuit.

Recommended parts to prepare:

• Power supply issues

• System leakage or blockage

• Faulty PCB

Troubleshooting and repair:

Check the power supply

Is it in working order?

Turn off the unit.

Check the connections and wires.

YES

Are they in working order?

Ensure proper connections or

replace the wires.

Power on and measure the

voltage between P and N.

YES

While the unit is in standby, is the voltage between P and N is around DC 310V, 340V or 380V? When start up

the unit, is it in 220V~400V?

Replace the IPM board.

Check the reactor.

YES

Is it in working order?

Replace outdoor PCB.NO

Replace the reactor.

YES

Troubleshooting

 Page 84 

5.12 P2(High temperature protection of IPM module diagnosis and solution)

Description: If the temperature of IPM module is higher than setting value, the LED displays this failure code.

Recommended parts to prepare:

• Faulty PCB

• Connection problems

Troubleshooting and repair:

Check the fastening screws on the

PCB and IPM radiator.

Are they

fixed tightly?

Replace the outdoor

control PCB.

Tighten the screws and apply

silicon grease.

YES

Troubleshooting

 Page 85 

5.13 P4(Inverter compressor drive error diagnosis and solution)

Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication

signal detection, voltage detection, compressor rotation speed signal detection and so on.

Recommended parts to prepare:

• Wiring mistake

• IPM malfunction

• Faulty outdoor fan assembly

• Compressor malfunction

• Faulty outdoor PCB

Troubleshooting and repair:

Check the wiring between the

PCB and compressor.

Is it improperly wired?

Ensure proper connections or replace

the wires and connectors.

YES

Check the IPM.

Is it functioning

properly?

Replace the IPM board or

replace the outdoor PCB.

Check the outdoor fan and

the outdoor unit ventilation.

YES

Is it functioning

properly?

Please refer to “Fan

Speed Malfunction”

Check the compressor

resistance values.

YES

Are they within

acceptable parameters?

Replace the compressor.NO

Replace the outdoor PCB.

YES

Contents

i) Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ....87

ii) Temperature Sensor Resistance Value Table for TP (°C – K)..............................88

iii) Pressure On Service Port .....................................................................................89

Appendix

 Page 87 

Appendix

i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K)

°C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm

-20 -4 115.266 20 68 12.6431 60 140 2.35774 100 212 0.62973

-19 -2 108.146 21 70 12.0561 61 142 2.27249 101 214 0.61148

-18 0 101.517 22 72 11.5 62 144 2.19073 102 216 0.59386

-17 1 96.3423 23 73 10.9731 63 145 2.11241 103 217 0.57683

-16 3 89.5865 24 75 10.4736 64 147 2.03732 104 219 0.56038

-15 5 84.219 25 77 10 65 149 1.96532 105 221 0.54448

-14 7 79.311 26 79 9.55074 66 151 1.89627 106 223 0.52912

-13 9 74.536 27 81 9.12445 67 153 1.83003 107 225 0.51426

-12 10 70.1698 28 82 8.71983 68 154 1.76647 108 226 0.49989

-11 12 66.0898 29 84 8.33566 69 156 1.70547 109 228 0.486

-10 14 62.2756 30 86 7.97078 70 158 1.64691 110 230 0.47256

-9 16 58.7079 31 88 7.62411 71 160 1.59068 111 232 0.45957

-8 18 56.3694 32 90 7.29464 72 162 1.53668 112 234 0.44699

-7 19 52.2438 33 91 6.98142 73 163 1.48481 113 235 0.43482

-6 21 49.3161 34 93 6.68355 74 165 1.43498 114 237 0.42304

-5 23 46.5725 35 95 6.40021 75 167 1.38703 115 239 0.41164

-4 25 44 36 97 6.13059 76 169 1.34105 116 241 0.4006

-3 27 41.5878 37 99 5.87359 77 171 1.29078 117 243 0.38991

-2 28 39.8239 38 100 5.62961 78 172 1.25423 118 244 0.37956

-1 30 37.1988 39 102 5.39689 79 174 1.2133 119 246 0.36954

0 32 35.2024 40 104 5.17519 80 176 1.17393 120 248 0.35982

1 34 33.3269 41 106 4.96392 81 178 1.13604 121 250 0.35042

2 36 31.5635 42 108 4.76253 82 180 1.09958 122 252 0.3413

3 37 29.9058 43 109 4.5705 83 181 1.06448 123 253 0.33246

4 39 28.3459 44 111 4.38736 84 183 1.03069 124 255 0.3239

5 41 26.8778 45 113 4.21263 85 185 0.99815 125 257 0.31559

6 43 25.4954 46 115 4.04589 86 187 0.96681 126 259 0.30754

7 45 24.1932 47 117 3.88673 87 189 0.93662 127 261 0.29974

8 46 22.5662 48 118 3.73476 88 190 0.90753 128 262 0.29216

9 48 21.8094 49 120 3.58962 89 192 0.8795 129 264 0.28482

10 50 20.7184 50 122 3.45097 90 194 0.85248 130 266 0.2777

11 52 19.6891 51 124 3.31847 91 196 0.82643 131 268 0.27078

12 54 18.7177 52 126 3.19183 92 198 0.80132 132 270 0.26408

13 55 17.8005 53 127 3.07075 93 199 0.77709 133 271 0.25757

14 57 16.9341 54 129 2.95896 94 201 0.75373 134 273 0.25125

15 59 16.1156 55 131 2.84421 95 203 0.73119 135 275 0.24512

16 61 15.3418 56 133 2.73823 96 205 0.70944 136 277 0.23916

17 63 14.6181 57 135 2.63682 97 207 0.68844 137 279 0.23338

18 64 13.918 58 136 2.53973 98 208 0.66818 138 280 0.22776

19 66 13.2631 59 138 2.44677 99 210 0.64862 139 282 0.22231

 Page 88 

Appendix

ii) Temperature Sensor Resistance Value Table for TP (°C – K)

°C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm

-20 -4 542.7 20 68 68.66 60 140 13.59 100 212 3.702

-19 -2 511.9 21 70 65.62 61 142 13.11 101 214 3.595

-18 0 483 22 72 62.73 62 144 12.65 102 216 3.492

-17 1 455.9 23 73 59.98 63 145 12.21 103 217 3.392

-16 3 430.5 24 75 57.37 64 147 11.79 104 219 3.296

-15 5 406.7 25 77 54.89 65 149 11.38 105 221 3.203

-14 7 384.3 26 79 52.53 66 151 10.99 106 223 3.113

-13 9 363.3 27 81 50.28 67 153 10.61 107 225 3.025

-12 10 343.6 28 82 48.14 68 154 10.25 108 226 2.941

-11 12 325.1 29 84 46.11 69 156 9.902 109 228 2.86

-10 14 307.7 30 86 44.17 70 158 9.569 110 230 2.781

-9 16 291.3 31 88 42.33 71 160 9.248 111 232 2.704

-8 18 275.9 32 90 40.57 72 162 8.94 112 234 2.63

-7 19 261.4 33 91 38.89 73 163 8.643 113 235 2.559

-6 21 247.8 34 93 37.3 74 165 8.358 114 237 2.489

-5 23 234.9 35 95 35.78 75 167 8.084 115 239 2.422

-4 25 222.8 36 97 34.32 76 169 7.82 116 241 2.357

-3 27 211.4 37 99 32.94 77 171 7.566 117 243 2.294

-2 28 200.7 38 100 31.62 78 172 7.321 118 244 2.233

-1 30 190.5 39 102 30.36 79 174 7.086 119 246 2.174

0 32 180.9 40 104 29.15 80 176 6.859 120 248 2.117

1 34 171.9 41 106 28 81 178 6.641 121 250 2.061

2 36 163.3 42 108 26.9 82 180 6.43 122 252 2.007

3 37 155.2 43 109 25.86 83 181 6.228 123 253 1.955

4 39 147.6 44 111 24.85 84 183 6.033 124 255 1.905

5 41 140.4 45 113 23.89 85 185 5.844 125 257 1.856

6 43 133.5 46 115 22.89 86 187 5.663 126 259 1.808

7 45 127.1 47 117 22.1 87 189 5.488 127 261 1.762

8 46 121 48 118 21.26 88 190 5.32 128 262 1.717

9 48 115.2 49 120 20.46 89 192 5.157 129 264 1.674

10 50 109.8 50 122 19.69 90 194 5 130 266 1.632

11 52 104.6 51 124 18.96 91 196 4.849 　　　

12 54 99.69 52 126 18.26 92 198 4.703 　　　

13 55 95.05 53 127 17.58 93 199 4.562 　　　

14 57 90.66 54 129 16.94 94 201 4.426 　　　

15 59 86.49 55 131 16.32 95 203 4.294 　　　

16 61 82.54 56 133 15.73 96 205 4.167 　　　

17 63 78.79 57 135 15.16 97 207 4.045 　　　

18 64 75.24 58 136 14.62 98 208 3.927 　　　

19 66 71.86 59 138 14.09 99 210 3.812 　　　

 Page 89 

Appendix

iii) Pressure On Service Port(R32)

Cooling chart:

°F(°C)

ODT

IDT

0(-17) 5(-15)

(9.44)

(7.22)

(23.89)

(29.44)

95 (35)

105

(40.56)

115

(46.11)

120

(48.89)

BAR 70/59 6.5 6.6 7.4 8.2 8.4 8.0 8.3 8.8 10.3 10.8

BAR 75/63 6.8 6.9 8.1 8.8 8.8 8.5 8.9 9.3 10.9 11.4

BAR 80/67 7.2 7.3 8.7 9.7 9.5 9.1 9.3 9.8 11.4 12.1

BAR 90/73 7.9 8.0 9.8 10.7 10.5 9.7 10.2 10.8 12.6 13.3

°F(°C)

ODT

IDT

0(-17) 5(-15)

(9.44)

(7.22)

(23.89)

(29.44)

95 (35)

105

(40.56)

115

(46.11)

120

(48.89)

PSI 70/59 95 96 108 118 121 115 119 128 150 157

PSI 75/63 99 101 117 128 126 122 129 135 158 165

PSI 80/67 105 106 125 141 138 132 135 143 165 176

PSI 90/73 114 115 142 155 152 141 148 157 184 193

°F(°C)

ODT

IDT

0(-17) 5(-15)

(9.44)

(7.22)

(23.89)

(29.44)

95 (35)

105

(40.56)

115

(46.11)

120

(48.89)

MPA 70/59 0.65 0.66 0.74 0.82 0.84 0.80 0.83 0.88 1.03 1.08

MPA 75/63 0.68 0.69 0.81 0.88 0.88 0.85 0.89 0.93 1.09 1.14

MPA 80/67 0.72 0.73 0.87 0.97 0.95 0.91 0.93 0.98 1.14 1.21

MPA 90/73 0.79 0.80 0.98 1.07 1.05 0.97 1.02 1.08 1.26 1.33

0.2

0.4

0.6

0.8

1.2

1.4

70/59

75/63

80/67

90/73

 Page 90 

Appendix

Heating chart:

°F(°C)

ODT

IDT

57/53

(13.89/11.67)

47/43

(8.33/6.11)

37/33

(2.78/0.56)

27/23

(-2.78/-5)

17/13 (-8.33/

-10.56)

0/-2(-17/-19)

-17/-18

(-27/-28)

BAR 55 30.9 29.1 25.8 23.3 21.2 18.9 16.8

BAR 65 33.2 30.6 27.1 25.9 23.8 20.9 19.4

BAR 75 34.5 32.1 28.4 26.8 25.4 21.9 20.4

°F(°C)

ODT

IDT

57/53

(13.89/11.67)

47/43

(8.33/6.11)

37/33

(2.78/0.56)

27/23

(-2.78/-5)

17/13 (-8.33/

-10.56)

0/-2(-17/-19)

-17/-18

(-27/-28)

PSI 55 448 421 374 337 308 273 244

PSI 65 480 444 394 375 346 303 282

PSI 75 499 466 411 389 369 318 296

°F(°C)

ODT

IDT

57/53

(13.89/11.67)

47/43

(8.33/6.11)

37/33

(2.78/0.56)

27/23

(-2.78/-5)

17/13 (-8.33/

-10.56)

0/-2(-17/-19)

-17/-18

(-27/-28)

MPA 55 3.09 2.91 2.58 2.33 2.12 1.89 1.68

MPA 65 3.32 3.06 2.71 2.59 2.38 2.09 1.94

MPA 75 3.45 3.21 2.84 2.68 2.54 2.19 2.04

0.5

1.5

2.5

3.5

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