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LG A2UW14GFA2 Svc Manual
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LG A2UW14GFA2 Svc Manual

LG A2UW14GFA2 Svc Manual

Multi air conditioner
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CONFIDENTIAL
Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG A2UW14GFA2

  • Page 1 Multi Air Conditioner SVC MANUAL(General) MODEL : Multi-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 Air Conditioner Service Manual TABLE OF CONTENTS Part 1 General Information ......................2 1. Safety Precautions......................3 2. Model Line Up......................12 3. Nomenclature ......................16 Part 2 Functions & Controls......................21 1. List of Functions & Controls..................22 2. Air Flow ........................24 3. Air Purifying.........................26 4.
  • Page 3 Part 1 General Information 1. Safety Precautions ......................3 2. Model Line Up ........................12 3. Nomenclature........................16 - 2 -...
  • Page 4 Part 1 General Information 1. Safety Precautions Read the precautions in this manual carefully This appliance is filled with flammable refrig- before operating the unit. erant (R32) This symbol indicates that a service person- This symbol indicates that the Operation nel should be handling this equipment with Manual should be read carefully.
  • Page 5 Part 1 General Information Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock. Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc.
  • Page 6 Part 1 General Information • Refrigerant tubing shall be protected or enclosed to avoid damage. • The installation of pipe-work shall be kept to a minimum • When flared joints are reused indoors, the flare part shall be re-fabricated. • When mechanical connectors are reused indoors, sealing parts shall be renewed. •...
  • Page 7 Part 1 General Information 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.
  • Page 8 Part 1 General Information Initial safety checks shall include - Capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking. - No live electrical components and wiring are exposed While charging, recovering or purging the system. - Continuity of earth bonding Repairs to sealed components During repairs to sealed components, all electrical supplies shall be disconnected...
  • Page 9 Part 1 General Information Leak detection methods The following leak detection methods are deemed acceptable for systems contain- ing flammable refrigerants. Electronic leak detectors shall be used to detect flam- mable refrigerants, but the sensitivity may not be adequate, or may need re-cali- bration.
  • Page 10 Part 1 General Information 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 minimise the amount of refrigerant contained in them.
  • Page 11 Part 1 General Information Labelling Equipment shall be labelled stating that it has been de-commissioned and emp- tied of refrigerant. The label shall be dated and signed. Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant. Recovery When removing refrigerant from a system, either for servicing or decommission- ing, it is recommended good practice that all refrigerants are removed safely.
  • Page 12 Part 1 General Information Do not use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen deficiency. Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. 1.2 Inspections after Repair Check to see if the terminal block is not dirty or loose.
  • Page 13 Part 1 General Information 2. Model Line Up 2.1 Indoor units Model names Capacity, kW(kBtu/h) Category Type Chassis (15) (12) (18) (24) AMNW07GRBL0 AMNW09GRBL0 AMNW12GRBL0 [MS07AQ NB0] [MS09AQ NB0] [MS12AQ NB0] Libero-R AMNW18GRCL0 AMNW24GRCL0 [MS18AQ NC0] [MS24AQ NC0] Wall mounted AMNW05GEWA0 AMNW07GEWA0 AMNW09GEBA0...
  • Page 14 No.of connectable indoor units Max.5 Total capacity index of connectable 14.1 15.2 kBtu/h indoor units Power supply 1Ø, 220-240V, 50Hz Chassis - 13 - Copyright ©2016 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Part 1 General Information (1 phase) A7UW40GFA0 A8UW48GFA0 A9UW56GFA0 Heat pump [FM40AH U42] [FM48AH U32] [FM56AH U32] No.of connectable indoor units Max.7 Max.8 Max.9 Total capacity index of connectable 15.2 18.5 21.4 indoor units kBtu/h Power supply 1Ø, 220-240V, 50Hz Chassis (3 phase) A7UW42LFA0...
  • Page 16 Part 1 General Information 2.3 BD(Branch distributor) units No. of connectable indoor units Max. 2 Max. 3 Max. 4 Model name PMBD3620 PMBD3630 PMBD3640 Connectable indoor unit capacity 1.5~7.0 1.5~7.0 1.5~7.0 kBtu/h 5~24 5~24 5~24 BD unit - 15 -...
  • Page 17 Part 1 General Information 3. Nomenclature 3.1 Indoor Unit(Global) Serial number Function A : Basic, C/L : Plasma, E : Elevation grille Chassis naem(Only Multi) Look(Common Indoor) L : Basic Indoor unit type(Only Multi) A : ART COOL D : ART COOL Mirror E : Libero-E R : Libero-R T : Ceiling Cassette...
  • Page 18 Part 1 General Information 3.3 Indoor Unit(Europe) Color of front panel (MA-, MC- model) 1 : Gallery, E : Red, G : Gold, H : White Silver, R : Mirror, V : Silver, W : White Type of duct indoor (MB- model) No mark : High static pressure model L : Low static pressure model B : Built-in model...
  • Page 19 Part 1 General Information 2.5 BD units(Global) Serial number Number of connectable indoor units Max. capacity of connectable indoor units “36” mean that 5k~24k Indoor unit connected to BD unit BD : Branch distributor M : Multi system outdoor unit P : Parts - 18 -...
  • Page 20 Part 1 General Information Minimum floor area • The appliance shall be installed, operated and stored in a room with a floor area larger than the minimum area. • Use the graph of table to determine the minimum area. Amin (m Floor standing Wall mounted Ceiling mounted...
  • Page 21 Part 1 General Information Floor standing Floor location Wall mounted Wall mounted Ceiling Mounted Ceiling Mounted m (kg) Amin (m m (kg) Amin (m m (kg) Amin (m m (kg) Amin (m m (kg) Amin (m m (kg) Amin (m <...
  • Page 22 Part 2 Functions & Controls Part 2 Functions & Controls 1. List of Functions & Controls ..................22 2. Air flow ..........................24 2.1 Auto swing (left & right) ....................24 2.2 Auto swing (up & down) ....................24 2.3 Chaos swing (up/down)....................24 2.4 Air flow step.........................25 2.5 Chaos wind (auto wind)....................25 2.6 Jet Cool Mode Operation ....................25 2.7 Swirl wind Swing ......................25...
  • Page 23 Part 2 Functions & Controls 1. List of Functions & Accessory 1.1 List of Functions • Indoor Category Functions Remark Air supply outlet Airflow direction control (left & right) Airflow direction control (up & down) Auto swing (left & right) Air flow Auto swing (up &...
  • Page 24 Part 2 Functions & Controls • Outdoor Z3UW18GFA0 [MU3R19 UE0] Z3UW21GFA0 [MU3R21 UE0] Z2UW14GFA0 [MU2R15 UL0] Category Functions Z4UW24GFA0 [MU4R25 U40] Z2UW16GFA0 [MU2R17 UL0] Z4UW27GFA0 [MU4R27 U40] Z5UW30GFA0 [MU5R30 U40] Defrost / Deicing High pressure switch Low pressure switch Reliability Phase protection Restart delay (3-minutes) Self diagnosis...
  • Page 25 Part 2 Functions & Controls 2. Air flow 2.1 Auto swing (left & right) • By the horizontal airflow direction control key input, the left/right louver automatically operates with the auto swing or it is fixed to the desired direction. Left Right 110°...
  • Page 26 Part 2 Functions & Controls 2.4 Air flow step Step Discription • Indoor fan motor control have 6 steps. Very low, In heating mode • Air volume is controlled "SH", "H", "Med", Low" by remote controller. • "LL" step is selected automatically in Hot start operation. High Super high Auto...
  • Page 27 Part 2 Functions & Controls 3. Air purifying 3.1 PLASMA Air Purifying System The PLASMA Air Purifying System not only removes microscopic contaminants and dust, but also removes house mites, pollen, and pet fur to help prevent allergic diseases like asthma. This filter that can be used over and over again by simply washing with water.
  • Page 28 Part 2 Functions & Controls 4. Installation Functions 4.1 E.S.P. (External Static Pressure) Setting This function is applied to only duct type. Setting this in other cases will cause malfunction. Press button for 4 seconds to enter the installer setting mode until timer segment displays “01:01”. If pressing button repeatedly, it moves to static pressure selection menu as picture below.
  • Page 29 Part 2 Functions & Controls This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier. • If you set ESP incorrectly, the air conditioner may malfunction. •...
  • Page 30 Part 2 Functions & Controls E.S.P. setting value (reference) Static pressure(mmAq) Step(Hi/Med/Lo) Model name Setting value 8.5 CMM AMNH09GB1A2 7.5 CMM [MB09AHL N12] 6.5 CMM 9.5 CMM AMNH12GB1A2 8.5 CMM [MB12AHL N12] 7.5 CMM 15 CMM AMNH18GB2A2 13.5 CMM [MB18AHL N22] 11.5 CMM 17 CMM AMNH24GB2A2...
  • Page 31 Part 2 Functions & Controls 4.2 High Ceiling operation This function is to adjust FAN Airflow rate according to ceiling height (For ceiling type product) If pressing button long for 3 seconds, it enters into remote controller setter setup mode. - If pressing once shortly, it enters into user setup mode.
  • Page 32 Part 2 Functions & Controls 5. Reliability 5.1 Hot start • When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out • When the temp. of heat exchanger reach 30°C(model by model), indoor fan is started. 5.2 Self-diagnosis Function •...
  • Page 33 Part 2 Functions & Controls 6. Convenience Functions & Controls 6.1 Cooling & heating Operations 6.1.1 Cooling Mode • Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions. •...
  • Page 34 Part 2 Functions & Controls 6.2 Auto cleaning operation • Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor. • Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next opera- tion.
  • Page 35 Part 2 Functions & Controls 6.3.2 Fuzzy Operation for Dehumidification • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the set- ting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp ‘...
  • Page 36 Part 2 Functions & Controls 6.5 Child Lock Function It is the function to use preventing children or others from careless using. Press button repeatedly until is flashing. If moving to 'setup' icon area by using button, 'setup' icon blinks, and child lock function is setup if pressing button at that time.
  • Page 37 Part 2 Functions & Controls 6.7 Group Control 1. When installing more than 2 units of air conditioner to one wired remote controller, please connect as the right figure. • If it is not event communication indoor unit, set the unit Signal wire as slave.
  • Page 38 Part 2 Functions & Controls 6.8 Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops. • While the appliance is on pause, the sleep timer mode cannot be input. •...
  • Page 39 Part 2 Functions & Controls 6.11 Two Thermistor Control This is the function to select the temperature sensor to judge the room temperature. If pressing button long for 3 seconds, it enters into remote controller setter setup mode. - If pressing once shortly, it enters into user setup mode. Please press more than 3 seconds for sure.
  • Page 40 Part 2 Functions & Controls 7. Special Function & KIT 7.1 Low Ambient control • This Function is for cooling operating in outdoor low temperature . • If outdoor temperature drops below certain temperature, liquid back is prevented by reducing outdoor fan speed. •...
  • Page 41 Part 2 Functions & Controls n ELEVATION GRILL (REMOTE CONTROLLER_Accessory) • Main Components of Lift Grill Signal transmitter ¿ Lift grill front panel assembly ¡ Bolts for installation (4 EA, P/No. 3A00255K) ¬ Instruction manual √ Remote Controller for lift grill Ascend Descend •...
  • Page 42 Part 2 Functions & Controls • How to Operate the Lift Grill • Always stop the air conditioner operation for safety before operating lift grill. • Take heed _ there is worry about dust fall etc. when suction grill descends. •...
  • Page 43 Part 3 Basic Control 3. Basic Control 1. Normal operation......................43 2 Compressor control ......................43 3. EEV( Electronic Expansion Valve) control ..............43 4. Oil return control ......................44 5. Defrost control .........................44 6. Protection control ......................45 6.1 High pressure protection control ................45 6.2 Low pressure protection control ................45 6.3 Discharge temperature control ................45 6.4 Input Current control ...................45...
  • Page 44 Part 3 Basic Control 1. Normal operation Basic principle is to control the rpm of the motor by changing the working frequency of the compressor. Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM (intelligent power module).
  • Page 45 Part 3 Basic Control 4. Oil return control Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe. Each cycle component operates as shown on the below table during oil return operation. Outdoor unit Component Starting Running Ending Compressor...
  • Page 46 Part 3 Basic Control 6. Protection control 6.1 High pressure protection control Pressure range Compressor Pd ≥ 4069 kPa 3938 kPa ≤ Pd < 4069 kPa 3Hz down 3840 kPa ≤ Pd < 3938 kPa 3Hz down 3709 kPa ≤ Pd < 3840 kPa Frequency holding 3611 kPa ≤...
  • Page 47 4. Test Run 4. Test Run 1. Check before Test Run.....................47 2. Test Run Flow chart ......................48 3. Test Running ........................49 - 46 -...
  • Page 48 4. Test Run 1. Check before Test Run Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. Check liquid pipe and gas pipe valves are fully opened. NOTE: Be sure to tighten caps. Confirm that 500 V megger shows 2.0 MΩ...
  • Page 49 4. Test Run 2. Test Run Flow chart START Test operation for indoor unit Operate the unit in cooling mode. Refer to part4, 6 Electric part Does Test operation start? Is cold air discharged for more than 3 minutes ? Refer to part4, 5 Cycle part Is there any temperature difference between intake and...
  • Page 50 4. Test Run 3. Test Running 3.1 SPLIT, ART cool, ART cool deluxe Type • Check that all tubing and wiring have been properly con- Bolt nected. • Check that the gas and liquid side service valves are fully open. 3.1.1 Prepare remote controller ❶...
  • Page 51 4. Test Run 3.2 CVT Type 3.2.1 Connection of power supply 1) Connect the power supply cord to the independent power supply. • Circuit breaker is required. 2) Prepare the remote control. • Insert two batteries provided. Remove the battery cover from the remote controller. •...
  • Page 52 4. Test Run 3.3 Ceiling Cassette Type 3.3.1 PRECAUTIONS IN TEST RUN • The initial power supply must provide at least 90% of the rated voltage. Otherwise, the air conditioner should not be operated. CAUTION: ① For test run, carry out the cooling operation first even during winter season. If heating operation is carried out first, it leads to the trouble of compressor.
  • Page 53 5. Trouble Shooting 5. Trouble Shooting 1. Self-diagnosis Function....................53 1.1 Error Indicator (Indoor)....................53 2. Pump Down........................55 2.1 14k/16k........................55 2.2 18k~56k ........................56 3. Evacuation ........................57 4. Gas Charging ........................58 5. Cycle Part ........................59 6. Electronic Parts ......................60 6.1 The Product doesn t operate at all ................60 6.2 The Product doesn't operate with the remote controller ..........61 6.3 The Compressor/Outdoor Fan are don't operate ............62 6.4 When indoor Fan does not operate................63...
  • Page 54 5. Trouble Shooting 1. Self-diagnosis Function 1.1 Error Indicator (Indoor) Ceiling Cassette Type Display 10 degrees 1 degrees The number of times to blink = Error code Standard Libero Type Display Libero-R Libero-E Artcool Mirror Cooling Cooling 1 degrees 1 degrees Heating Heating 10 degrees...
  • Page 55 5. Trouble Shooting 1.3 Error Indicator (Outdoor) Outdoor Error Ex) Error 21 (DC Peack) 2 Times 2 Times 2 Times LED01G (RED) 1 second 1 second 1 second 1 Time 1 Time 1 Time LED02G (GREEN) 2 second 2 second Error LED01G/M LED02G/M...
  • Page 56 5. Trouble Shooting 2. Pump Down 2.1 14k/16k Liquid side Indoor unit Open Outdoor unit 2-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (1) Confirm that both the 2-way and 3-way valves (6) Operate the air conditioner at the cooling are set to the open position.
  • Page 57 5. Trouble Shooting 2.2 18k~56k This function gathers the refrigerant present in the system to ODU Use this function to store refrigerant of system in ODU for leakage or IDU replacement. • Procedure n This function start Dip switch setting status of ODU PCB. (1) Set the Dip switch as follow after shutting the power source down.
  • Page 58 5. Trouble Shooting 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump Vacuum Gage OPEN OPEN • Procedure (1) Connect the vacuum pump to the center hose (4) Disconnect the charge hose from the vacuum of charge set center hose pump.
  • Page 59 5. Trouble Shooting 4. Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 3-Way valve Gas side Open 3-Way valve Check valve Charging cylinder Vacuum Gage OPEN • Procedure (1) Connect the charge hose to the charging This is different from previous procedures. cylinder.
  • Page 60 5. Trouble Shooting 5. Cycle Part Trouble analysis 1. Check temperature difference between intake and discharge air, and check for the operating current too. Case Symptom Supposed Caused Temp. difference : approx. 0°C All amount of refrigerant leaked out. Case 1 Current : less than 80% of rated current Check refrigeration cycle.
  • Page 61 5. Trouble Shooting 6. Electronic Parts 6.1 The Product doesn’ t operate at all Turn off the main power and wait for 10 seconds. Turn on the main power again. Primarily, the operating condition of Micom is O.K. A "Beeping" sound is made from the indoor unit * Check, Remote controller &...
  • Page 62 5. Trouble Shooting 6.2 The Product doesn't operate with the remote controller Turn on the main power A "Beeping" sound is made * Refer to 10.1 from the indoor unit * Check the voltage of power (AC220V/AC240V, 50Hz). Is it possible to turn on the unit by ON/OFF button on display? Is the remote controller * When the mark (...
  • Page 63 5. Trouble Shooting 6.3 The Compressor/Outdoor Fan are don't operate Turn on the main power. Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped. Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.) When the sensor circuit for Indoor temperature and connector are in bad connection or are...
  • Page 64 5. Trouble Shooting 6.4 When indoor Fan does not operate. Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. of micom and the part for driving SSR.(Q01M) •...
  • Page 65 5. Trouble Shooting 6.5 When the louver does not operate. • Confirm that the vertical louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the vertical louver with hands ⇒ Normal •...
  • Page 66 5. Trouble Shooting 6.6 Troubleshooting Indoor Error Display Title Cause of error Check point & Normal condition code • Open / Short Normal resistor : 10KΩ/ at 25°C (Unplugged) Indoor air sensor • Soldered poorly Normal voltage : DC 2.5V / at 25°C (plugged) •...
  • Page 67 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Connection of wire Communication • Open / Short • Main PCB Volt. DC12V Wired R/C • Wrong connection • Noise interference Wired R/C Indoor Unit CN-REMO 12Vdc 12Vdc...
  • Page 68 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (230V) Drain pump • Float switch Open. • Drain tube installation. / Float switch (Normal : short) •...
  • Page 69 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • One of Indoor Unit oper- • At the same time, this model cannot use cool and Different Operation Mode ate cooling Another Unit heating mode operate heating Check Point 1.
  • Page 70 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Check the poor soldering Indoor EEPROM Check • Check sum error 2. Check the insertion condition of the EEPROM Sum Error 3. Check the PCB Connection <EEPROM Direction Check Point>...
  • Page 71 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code Indoor BLDC Fan Motor The Fan is not operated Check the Indoor fan locking Lock properly White Yellow Blue Black Red Fan motor connector Tester Check Point Check the PCB during the Power on 1.
  • Page 72 5. Trouble Shooting 6.7 Troubleshooting Outdoor Error ▶14/16/18/21k Display Title Cause of error Check point & Normal condition code • Compressor blocked • Check compressor constraint • Disconnection/shortcircuit • Check compressor wire open/short inside compressor High current into the • Check compressor insulation damage •...
  • Page 73 5. Trouble Shooting Table 1 Winding Resistance(Ω at 75℃) Model Terminal Inverter Comp. 1.620±7% 14k/16k/ 1.620±7% 18k/21k 1.620±7% Table 1 Resistance of terminal insulations) 1MΩ ↑ U - chassis 1MΩ ↑ V - chassis 1MΩ ↑ W - chassis [IPM Position & Pin number] - 72 -...
  • Page 74 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Input voltage error(low voltage) • Check input voltage AC Input current is higher • Over load operation • Check outdoor fan canstraint / screened / flow than the limit.
  • Page 75 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • DC Link Voltage is above 420Vdc • Check Input Voltage DC Link High / Low Volt • DC Link Voltage is below • Check PCB DC Link voltage sensor parts 140Vdc WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 76 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code Input voltage is over limited 1. Input voltage abnormal (R-S-T) Input Voltage high/low value of the product (140V 2. Outdoor unit main PCB assembly damage or less, 300V or more) (input voltage sensing part) n Error Diagnosis and Countermeasure Flow Chart Are there any power wire...
  • Page 77 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Compressor Locking • Check compressor locking • Overload operation Over-current at the initial • Compressor wire open/short (Outdoor fan constraint, operation of the compres- • Check compressor insulation damage screened, blocked) sor / location sensing sig- •...
  • Page 78 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, • Check outdoor fan constraint/ screened/ flow screened, blocked) Over-current on AC ’ DC structure • Wrong application of converter circuit •...
  • Page 79 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Compressor Locking • Check compressor locking • Overload operation Over-current at the initial • Compressor wire open/short (Outdoor fan constraint, operation of the compres- • Check compressor insulation damage screened, blocked) sor / location sensing sig- •...
  • Page 80 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint/ screened/ flow High temperature in • Refrigerant leakage structure Discharge pipe of the (insufficient) •...
  • Page 81 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Defective low pressure sensor • Defective outdoor/indoor unit fan • Refrigerant shortage/leakage • Deformation because of damage of refrigerant pipe • Defective indoor / outdoor unit EEV Excessive decrease of low Low Presser Error •...
  • Page 82 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code AC Input current / Comp phase current sensing cir- • PCB sensing circuit part • Check power input connector, Comp output cuit - basic vlotage sens- burned current sensing circuit ing error...
  • Page 83 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Open / Short • Soldered poorly D-pipe sensor (Inverter) • Normal resistor : 200KΩ / at 25°C (Unplugged) • Internal circuit error • Open / Short •...
  • Page 84 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Bad connection of connector PCB • Bad connection high pressure connector Sensor error of high Abnormal value of sensor • Defect of high pressure connector (Open/Short) pressure (Open/Short) •...
  • Page 85 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check the indoor unit capacity. Over capacity • Over capacity Combination • Check the combination table. Model Gross max.capacity Max.single indoor unit capacity Check Point •...
  • Page 86 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • No power on indoor unit • Indoor/outdoor unit • Check indoor unit power status Power connection • Check indoor/outdoor unit If the data transmitted by error/communication power/communication line disconnection the indoor unit is not...
  • Page 87 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Outdoor unit PCB Incorrect checksum of out- EEPROM misapplied EEPROM assembly door unit PCB EEPROM • Outdoor unit PCB EEPROM poor assmbly WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 88 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint / screened / flow • Outdoor unit heat structure High temperature in out- exchanger contaminated •...
  • Page 89 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • ODU fan locking • Heatsink assembly of INV PCB assemble condi- Inverter PCB heatsink tem- Heat Sink High tion abnormal perature is over 85°C • Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 90 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • ODU fan locking • Heatsink assembly of INV PCB assemble Inverter PCB heatsink sen- Heatsink Sensor error condition abnormal sor is open or short • Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 91 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • ODU fan locking Fan RPM is 10RPM or less • Heatsink assembly of INV PCB assemble condi- for 5 second when ODU fan Fan Lock Error tion abnormal starts or 40 RPM or less •...
  • Page 92 5. Trouble Shooting ▶ 24/27/30/40/48/56k Display Title Cause of error Check point & Normal condition code • An instant over current in the U,V,W phase - Comp lock • Instant over current - The abnormal connection of U,V,W DC PEAK •...
  • Page 93 5. Trouble Shooting n 24/27/30k IPM Check Point 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out V, V, W COMP connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5.
  • Page 94 5. Trouble Shooting n 40/48/56k LED01M LED02M LED01M LED01M LED01M LED02M LED02M LED02M CN(L)_BRWON CN(L)_BRWON CN(L)_BRWON CN(L)_BRWON CN(N)_BLUE CN(N)_BLUE CN(N)_BLUE CN(N)_BLUE U,V,W CONNECTOR U,V,W CONNECTOR U,V,W CONNECTOR U,V,W CONNECTOR 1. Wait until inverter PCB DC voltage is discharged after main power off. 2.
  • Page 95 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Malfunction of Compressor Input Over 2. Blocking of Pipe Max. C/T Current(27/30/40k-17A↑ 3. Low Voltage Input 36/48/56k-29A↑) 4. Refrigerant, Pipe length, Blocked... WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 96 5. Trouble Shooting Check Point 1. Check the power source.(230V ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (24/27/30k - Check output the CT Sensor : DC 2.5±0.2V) (36/40/48/56k - Check output pin 1.2 of the CT Sensor : 5V ) I_IN I_IN...
  • Page 97 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • DC Link Voltage is • Check CN_(L), CN_(N) Connection above 420Vdc DC Link High / Low Volt • Check Input Voltage • DC Link Voltage is •...
  • Page 98 5. Trouble Shooting Check Point 1. Check the REACTOR_IN and REACTOR_OUT1,2 Connection condition at the Main PCB.(Refer to outdoor wiring diagram) 2. Measure the voltage as shown in figures. 3. If the measurements are significantly different from the levels shown in the figures, the PFCM is deemed to be damaged.
  • Page 99 5. Trouble Shooting 40/48/56k < Inverter PCB> <DC Link Voltage Check Point> <Connection Check Point> DC_LINK DC_LINK DC_LINK <DC_LINK Sensing Check Point> - 98 -...
  • Page 100 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Abnormal Input voltage • Check the power source. Input voltage (140Vac , 300Vac) • Check the components. n Error Diagnosis and Countermeasure Flow Chart Is input voltage normal ? Check L~N Voltage is 230V±15% Is Inverter PCB Normal? Replace inverter PCB assembly...
  • Page 101 5. Trouble Shooting 24/27/30k INV_Cur INV_Current INV_Current 2.5V Black <CT Sensing Check Point> 40/48/56k INPUT(V) INPUT(V) < Input Voltage Sensing Check Point > < Inverter PCB> - 100 -...
  • Page 102 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check the connection of comp wire “U,V,W” DC Compressor • Compressor • Malfunction of compressor Position Starting fail error • Check the component of “IPM”, detection parts. WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 103 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor Inverter PCB input damage) AC Input Instant over current is over100A(peak) 3. Input voltage abnormal (L,N) Current Error for 2us 4.
  • Page 104 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. over- charge) Inverter compressor over Inverter compressor input 2. Compressor damage(Insulation damage/Motor current current is over 30A damage) 3. Input voltage low 4.
  • Page 105 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint/ screened/ flow High temperature in • Refrigerant leakage structure Discharge pipe of the (insufficient) •...
  • Page 106 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Defective low pressure sensor • Defective outdoor/indoor unit fan • Refrigerant shortage/leakage • Deformation because of damage of refrigerant pipe • Defective indoor / outdoor unit EEV Excessive decrease of low Low Presser Error •...
  • Page 107 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code Transmission Error Communication Error 1. Micom defect/Circuit defect Between (PFC Micom ’ 2. Different Micom S/W Version Between PFC Micom INV Micom) and INV Micom. 3. ODU inverter PCB assembly damage n Error Diagnosis and Countermeasure Flow Chart Is PFC Micom &...
  • Page 108 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Malfunction of current detection circuit. (Open / Short) • Initial current error • Check CT Sensor output voltage : Sensor Error 2.5Vdc ±5% WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 109 5. Trouble Shooting 24/27/30k INV_Cur INV_Current INV_Current 2.5V Black <CT Sensing Check Point> 40/48/56k INPUT(CT) INPUT(CT) < CT Sensing Check Point > < Inverter PCB> - 108 -...
  • Page 110 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Open / Short 1. Bad connection of thermistor connector D-pipe sensor (Inverter) • Soldered poorly 2. Defect of thermistor connector (Open/Short) • Internal circuit error 3.
  • Page 111 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Bad connection of connector PCB • Bad connection high pressure connector Sensor error of high Abnormal value of sensor • Defect of high pressure connector (Open/Short) pressure (Open/Short) •...
  • Page 112 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check the indoor unit capacity. Over capacity • Over capacity Combination • Check the combination table. Model Gross max.capacity Max.single indoor unit capacity Z4UW24GFA0 Z4UW27GFA0 Z5UW30GFA0 A5UW40GFA0 A7UW40GFA0...
  • Page 113 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Power input AC 230V. (Outdoor, Indoor) • The connector for transmission is disconnected. Title • The connecting wires are misconnected. • Communication poorly Communication • The communication line is shorted at GND. (Indoor ’...
  • Page 114 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. EEPROM contact defect/wrong insertion Inverter PCB & Main EEPROM Access error 2. Different EEPROM Version EEPROM check sum error and Check SUM error 3. ODU Inverter & Main PCB assembly damage WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 115 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint / screened / flow • Outdoor unit heat structure High temperature in out- exchanger contaminated •...
  • Page 116 5. Trouble Shooting 40/48/56k <MAIN PCB> <Inverter PCB> <EEPROM Direction Check Point> - 115 -...
  • Page 117 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condi- Inverter PCB heatsink Heatsink High error tion abnormal temperature is over 85°C 3. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 118 5. Trouble Shooting 24/27/30k 9~11KΩ PFCM : Measuring resistance Black between No.19,20 pin 40/48/56k PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 117 -...
  • Page 119 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble Inverter PCB heatsink condition abnormal Heatsink Sensor error sensor is open or short 3. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 120 5. Trouble Shooting 24/27/30k Location of SPM /PSCM /PFCM 9~11KΩ Black A: PSCM /PFCM B: SPM 40/48/56k PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 119 -...
  • Page 121 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code Fan RPM is 10RPM or 1. ODU fan locking less for 5 second when 2. Heatsink assembly of INV PCB assemble condi- ODU fan starts or 40 tion abnormal Fan Lock Error RPM or less after fan...
  • Page 122 5. Trouble Shooting 24/27/30k -. Checking wire Check voltage betwen terminals for 1pin and 4pin of fan motor possible short Fan motor connector Tester Tester 40/48/56k <Inverter PCB> - 121 -...
  • Page 123 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage AC input instant over cur- Inverter PCB input power (Insulation damage/Motor damage) rent error current is over 48A(peak) 3.
  • Page 124 5. Trouble Shooting 24/27/30k < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 123 -...
  • Page 125 5. Trouble Shooting 48/56k < Noise Filter wiring Check Point > < Noise Filter wiring Check Point > < Input Power Source Check Point > < Input Power Source Check Point > < Inverter PCB wiring Check Point > < Inverter PCB wiring Check Point > - 124 -...
  • Page 126 5. Trouble Shooting ▶A7UW42LFA0/A8UW48LFA0/A9UW56LFA0 Display Title Cause of error Check point & Normal condition code • An instant over current in the U,V,W phase - Comp lock • Instant over current - The abnormal connection of U,V,W DC PEAK • Over Rated current •...
  • Page 127 5. Trouble Shooting 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out CN-L1(R), CN-L2(S), CN-L3(T) and CN-COMP Connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5.
  • Page 128 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Malfunction of Compressor 2. Blocking of Pipe Max. C/T Input Over Current 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 129 5. Trouble Shooting Check Point 1. Check the power source.(200~240V) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (Check output pin 1.2 of the CT Sensor : 5V) Tester CT Sensor Output (at the INVERTER PCB)
  • Page 130 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check point & Normal condition • DC Link Voltage is • Check the TAB1 is connect. above 780Vdc DC Link High / Low Volt. • At not operating : DC Link voltage(260V↑) •...
  • Page 131 5. Trouble Shooting Check Point 1. Check the Tab1 connection condition. (Refer to outdoor wiring diagram) 2. Check the CN_L1(R), CN_L2(S), CN_L3(T) connection condition 3. Check the DC Link voltage at not operating(380V↑) 4. Check the DC Link voltage at Comp operating(500V↑) 5.
  • Page 132 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code Abnomal Input Voltage Check the power source. Input voltage (R,S,T -N /140Vac↓, • Check the components. 300Vac ↑) n Error Diagnosis and Countermeasure Flow Chart R~S/S~T/T~R phase voltage is 400V±10% R~N/S~N/T~N phase voltage is 220V±10% Is input voltage normal? →...
  • Page 133 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check the connection of comp wire “U,V,W” • Compressor DC Compressor • Malfunction of compressor Starting fail error Position • Check the component of “IPM”, detection parts. n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 134 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor Inverter PCB input damage) AC Input Instant over current is over100A(peak) 3. Input voltage abnormal (L,N) Current Error for 2us 4.
  • Page 135 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. over- charge) Inverter compressor over Inverter compressor input 2. Compressor damage(Insulation damage/Motor current current is over 30A damage) 3. Input voltage low 4.
  • Page 136 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint/ screened/ flow High temperature in • Refrigerant leakage structure Discharge pipe of the (insufficient) •...
  • Page 137 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Defective low pressure sensor • Defective outdoor/indoor unit fan • Refrigerant shortage/leakage • Deformation because of damage of refrigerant pipe • Defective indoor / outdoor unit EEV Excessive decrease of low Low Presser Error •...
  • Page 138 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code Transmission Error Communication Error 1. Micom defect/Circuit defect Between (PFC Micom ’ 2. Different Micom S/W Version Between PFC Micom INV Micom) and INV Micom. 3. ODU inverter PCB assembly damage n Error Diagnosis and Countermeasure Flow Chart Is PFC Micom &...
  • Page 139 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Malfunction of current detection circuit. (Open / Short) • The voltage of "C01N" Is 4.0Vdc(25A) . • Initial current error Sensor Error • Check CT Sensor output voltage : 2.5Vdc ±5% n Error Diagnosis and Countermeasure Flow Chart If the CT Sensor output is not 2.5Vdc°æ5%...
  • Page 140 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Open / Short D-pipe sensor (Inverter) • Soldered poorly • Normal resistor : 200KΩ / at 25°C (Unplugged) • Internal circuit error • Bad connection of connector PCB •...
  • Page 141 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check the indoor unit capacity. Over capacity • Over capacity • Check the combination table. • Check the PCB ASM P/No. Over capacity • Check sum error •...
  • Page 142 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. Title • The connecting wires are misconnected. • Communication poorly Communication • The communication line is shorted at GND. (Indoor ’...
  • Page 143 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • 3-phase wrong wiring of • Abnormal Main PCB 3-phase wrong wiring outdoor unit (Reverse • No connection of CN_Phase of main outdoor unit Phase /omission of •...
  • Page 144 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Condenser pipe sensor • Check the load condition. Condenser pipe sensor detected high • Check the sensor of Condenser pipe sensor. temp. high temp.(65°C) Heat sink sensor •...
  • Page 145 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble Inverter PCB heatsink condition abnormal Heatsink Sensor error sensor is open or short 3. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 146 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code • Check the fan condition. Outdoor fan • Outdoor fan is not oper- • Check the fan connector lock ating • Check the fan control part of the INVERTER PCB n Error Diagnosis and Countermeasure Flow Chart CH67(Outdoor fan lock) occurrence Is fan connector condition right ?
  • Page 147 5. Trouble Shooting Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage AC input instant over cur- Inverter PCB input power (Insulation damage/Motor damage) rent error current is over 48A(peak) 3.
  • Page 148 5. Trouble Shooting < Noise Filter wiring Check Point > < Input Power Source Check Point > < Inverter PCB wiring Check Point > - 147 -...
  • Page 149 6. Service Order Part 6 Service Order 1. PCB Service Order ......................141 - 148 -...
  • Page 150 6. Service Order 1. PCB Service Order ▶ 14/16/18/21k Hang wires up on the Rib Remove Top Cover and Take Terminals from PCB from Case and Insert PCB Control Box Cover with a tool into Control Box Remove PCB Screws (4ea) Replace New PCB Tighten PCB Screws (4ea) Raise PCB and...
  • Page 151 December, 2017 P/NO : MFL36552524...

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