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LG LMU187HV manual

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Table of contents for the manual

  • 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. Internal Use Only http://biz.lgservice.com[...]

  • Page 2

    - 1 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Air Conditioner Service Manual CONTENTS Part 1 General Information .........................................................................................................2 1. Safety Precautions .............................[...]

  • Page 3

    - 2 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. Safety Precautions ............................................................................................................3 2. Model Line Up ............................................................................[...]

  • Page 4

    Part 1 General Information - 3 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. Safety Precautions 1.1 Cautions in Repair To prevent injury to the user or other people and property damage, the following instructions must be followed. ■ Incorrect operation due to ignoring i[...]

  • Page 5

    Part 1 General Information - 4 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Do not turn on the breaker under condition that front panel and cabinet are removed. Be sure to earth the air conditioner with an earthing conductor connected to the earthing terminal. Conduct repai[...]

  • Page 6

    Part 1 General Information - 5 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1.2 Inspections after Repair Check to see if the parts are mounted correctly and wires are connected. Improper installation and connections can cause an electric shock or an injury . Check the insta[...]

  • Page 7

    2. Model Line Up Part 1 General Information - 6 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.1 Indoor units 2.64 (9) 5.28 (18) 3.52 (12) ART COOL Category Type LIBERO Model names Capacity, kW(kBtu/h Class) Chassis Wall mounted Ceiling cassette SB SC SE S8 TR TQ AMNW09GDBL[...]

  • Page 8

    Part 1 General Information 3. Nomenclature 3.1 Indoor Unit(Global) 3.2 Outdoor Unit(Global) AMN W G 09 E DL 0 Serial number A2U W 3 18 F A 0 Electrical rating Indicates that this is multi system indoor unit using R410A Model type H : Heat pump W : DC Inverter heat pump Ex) 7,000 Btu/h Class → '07', 18,000 Btu/h Class → '18' [...]

  • Page 9

    - 8 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 1. List of Functions & Controls ..........................................................................................9 2. Air flow .....................................................[...]

  • Page 10

    - 9 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 1. List of Functions & Controls 1.1 Description of Functions/Controls Auto swing (left & right) Optional Auto swing (up & down) Optional Chaos swing (up & down) Optional Airflow[...]

  • Page 11

    Network Solution (LGAP) Optional PDI (Power Distribution Indicator) Optional PI 485 Optional Zone control Optional Low ambient operation Space Control Optional Auto Elevation Optional Defrost / Deicing High pressure switch Optional Low pressure switch Optional Phase protection Optional Restart delay Optional (3-minutes) Self diagnosis Soft start Op[...]

  • Page 12

    - 11 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls * Some of functions are slightly different depending upon models, refer individual function table on "PART 2. indoor units". ** For ceiling concealed duct models, auto-run function o[...]

  • Page 13

    - 12 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 2. Air flow 2.1 Auto swing (left & right) Right Left 110 ° ~ 120 ° Open Close 110 ° ~ 120 ° Mode2 Mode3 Mode4 Mode5 Mode6 Mode7 Mode8 Mode9 OPEN CLOSED 7~8 ° 110~120 ° • By the hor[...]

  • Page 14

    - 13 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 2.4 Air flow step • Indoor fan motor control have 6 steps. • Air volume is controlled "SH", "H", "Med", Low" by remote controller. • "LL" ste[...]

  • Page 15

    - 14 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 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 d[...]

  • Page 16

    - 15 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 4.1 External pressure setting for 4. Installation Functions (E.S.P . Control) provide required constant air flow rate irrespective of E.S.P . charge. (1) Open the rear cover of the wired remot[...]

  • Page 17

    - 16 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 4.2 How to Set E.S.P? Out door Room Temp Total on Central Run Defrost Preheat PQRCUCS0C FAN SPEED MODE Lo Med 100 Setting the Low wind to 210 Setting the Medium wind to 175 TEMP TEMP This Func[...]

  • Page 18

    - 17 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls [ Notes ] 1. To get the desired Airflow & E.S.P. combination from the table set the matching value from the table. Value other than that in table will not give the combinations of airflow [...]

  • Page 19

    - 18 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 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[...]

  • Page 20

    - 19 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6. Convenience Functions & Controls 6.1 Auto cleaning operation • Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor. • Used after the Cooling Operatio[...]

  • Page 21

    - 20 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6.2 Auto Operation (Fuzzy Operation) • When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since the operation off, the operation mode is sele[...]

  • Page 22

    - 21 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6.2.3 Fuzzy Operation for Heating • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3.5°F(3°C) or more above the setting temp, the compressor is tu[...]

  • Page 23

    - 22 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6.4 Child Lock Function 6.5 Forced operation • To operate the appliance by force in case when the remote control is lost, the forced operation selection switch is on the main unit of the app[...]

  • Page 24

    - 23 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 6.6 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[...]

  • Page 25

    - 24 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3. Control logic 1. Compressor .................................................................................................................. ....25 2. Step(frequency) control ............................................[...]

  • Page 26

    - 25 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 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 co[...]

  • Page 27

    Part 3 Control logic - 26 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.1 Frequency control Frequency that corresponds to each rooms capacity will be determined according to the difference in the temperature of each room and the temperature set by the remote controller. Th[...]

  • Page 28

    Part 3 Control logic - 27 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. At the starting (outdoor is powered on,indoor is not) reversing valve continues OFF(cooling). 2. For the cooling and defrosting operation :valve OFF, for the heating operation :valve ON 3. Method of c[...]

  • Page 29

    Part 3 Control logic - 28 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1) There can be two situations a) Sensor is failed (error code for sensor failure will be generated) b) Abnormal high temperature discharge temperature (error code for high discharge will be generated) B[...]

  • Page 30

    - 29 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 5.1 Function Controlling total current to protect power semiconductor devices from burn-out by the low current (including connecting mistake) and over current. Operating process 1. Detection : check the [...]

  • Page 31

    - 30 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 6.1 Function Working of outdoor fan are different in different models. Some models are single fan some are two fan type. 6.2 Operating process Control logic of outdoor fan depends on outdoor temperature [...]

  • Page 32

    - 31 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 7.1 Function :These are about the control of compressor, fan of outdoor unit, reversing valve, LEV. 7.2 Starting to the defrosting operation A) Defrost operation will be start when all the conditions bel[...]

  • Page 33

    - 32 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 8.1 Control of LEV opening 1. LEV openings have a controllable ranges 70 (option) to 460 (option) pulse in both condition of cooling and heating. 2. Products do not be operated before initializing of LEV[...]

  • Page 34

    - 33 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 8.2 Starting control 1) Only 1 LEV will be operate as below and others are closed fully. 2) Starting control does not use the time when the system operate with partial load after (example) after finishin[...]

  • Page 35

    - 34 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1) When the accumulated compressor running time is over 3 hr.(option), oil restoring operation is made for 3 minutes. If itʼs on the way of compressor starting,itʼs made after the starting. 2) Accumula[...]

  • Page 36

    - 35 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1 1.1 Function : Power module failure protection by checking the temperature of heat sink. There is a temperature sensor for checking the heat sink temperature. 1 1.2 Heat sink sensor failure error Short[...]

  • Page 37

    - 36 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run 1. Check before T est Run .....................................................................................................37 2. T est Run Flow chart .........................................................[...]

  • Page 38

    - 37 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est 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 c[...]

  • Page 39

    - 38 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run Is cold air discharged for more than 3 minutes ? START Test operation for indoor unit Operation mode change to Heating mode Operate the unit in cooling mode. Does Test operation start? Refer to part4, 6 Electric[...]

  • Page 40

    - 39 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run 3. T est Runing 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 ou[...]

  • Page 41

    - 40 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 1. Self-diagnosis Function .................................................................................................41 2. Pump Down ...............................................................[...]

  • Page 42

    - 41 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 1. Self-diagnosis Function 1.1 Error Indicator (Indoor) Ceiling Cassette T ype Display The number of times to blink = Error code 10 degrees 1 degrees Display ed No . = Error code Standard/Artcool Mirror [...]

  • Page 43

    - 42 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 1.3 Error Indicator (Outdoor) Outdoor Error Ex) Error 21 (DC Peack) 1 Time 1 Time 1 Time 2 Times 2 Times 2 Times 1 Sec. 2 Sec. 2 Sec. 1 Sec. 1 Sec. LED01G (RED) LED02G (GREEN) Error Contents LED01G/M LED[...]

  • Page 44

    - 43 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the open position. – Remove the valve stem caps and confirm that the valve stems are in the raised position. – Be sure to use[...]

  • Page 45

    - 44 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward 0.8Torr. (3) Close the[...]

  • Page 46

    - 45 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Lo Charging cylinder Outdoor unit Indoor unit Liquid side Gas side Open 3-Way valve 3-Way valve OPEN Open Check valve (1) Vacuum Gage • Procedure (1) Connect the charge hose to the charging cylinder. ?[...]

  • Page 47

    - 46 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting T rouble 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 Current : less th[...]

  • Page 48

    - 47 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.1 The Product doesn ’ t operate at all The operation check of the Indoor P.C.B. Ass'y Procedure 1) The input voltage of power mod- ule. 2) The output voltage of power mod- ule. 4) IC04D(7805) 5)[...]

  • Page 49

    - 48 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.2 The Product doesn't operate with the remote controller Turn on the main power Yes No A "Beeping" sound is made from the indoor unit * Refer to 10.1 * Check the voltage of power (AC230V[...]

  • Page 50

    - 49 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Turn on the main power. When in air circulation mode, compressor/outdoor fan is stopped. Turn off main power. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wi[...]

  • Page 51

    - 50 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.4 When indoor Fan does not operate. Check the SSR high speed operation by remote control. (the Indoor Fan Motor is connected) Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. C[...]

  • Page 52

    - 51 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting • 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 • Check the conne[...]

  • Page 53

    - 52 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.6 T roubleshooting Indoor Error Ω 10k Ω Check the resistance Check the voltage V 2.5Vdc 01 02 06 Indoor air sensor Indoor inlet pipe sensor Indoor outlet pipe sensor • Open / Short • Soldered poo[...]

  • Page 54

    - 53 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Check the Volt. Indoor Unit V 12Vdc 12V S GND Check the Volt. Wired R/C V 12Vdc 12V S GND CN-REMO 03 Communication Wired R/C • Open / Short • Wrong connection • Connection of wire • Main PCB Volt[...]

  • Page 55

    - 54 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Check the resistance Ω 0 Ω CN Float CN-Float CN-D/PUMP 04 Drain pump / Float switch • Float switch Open. (Normal : short) • The connection of wire(Drain pump/ Float switch) • Drain pump power inp[...]

  • Page 56

    5. T rouble Shooting - 55 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 07 Different Operation Mode • One of Indoor Unit oper- ate cooling Another Unit operate heating • At the same time, this model cannot use cool and heating mode Display code Title Cause of error Check[...]

  • Page 57

    5. T rouble Shooting - 56 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 09 Indoor EEPROM Check Sum Error • Check sum error 1. Check the poor soldering 2. Check the insertion condition of the EEPROM 3. Check the PCB Connection Display code Title Cause of error Check point &[...]

  • Page 58

    5. T rouble Shooting - 57 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 10 Indoor BLDC Fan Motor Lock The Fan is not operated properly Check the Indoor fan locking Display code Title Cause of error Check point & Normal condition Check Point Check the PCB during the Power[...]

  • Page 59

    5. T rouble Shooting - 58 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 05 / 53 Title Communication (Indoor → Outdoor) • Communication poorly • Power input AC 230V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misco[...]

  • Page 60

    5. T rouble Shooting - 59 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 21 DC PEAK (IPM Fault) • Instant over current • Over Rated current • Poor insulation of IPM • An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over lo[...]

  • Page 61

    5. T rouble Shooting - 60 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only LED02M LED02M U,V,W CONNECTOR LED01M LED01M U V W U V W LED02M LED01M CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned[...]

  • Page 62

    5. T rouble Shooting - 61 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 22 Max. C/T Input Over Current(18k- 13A ↑, 24k/36k-20A ↑ ) 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... Display code Title Cause of er[...]

  • Page 63

    5. T rouble Shooting - 62 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the power source.(220V ±15%) 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 the CT Se[...]

  • Page 64

    5. T rouble Shooting - 63 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 23 DC Link Low voltage • DC Link volt is below 140Vdc • Check point & Normal condition • Check theCN_(L),CN_(N) Connection. • At not operating : DC Link voltage(280V ↑ ) • At Comp operati[...]

  • Page 65

    5. T rouble Shooting - 64 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram) 2. Check the DC Link voltage at not operating(280V ↑ ) 3. Check the DC Link voltage at Comp[...]

  • Page 66

    5. T rouble Shooting - 65 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 24 Press S/W Open • Low / High press S/W open. • Check the connection CN_L/PRESS,H/PRESS • Check the components. Display code Title Cause of error Check point & Normal condition Is high pressur[...]

  • Page 67

    5. T rouble Shooting - 66 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the connection of H/press switch 2. Check short or not at the connector of high pressure switch (Normal open) < Main PCB : Connection Check P oint > < Checking the Press s w[...]

  • Page 68

    5. T rouble Shooting - 67 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) 25 Input voltage • Abnormal Input voltage (140Vac , 300Vac) • Check the power s[...]

  • Page 69

    5. T rouble Shooting - 68 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only GND INPUT(V) < Inv er ter PCB> < Input V oltage Sensing Check P oint > Vdc[...]

  • Page 70

    5. T rouble Shooting - 69 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 26 DC Compressor Position • Compressor Starting fail error • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts. Display[...]

  • Page 71

    5. T rouble Shooting - 70 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 27 AC Input Instant over Current Error Inverter PCB input current is over100A(peak) for 2us 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation dama[...]

  • Page 72

    5. T rouble Shooting - 71 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only ■ Error Diagnosis and Countermeasure Flow Chart 28 Inverter DC link high voltage error Inv PCB DC link voltage supplied over 420V 1. Input voltage abnormal (L~N) 2. ODU inverter PCB damage(DC Link volt[...]

  • Page 73

    5. T rouble Shooting - 72 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the CN_(L),CN_(N) Connection condition at the Inverter PCB.(Refer to outdoor wiring diagram) 2. Check the DC Link voltage at not operating(280V ↑ ) 3. Check the DC Link voltage at [...]

  • Page 74

    5. T rouble Shooting - 73 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 29 Inverter compressor over current Inverter compressor input current is over 30A 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. over- charge) 2. Compressor damage(Insulation damage/Motor [...]

  • Page 75

    5. T rouble Shooting - 74 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only LEV Openness (Pulse) COMP Frequency (Hz) Toff(105) ° C T1(90) ° C T2(95) ° C OFF Normal OFF Control Normal Normal Normal D-Pipe temp. 32 D-pipe (Inverter) temp. high (105°C ↑ ) • Discharge sensor[...]

  • Page 76

    5. T rouble Shooting - 75 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) Is Inv er ter PCB Normal? No Replace inv er ter PCB assemb ly Is input voltage norm[...]

  • Page 77

    5. T rouble Shooting - 76 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only GND INPUT(CT) < Inv er ter PCB> < CT Sensing Check P oint > 1 2 3 Vdc 52 Transmission error between (Inverter PCB ➔ Main PCB) Main controller of Master unit of Master unit canʼt receive si[...]

  • Page 78

    5. T rouble Shooting - 77 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Ω 41 44 45 46 65 D-pipe sensor (Inverter) Air sensor Condenser Pipe sensor Suction Pipe sensor Heat sink sensor • Open / Short • Soldered poorly • Internal circuit error • Open / Short • Solde[...]

  • Page 79

    5. T rouble Shooting - 78 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 51 Over capacity • Over capacity Combination • Check the indoor unit capacity. • Check the combination table. Display code Title Cause of error Check point & Normal condition Check Point 1. Che[...]

  • Page 80

    5. T rouble Shooting - 79 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 60 Inverter PCB & Main EEPROM check sum error EEPROM Access error and Check SUM error 1. EEPROM contact defect/wrong insertion 2. Different EEPROM Version 3. ODU Inverter & Main PCB assembly dama[...]

  • Page 81

    5. T rouble Shooting - 80 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 61 Condenser pipe sensor temp. high • Condenser pipe sensor detected high temp. • Check the load condition. • Check the sensor of Condenser pipe sensor. Display code Title Cause of error Check poin[...]

  • Page 82

    5. T rouble Shooting - 81 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 62 Heatsink High error Inverter PCB heatsink temperature is over 85°C 2. ODU fan locking 3. Heatsink assembly of INV PCB assemble condi- tion abnormal 4. Defect of temperature sensing circuit part defec[...]

  • Page 83

    5. T rouble Shooting - 82 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only PFCM : Measuring resistance between No .19,20 pin 65 Heatsink High error Inverter PCB heatsink sensor is open or short 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condition abnormal 3. De[...]

  • Page 84

    5. T rouble Shooting - 83 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 67 Fan Lock Error Fan RPM is 10RPM or less for 5 sec. when ODU fan starts or 40 RPM or less after fan starting. 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condi- tion abnormal 3. Defect [...]

  • Page 85

    5. T rouble Shooting - 84 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 73 AC input instant over cur- rent error (Matter of software) Inverter PCB input power current is over 48A(peak) for 2ms 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compre[...]

  • Page 86

    5. T rouble Shooting - 85 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only < Input P ower Source Chec k P oint > < Main PCB wiring Check P oint > N N L N L[...]

  • Page 87

    P/NO : MFL63744402 NOVEMBER, 2010[...]