LG ARNU05GL1G2 Service Manual Download Page 85

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Troubleshooting Guide

- 85 -

LGE Internal Use Only

1. Auto addressing is not done
2. Communication cable is not connected
3. Short circuit of communication cable
4. Indoor unit communication circuit fault
05 5. Outdoor unit communication circuit fault
6. Not enough distance between power and com-

munication cable?

7. T phase line disconnection or N phase connected.

Error

No.

Error Type

Error Point

Main Reasons

No signal communication
between indoor & outdoor
units.

Indoor & Outdoor unit
communication error

Does all the IDUs show
same error code CH05?

Is outdoor PCB LED

blinking?

Yes

Is main circuit breaker off?

Check the main power

supply at the ODU

terminal block?

Improper connection of power supply cable

Main power supply problem

Yes

Outdoor PCB fault
Replace after checking

Re connect communication cable

Yes

Indoor PCB fault
Replace after checking

* (Note1) communication from IDU is normal if voltage

fluctuation(-9V ~ +9V) exists when checking DC voltage
of communication terminal between IDU and ODU

Is total number of indoor

units connected displayed

after auto addressing?

END

* If the DC voltage between communication terminal A, B

of indoor unit is fluctuate within (-9V~+9V) then

communication from outdoor unit is normal

Check the insulation of compressor
compressor and replace if required

Check the capacity of main circuit
breaker and replace if required

Check T phase line connetion

If all ok,
Turn on main circuit breaker

Replace outdoor PCB after
checking

Replace TRANS after checking

Replace the PCB of indoor unit
displayed error

Re-connect after check the
communication cable of indoor
unit displayed error**

Check if the

communication cable is

properly connected

to indoor / outdoor

terminal block?*

Error diagnosis and countermeasure flow chart

Summary of Contents for ARNU05GL1G2

Page 1: ...Outdoor Unit SERVICE MANUAL 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 R410A ...

Page 2: ...LGE Internal Use Only Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions 3 Part 1 General Information 8 Model Names 9 External Appearance 11 Combination of Outdoor Units 13 Nomenclature 14 Part 2 Outdoor Units 15 Part 3 PCB Setting and Test Run 49 Part 4 Trouble shooting guide 54 ...

Page 3: ...e by a licensed electrician according to Electric Facility Engineering Standard and Interior Wire Regulations and the instructions given in this manual and always use a special circuit If the power source capacity is inadequate or electric work is performed improperly electric shock or fire may result Ask the dealer or an authorized technician to install the air conditioner Improper installation b...

Page 4: ...ettings of the protection devices If the pressure switch thermal switch or other protection device is shorted and operated forcibly or parts other than those specified by LGE are used fire or explosion may result Ventilate before operating air conditioner when gas leaked out It may cause explosion fire and burn Securely install the cover of control box and the panel If the cover and panel are not ...

Page 5: ...ch the sharp edges when installing It may cause injury Take care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage Do not open the inlet grille of the product during operation Do not touch the electro static filter if the unit is so equipped There is risk of physical injury electric shock or product failure CAUTION n Installat...

Page 6: ...on equipment may cause the air condition er to operate erroneously or fail to operate On the other hand the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting Do not install the product where it is exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins c...

Page 7: ... with a plastic bag which was not torn apart they face the risk of suffocation Turn on the power at least 6 hours before starting operation Starting operation immediately after turning on the main power switch can result in severe damage to internal parts Keep the power switch turned on during the operational season Do not touch any of the refrigerant piping during and after operation It can cause...

Page 8: ...nd service purposes LGE Internal Use Only Part 1 General Information 1 Model Names 9 1 1 Indoor Unit 9 1 2 Outdoor Unit 9 2 External Appearance 11 2 1 Indoor Unit 11 2 2 Outdoor Unit 12 3 Combination of Outdoor Units 13 4 Nomenclature 14 4 1 Indoor Unit 14 4 2 Outdoor Unit 14 ...

Page 9: ...7k 2 2 9k 2 8 12k 3 6 15k 4 5 18k 5 6 21k 6 2 24k 7 1 28k 8 2 36k 10 6 42k 12 3 48k 14 1 54k 15 8 76k 22 4 96k 28 0 Wall Mounted General S5 O O Libero SB O O O O SC O O ART COOL Mirror SE O O O O S8 O O Gallery SF O O O Ceiling Cassette 1 Way TU O O O TT O O 2 Way TL O O 4 Way TR O O O O TQ O O TP O O TN O TM O O Ceiling Concealed Duct High Static BH O O O O O O BG O O O BR O O B8 O O Low Static L...

Page 10: ...E4 260LTS4 280LTE4 280LTS4 300LTE4 300LTE4 320LTE4 320LTS4 340LTE4 340LTE4 360LTE4 360LTS4 380LTE4 380LTS4 Power Supply 40HP 42HP 44HP 46HP 48HP 50HP 52HP 54HP 3Ø 380 415V 50Hz 3Ø 380V 60Hz 400LTE4 400LTS4 420LTE4 420LTS4 440LTE4 440LTS4 460LTE4 460LTS4 480LTE4 480LTS4 500LTE4 500LTS4 520LTE4 520LTS4 540LTE4 540LTS4 Power Supply 56HP 58HP 60HP 62HP 64HP 66HP 68HP 70HP 3Ø 380 415V 50Hz 3Ø 380V 60Hz...

Page 11: ...NU12GSE 2 ARNU15GSE 2 ARNU18GS8 2 ARNU24GS8 2 ARNU09GVEA2 ARNU12GVEA2 URNU18GVJA2 URNU24GVJA2 URNU36GVKA2 URNU48GVLA2 Console ARNU07GQAA2 ARNU09GQAA2 ARNU12GQAA2 ARNU15GQAA2 Floor Standing With case ARNU07GCEA2 ARNU09GCEA2 ARNU12GCEA2 ARNU15GCEA2 ARNU18GCFA2 ARNU24GCFA2 Without case ARNU07GCEU2 ARNU09GCEU2 ARNU12GCEU2 ARNU15GCEU2 ARNU18GCFU2 ARNU24GCFU2 Ceiling Concealed Duct High Static ARNU07GBH...

Page 12: ... ARUN240LTE4 LTS4 UX3 UX2 ARUN260LTE4 LTS4 ARUN280LTE4 LTS4 ARUN300LTE4 LTS4 ARUN320LTE4 LTS4 UX3 UX3 ARUN360LTE4 LTS4 ARUN380LTE4 LTS4 ARUN340LTE4 LTS4 ARUN400LTE4 LTS4 UX3 UX3 UX2 ARUN420LTE4 LTS4 ARUN440LTE4 LTS4 ARUN460LTE4 LTS4 ARUN480LTE4 LTS4 ARUN500LTE4 LTS4 ARUN520LTE4 LTS4 UX3 UX3 UX3 ARUN540LTE4 LTS4 ARUN560LTE4 LTS4 ARUN580LTE4 LTS4 ARUN600LTE4 LTS4 UX3 UX3 UX3 UX3 ARUN620LTE4 LTS4 ARU...

Page 13: ...LTE4 LTS4 2 1 1 ARUN280LTE4 LTS4 2 1 1 ARUN300LTE4 LTS4 2 1 1 ARUN320LTE4 LTS4 2 1 1 ARUN340LTE4 LTS4 2 1 1 ARUN360LTE4 LTS4 2 1 1 ARUN380LTE4 LTS4 2 1 1 ARUN400LTE4 LTS4 2 2 ARUN420LTE4 LTS4 3 1 1 1 ARUN440LTE4 LTS4 3 1 1 1 ARUN460LTE4 LTS4 3 1 1 1 ARUN480LTE4 LTS4 3 1 1 1 ARUN500LTE4 LTS4 3 1 2 ARUN520LTE4 LTS4 3 1 2 ARUN540LTE4 LTS4 3 1 2 ARUN560LTE4 LTS4 3 1 2 ARUN580LTE4 LTS4 3 1 2 ARUN600LTE...

Page 14: ...sic function L Neo Plasma Wall Mounted C Plasma Ceiling Cassette G Low Static ART COOL Type Panel Color R Mirror V Silver B Blue V Silver E Red G Gold 1 Kiss X DX Coil ARU N L E 200 T 4 Serial Number Primary Main Fuction S Standard E High Efficiency Secondary Usage Embient H High Ambient C Cold Area R Anti Corosion Electrical Ratings Air Discharge Type S Side Discharge T Top Discharge N Top Discha...

Page 17: ... Pressure protection control 25 3 2 Discharge temperature control 26 3 3 Inverter protection control 26 3 4 Phase detection 27 3 5 Pressure switch 27 4 Other control 28 4 1 Initial setup 28 4 2 Emergency operation 30 4 3 Refrigerant Auto Charging 32 4 4 Pump Out 33 4 5 Refrigerant amount automatic judgment 34 4 6 ITR Cooling 35 4 7 ITR Heating 36 4 8 FDD Code 38 4 9 Multi V ITR result report 39 4 ...

Page 18: ...ode 2 Heating mode Tc can be set various step at installation mode Note By setting dip switch Te and Tc are decided simultaneously 1 1 Normal operation 1 Basic control Compressor Fan Main EEV Subcooling Indoor Unit EEV EEV Fuzzy control Fuzzy control Upper Min pulse Low Full open Fuzzy control Superheat fuzzy control Normal Vapor injection Avoiding control of high discharge temperature Subcooling ...

Page 19: ...C Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during cooling mode The degree of Subcool Tcondensation Tliquid Tliquid temperature at outlet of subcooler C Tcondensation condensation temperature equivalent to high pressure C 3 Avoiding excessive high discharge temperature when main EEV opens some given opening R410A 800 pls and discharge temperatur...

Page 20: ... is kept continuously then oil return operation will be start n Oil return process ends if compressor protection control starts OFF 80 pulse Normal control 30Hz Ending OFF 20 pulse Normal control Setting Value Running OFF Min pulse Upper Min pulse Low Max pulse Upper Min pulse Low Max pulse Upper Normal control Low Normal control Normal control 30Hz Starting 4way valve Subcooling EEV Main EEV FAN ...

Page 21: ...tdoor Unit Indoor Unit 80 130 pulse Normal control Normal control Ending 400 800 pulse 400 800 pulse OFF Running 80 130 pulse Normal control Normal control Starting 4way valve Subcooling EEV Main EEV FAN Inv Compressor Component ON Min pulse Upper Min pulse Low Max pulse Normal control 30Hz Starting OFF 20 pulse Upper Min pulse Low Max pulse Normal control Setting Value Running ON 80 pulse Upper N...

Page 22: ...mponent Normal control OFF Ending 400 800 pulse OFF Running Normal control OFF Starting Thermo on unit EEV Fan Component Function 2 2 Defrost Defrost operation eliminates ice accumulated on heat exchanger recovering performance of heat exchanger Each cycle component operates as following table during defrost operation n Ending condition 1 All heat exchanger pipe temperature are above setting tempe...

Page 23: ... FAN Inv Compressor Component Normal control ON Setting Normal control ON Low Normal control ON Setting Thermo on unit EEV Fan Component Ending Running Starting 2 3 Partial Defrost ARUN LTE4 ONLY Partial defrost operation divides heat exchanger with upper and parts that gives a chance to make the defrost separately in order to proceed the heating performance continuously Each cycle component opera...

Page 24: ...mponent OFF over 30 C air temperature Stop Min pulse Note ON Stop OFF Operation 4way valve Subcooling EEV Main EEV FAN Inv Compressor Component 16 pulse 32 pulse 16 pulse 32 pulse Stop Min pulse When oil level which is measured by oil level sensor is kept differently between each compressor then oil equalizing EEV will be open during 5 minutes This function prevent oil unbalance between inverter c...

Page 25: ...Hz 10sec Fan Stop 50RPM 10sec Function 3 1 Pressure protection control 3 1 1 Pressure control on cooling mode n High pressure control n Low pressure control h Frequency holding frequency or RPM is not increasing can decrease h Frequency holding frequency or RPM is not increasing can decrease 3 Protection control Pressure Range Pd 4000 kPa 3775 kPa 3578 kPa Pd 3775 kPa Pd 3513 kPa Pd 3480 kPa Pd 34...

Page 26: ...ompressor Sub cooling EEV IDU EEV Tdis 110 Tdis 100 Normal control SC SH decrease control SH decrease control Tdis 100 Frequency holding SC SH decrease control SH decrease control Tdis 105 Tdis 108 Compressor Current AC Input Current Cooling mode Heating mode Compressor Current AC Input Current 4 8Hp 6 8Hp 4 8Hp 6 8Hp 4 8Hp 6 8Hp 22A or less 30A or less 22A or more 30A or more 22A or more 32A or m...

Page 27: ...or short two wires directly 3 4 Phase detection n Power lines are connected correctly like follow case product do not work and display error no Case 1 Missed connect 1 or more phase line Case 2 N phase line is incorrectly connected Function h The error occur 2 or more unit of the series at the same time only a small unit number will be displayed Example Master and Slave2 occur error no 50 ʻ501ʼ di...

Page 28: ...re initial setup 1 Step 1 factory setting value display Factory setting value is displayed in 7 segment on PCB for 24sec All dip switches must be set properly before step 1 4 Other control Power is on Master model code is displayed 3sec Slave1 model code is displayed 3sec Slave2 model code is displayed 3sec Total capacity including sub units is displayed 2sec Heat pump Display 2 is default value P...

Page 29: ... t normal 105 is displayed in 7 segment If error is displayed check corresponding wires 4 Step 4 Auto addressing of indoor units Auto addressing begins when address red button in Main PCB is pressed for 6 sec During auto addressing 7 segment on main PCB displays 88 After auto addressing the number of indoor units is displayed in 7 segment for 30 sec The address of each indoor unit is displayed on ...

Page 30: ...e blank save in EEPROM Static pressure com pensation oFF op1 op3 selected the option change the set value blank save in EEPROM Night low noise oFF op1 op12 selected the option change the set value blank save in EEPROM Overall defrost on oFF selected the option change the set value blank save in EEPROM ODU address 0 255 set the value change the set value blank save in EEPROM Snow removal rapid defr...

Page 31: ...Inverter compressor fail of Slave1 INV1 INV2 INV1 INV2 INV1 INV2 Unit fail of Slave2 INV1 INV2 INV1 INV2 INV1 INV2 Backup mode cancellation method Select the Action using Button off Push the button SLAVE1 unit PCB DIP switch on No 5 Select the mode using Button SVC Push the button Select the Function using Button Se4 Push the button Select the Option using Button inv1 Push the button Select the Ac...

Page 32: ...7 segment The process of the test drive and state of error are displayed using only the master outdoor uint 5 If the error is occurred during the test drive it will be operated the last step after turn off the test drive Ater the dip switch off pressing the black button for 2 seconds in order to reset all data and return to operation standby state 6 SW04C X Cancel button and SW01C execute button i...

Page 33: ...rigerant amount surely if install Refrigerant charging time can be different following the charging refrigerant amount Charging time about 3 minute kg Yes Yes Yes Yes Yes Yes Cooling Heating No No No No No No No Start Expression Blowing mode for 1 minute Start refrigerant charging Cycle instability Reverse switching indoor unit OFF Start system full room operation Operate refrigerant amount judgme...

Page 34: ...ing 18 32 heating 10 27 If the system are turned off continuously by low pressure decrease excessively due to refrigerant lack before E10 expres sion try again after add about 15 refrigerant of regular refrigerant amount Press SW04C X Cancel button and down dip switch after function end Gas pipe Liquid pipe Refrigerant Scales Manifold CAUTION 1 When you put refrigerant using the specified equipmen...

Page 35: ...le Condition After 40minutes End Cooling Heating The numeral on 7 segment is the result value of the amount of refrigerant which is the degree of hyperactivity or lack of the percentage value about current amount of refrigerant per the total amount of refrigerant ex1 20 refrigerant hyperactivity need to remove ex2 20 lack refrigerant need to charge ex3 Don t need to adjustment If it is out of the ...

Page 36: ... IDU operation on Fan mode on 1 minute Check Temp Condition Yes No System off Stop operation and judge the result Judge IDU EEV Switchover 4way valve All IDU operation refrigerant check and save data All 1 IDU operation and save data 1 IDU operation and save data Judgment Code Display ITR Cooling IDU EEV OK 5 Cn NG 5 C1 Impossible to Judge 5 CF Refrigerant More than standard ex 20 Less than standa...

Page 37: ...oor unit error that indoor unit operate in fan mode But don t display the indoor unit number that occurred an error 4 7 ITR Heating This function is checking process for normal operation of parts and system On operating system Saved data can check using LGMV Start All IDU operation on Fan mode on 1 minute Check Temp Condition All IDU operation refrigerant check and save data All 1 IDU operation an...

Page 38: ...possible to Judge 6 CF Outdoor Main EEV OK 7 Cn NG 7 C1 Impossible to Judge 7 CF Refrigerant More than standard ex 20 Less than standard ex 15 Don t Adjustment required 00 Impossible to Judge 3 CF Guaranteed Temperature range Error occurs out of guaranteed temperature range IDU 18 32 C ODU 10 24 C In case the function is not used set the dip S W OFF and reset the power Function ...

Page 39: ...table Error E03 Temperature Range Error E04 Can t operate FDD function to be frost E05 In case error occurs during sensor checking process E06 Occurs when the indoor unit number is one E07 If not click the button in auto charging function E08 FDD feature forced termination Or Refrigerant auto charging normal termination E09 Wait a system off for operate FDD function E10 Need additional refrigerant...

Page 40: ...mp 20 30 C ODU Air Temp Indoor Unit IDU pipe inlet Temp IDU pipe outlet temp IDU LEV Openess Outdoor Unit Pressure High Pressure 3 600kPa Cool 2 300kPa Heat Low Pressure 1 300kPa Cool 200kPa Heat COMP COMP Operate Combination CT Value ODU 1 Comp1 24A ODU 1 Comp2 ODU 2 Comp1 ODU 2 Comp2 ODU 3 Comp1 50 C 100 C ODU 3 Comp2 ODU 4 Comp1 ODU 4 Comp2 Discharge Temp ODU 1 Comp1 ODU 1 Comp2 ODU 2 Comp1 ODU...

Page 41: ...pressure under 307kPa blink Note 1 Note 2 Yes Low pressure 229kpa IDU ODU OFF Power reset after Dip switch off Pump down completed Press the red button SW01C Satisfy low pressure target ODU SVC V V Setting ODU SVC V V Setting Note If low pressure become under 307kPa blink close the gas SVC V V of all ODU immediately If low pressure descends below 229 kPa the system turns off automatically Close th...

Page 42: ... button SW01C Satisfy low pressure target ODU SVC V V Setting ODU SVC V V Setting Note If low pressure become under 307kPa blink close the gas SVC V V of all ODU immediately If low pressure descends below 229 kPa the system turns off automatically Close gas SVC V V immediately This function is operating only Heat Pump model Caution 1 Use pump out function within guaranteed temperature range IDU 10...

Page 43: ... pump out 3 Close gas pipe of unit after completion 4 End pump out 5 Eliminate refrigerant in common pipe after opening the common pipe of corresponding ODU Replace compressor and perform vacuum 6 Add the refrigerant with auto charging function gas pipe liquid pipe gas pipe liquid pipe gas pipe liquid pipe Heating mode Slave2 Heating mode Slave1 Heating mode Master Liquid pipe Gas Pipe Service Por...

Page 44: ...t SVC immediately if error occurs 2 Auto back up is set up to 1 inverter Comp 3 If Inverter Comp Auto Back up starts error displays for 10 min every 6 hours 4 Error displays continuously at the corresponding ODU Inverter compressor failure NO 21 22 26 27 error occur INV Comp Auto Back up Operation IDU ODU display error for 10 min IDU remote controller error clear IDU operation possible No Yes Exam...

Page 45: ...et the power If ODU RPM changes cooling capacity may go down RPM Time Settings Noise Master unit PCB DIP switch on No 5 Select the mode using ʻ ʼ ʻ ʼ Button Func Push the ʻ ʼ button Select the Function using ʻ ʼ ʻ ʼ Button Fn3 Push the ʻ ʼ button Select the Option using ʻ ʼ ʻ ʼ Button op1 op12 Push the ʻ ʼ button Start the Night low noise function Save the selected option value in EEPROM Step Judg...

Page 46: ...n Vacuum mode setting method Vacuum mode cancellation method Push the reset button on Master unit PCB Select the mode using ȯ ȭ Button SVC Push the button Select the Function using ȯ ȭ Button Se3 Push the button Master unit PCB DIP switch on No 5 Select the mode using ȯ ȭ Button Func Push the button Select the Function using ȯ ȭ Button Fn2 Push the button Select the Option using ȯ ȭ Button op1 op3...

Page 47: ...using ȯ ȭ Button oFF op1 op2 Push the button Cool Heat Selection mode is set Switch Phase Switch Bottom Left side Right side mode setting method mode setting method Switch control Function Switch Phase Switch Bottom oFF op1 mode op2 mode Right Left Not operate Cooling Cooling Right Right Not operate Heating Heating Left Not operate Fan mode Off CAUTION Ask an authorized technician to setting a fun...

Page 48: ..._2 seg_3 seg_4 op1 Current High Pressure P1 4321kPa 4 3 2 1 op2 Current low Pressure P2 1234kPa 1 2 3 4 op3 Inv 1 Pulse h1 120 1 2 0 op4 Inv 2 Pulse h2 30 3 0 op5 fan rpm h3 110 1 1 0 op6 Subcooling degree T1 5 3 5 3 op7 Superheating degree T2 4 5 4 5 op8 ODU temp T3 10 1 0 0 op9 Suctino temp T4 43 4 4 3 4 op10 Comp1 discharge temp T5 150 1 5 0 op11 Comp2 discharge temp T6 124 1 2 4 op12 Liquid pi...

Page 50: ... refrigerant to evaporate increasing the insulation resistance Check if high low pressure common pipe liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Check if there are any problems in automatic addressing or not Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units 1 Checks Before Test Run CAUTIO...

Page 51: ...g failure frozen outdoor heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Motor failure bad ventilation around outdoor heat exchanger Bad connector contact Coil failure EEV clogged EEV clogged Check resistance between terminals and chassis Change strainer Check Oil level after op...

Page 52: ...ght reserved Only for training and service purposes LGE Internal Use Only n Location of setting Switch 3 DIP Switch Setting DIP SW01 7 Segment SW04C X cancel SW03C ȯ forward SW02C ȭ backward SW01C Ɨ confirm SW01D reset Heat Pump Main PCB Test Run ...

Page 53: ...r unit from the 7 segment LED The dip switch setting should be changed when the power is OFF Checking the initial display The number is sequentially appeared at the 7 segment in 5 seconds after applying the power This number represents the setting condition For example represents R410A 30HP Checking the setting of outdoor units Test Run Initial display order Example ARUN620LTE4 Master Unit Slave U...

Page 55: ...6 2 2 Fan Motor 57 2 3 Electronic Expansion Valve 58 2 4 Phase Bridge Diode Checking Method 61 2 5 Inverter IPM Checking Method 62 2 6 Fan IPM Checking Method UX3 chassis 63 2 7 Fan IPM Checking Method UX2 chassis 64 2 8 Pressure Sensor High Low Pressure Sensor 65 2 9 Outdoor Fan 65 2 10 Solenoid Valve 66 2 11 Reverse Valve 67 2 12 Temperature Sensor 67 2 13 Others 68 3 Self diagnosis function 69 ...

Page 56: ...ound after switching ON the power supply Heating failure frozen outdoor heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Motor failure bad ventilation around outdoor heat exchanger Bad connector contact Coil failure EEV clogged EEV clogged Check resistance between terminals and c...

Page 57: ...rter occurred 2 You can use rectification voltmeter if using commercial frequency tester when measuring output values of the inverter when measuring absolute values Accurate measuring values cannot be obtained with a gen eral movable tester For analog and digital mode 1 2 Is how long power on during operation Does failure appears again when starting operation Method to measure insulation resistanc...

Page 58: ...e firmly secured by tightening screws 4 Check connection of polarity 5 Check short circuit and grounding Measure winding resistance of the motor coils 14 2Ω 7 25 Replace the fuse if there is defect Fuse 800V 30A Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as speci fied in above 1 through 4 Carefully chec...

Page 59: ...in the ON state motor will not operate smoothly and start vibrating EEV valve operation ø1 ON ON OFF ON ø2 ON ON ON OFF ø3 OFF OFF ON OFF ø4 OFF OFF OFF ON Output ø No Output state 1 2 3 4 Valve open Angle close pulse open Full open 1950 pulses At power ON open angle signal of 1400 pulses out put and valve position is set to ⓐ If valve operates smoothly no noise and vibration occurs and if valve i...

Page 60: ...E Internal Use Only EEV Coil and body Outdoor unit Remove and assemble the coil Lead wire Coil Body Body Body Grip the A part tightly and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body Assemble Remove Checking Method for Key Components ...

Page 61: ... coil terminal red white red yellow red orange red blue 2 If the estimated resistance value is in 52 3 then the EEV is normal Replace EEV Outdoor unit 1 Check the resistance between coil terminal brown white brown yellow brown orange brown blue 2 If the estimated resistance value is in 150 10 then the EEV is normal Replace EEV Indoor unit 1 Operate indoor unit with FAN mode and operate another ind...

Page 62: ... the value is small 0 Ω or high hundreds M Ω PCB needs to be replaced 6 In case that bridge diode is damaged check if Comp Converter PCB assembly IPM is needed to be replaced Red and black are the measuring terminals of multi tester Internal circuit diagram Appearance R red 0 4 V 0 7 V S red 0 4 V 0 7 V T red 0 4 V 0 7 V R black 0 4 V 0 7 V S black 0 4 V 0 7 V T black 0 4 V 0 7 V Diode terminal te...

Page 63: ...ce mode should be within 2 3K Ω 10 25 6 In case measured value is different from the table PCB needs to be replaced PCB damaged Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 2 3K Ω 10 25 3 0K Ω 10 25 V terminal red 2 3K Ω 10 25 3 0K Ω 10 25 W terminal red 2 3K Ω 10 25 3 0K Ω 10 25 P terminal red N terminal red U terminal black 3 0K Ω 10 25...

Page 64: ...e value should be within 2 3KΩ 10 25 as shown below table 6 If the measured value is different from the value given in the table PCB is needs to be replaced Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 2 3K Ω 10 25 3 0K Ω 10 25 V terminal red 2 3K Ω 10 25 3 0K Ω 10 25 W terminal red 2 3K Ω 10 25 3 0K Ω 10 25 P terminal red N terminal red ...

Page 65: ...measured value is open hundreds KΩ measure resistance mode and the value should be within 35 KΩ 10 25 as shown below table 6 If the measured value is different from the value given in the table PCB is needs to be replaced Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 35K Ω 10 25 Open V terminal red 35K Ω 10 25 Open W terminal red 35K Ω 10 ...

Page 66: ...need to be replaced 4 The composition of pressure sensor The pressure sensor is composed like the circuit picture shown above If DC 5V voltage flows on red and black wire voltage would be made between the white and black wire The pressure which is equivalent to the pressure output is shown in the table above 1 The outdoor fan is controlled by the inverter motor which can control the number of rota...

Page 67: ...on and off repeatedly by the condition of cycle operation this does not indicate the break down of the unit 5 Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC mega tester DC 500V 2 Partial defrosting solenoid valve 1 Defrost operation eliminates ice attached on heat exchanger recovering performance of heat exchanger 2 Two solenoid valv...

Page 68: ...t of 4 way valve 6 Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC mega tester DC 500V 1 outdoor temperature sensor TH1 2 Pipe temperature sensor TH2 3 Discharge pipe D pipe temperature sensor TH3 1 Check the condition of installation and the contact of temperature sensor 2 Check whether the connector contact of temperature sensor is ...

Page 69: ...ter to resistance mode connect the probe to terminal of the capacitor If the estimated resistance value is increase continuously without short value is 0 then the resistor is normal 3 Set the multi meter to resistance mode confirm that the resistance value of the resistor is around 270 kOhm Check and replace inferior components Electrolytic capacitor and resistor for voltage distribution 2 15 Othe...

Page 70: ...it indoor unit Failing to receive outdoor unit signal in indoor unit PCB 0 6 Outlet pipe temperature sensor of indoor unit Outlet pipe temperature sensor of indoor unit is open or short 0 9 Indoor EEPROM Error In case when the serial number marked on EEPROM of Indoor unit is 0 or FFFFFF 1 0 Poor fan motor operation Disconnecting the fan motor connector Failure of indoor fan motor lock 1 7 Inlet Ai...

Page 71: ...ge Master Outdoor Unit input voltage is over 487V or below 270V 2 Slave1 Outdoor Unit Input Voltage High Low Voltage Slave1 Outdoor Unit input voltage is over 487V or below 270V 3 Slave2 Outdoor Unit Input Voltage High Low Voltage Slave2 Outdoor Unit input voltage is over 487V or below 270V 4 Slave3 Outdoor Unit Input Voltage High Low Voltage Slave3 Outdoor Unit input voltage is over 487V or below...

Page 72: ...e System is turned off by Slave3 Outdoor Unit Inverter Compressor2 High Discharge Temperature 3 4 1 High Pressure of Master Outdoor Unit System is turned off by excessive increase of high pressure of Master Outdoor Unit 2 High Pressure of Slave1 Outdoor Unit System is turned off by excessive increase of high pressure of Slave1 Outdoor Unit 3 High Pressure of Slave2 Outdoor Unit System is turned of...

Page 73: ...rge Temperature Sensor Fault Slave3 Outdoor Unit Inverter Compressor Discharge Temperature Sensor open or short 4 2 1 Master Outdoor Unit Low Pressure Sensor Fault Master Outdoor Unit Low Pressure Sensor open or short 2 Slave1 Outdoor Unit Low Pressure Sensor Fault Slave1 Outdoor Unit Low Pressure Sensor open or short 3 Slave2 Outdoor Unit Low Pressure Sensor Fault Slave2 Outdoor Unit Low Pressure...

Page 74: ...er Compressor2 Discharge Temperature Sensor Fault Master Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor open or short 2 Slave1 Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor Fault Slave1 Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor open or short 3 Slave2 Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor Fault Slave2 Outdoor Unit Invert...

Page 75: ...t 3 Communication error Main PCB inverter PCB Failing to receive signal main PCB at inverter PCB of Slave2 Outdoor Unit 4 Communication error Main PCB inverter PCB Failing to receive signal main PCB at inverter PCB of Slave3 Outdoor Unit 5 9 1 Mixing Installation of Sub Outdoor Unit Mixing Installation of Old Sub Outdoor Unit and New Slave Outdoor Unit 6 0 1 Inverter PCB EEPROM Error of Master Out...

Page 76: ...ave3 Outdoor Unit 7 1 1 Converter CT Sensor Error of Master Outdoor Unit Restriction of Master Outdoor Unit 2 Converter CT Sensor Error of Slave1 Outdoor Unit Restriction of Slave1 Outdoor Unit 3 Converter CT Sensor Error of Slave2 Outdoor Unit Restriction of Slave2 Outdoor Unit 4 Converter CT Sensor Error of Slave2 Outdoor Unit Restriction of Slave3 Outdoor Unit 7 5 1 Master Outdoor Unit Fan CT S...

Page 77: ... Position Sensing Failure 8 6 1 Master Outdoor Unit Main PCB EEP ROM Error Communication Fail Between Master Outdoor Unit Main MICOM and EEPROM or omitting EEPROM 2 Slave1 Outdoor Unit Main PCB EEP ROM Error Communication Fail Between Slave1 Outdoor Unit Main MICOM and EEPROM or omitting EEPROM 3 Slave2 Outdoor Unit Main PCB EEP ROM Error Communication Fail Between Slave2 Outdoor Unit Main MICOM a...

Page 78: ...nal at main PCB of Slave3 unit 1 0 6 1 Master Outdoor Unit FAN IPM Fault Error Instant Over Current at Master Outdoor Unit Fan IPM 2 Slave1 Outdoor Unit FAN IPM Fault Error Instant Over Current at Slave1 Outdoor Unit Fan IPM 3 Slave2 Outdoor Unit FAN IPM Fault Error Instant Over Current at Slave2 Outdoor Unit Fan IPM 4 Slave3 Outdoor Unit FAN IPM Fault Error Instant Over Current at Slave3 Outdoor ...

Page 79: ...ure Sensor open or short 1 1 6 1 Master Outdoor Unit Oil level Sensor Error Master Outdoor Unit Oil level Sensor Error is open or short 2 Slave 1 Outdoor Unit Oil level Sensor Error Slave 1 Outdoor Unit Oil level Sensor Error is open or short 3 Slave 2 Outdoor Unit Oil levelSensor Error Slave 2 Outdoor Unit Oil level Sensor Error is open or short 4 Slave 3 Outdoor Unit Oil level Sensor Error Slave...

Page 80: ...com communi cation failed 2 Slave1 outdoor unit External Board Main Sub Micom communication error Slave1 Outdoor Unit Main Board Main Sub Micom communi cation failed 3 Slave2 outdoor unit External Board Main Sub Micom communication error Slave2 Outdoor Unit Main Board Main Sub Micom communi cation failed 4 Slave3 outdoor unit External Board Main Sub Micom communication error Slave3 Outdoor Unit Ma...

Page 81: ...ain reason In case the value is more than 100kΩ open or less than 100Ω short Error occurs Refer Resistance value maybe change according to temperature of temp sensor It shows according to criteria of current temperature 5 margin Normal Air temp sensor 10 C 20 7kΩ 25 C 10kΩ 50 C 3 4kΩ Pipe temp sensor 10 C 10kΩ 25 C 5kΩ 50 C 1 8kΩ n Error diagnosis and countermeasure flow chart Is sensor properly c...

Page 82: ...r unit Error No Error Type Error Point Main Reasons The remote controller did not receive the sig nal from indoor unit during specific time 1 Remote controller fault 2 Indoor unit PCB fault 3 Connector fault Wrong connection 4 Communication cable problem n Error diagnosis and countermeasure flow chart If there is no remote controller to replace Use another unitʼs remote controller doing well Check...

Page 83: ...n filled half with condensate water half level of float switch Is drain pump working Sound drain noise contact etc Replace float switch Replace Indoor PCB or reconnect the connector Yes Yes No No Is Float switch short On measuring its resistance No Yes Drain pump blocked by foreign particles Yes No In indoor unit PCB Does the terminal voltage for drain pump has 220V output Replace indoor unit PCB ...

Page 84: ...All right reserved Only for training and service purposes LGE Internal Use Only Indoor PCB drain pump connector Check input of 220V Marked as CN DPUMP float A Point to check rotating Float switch Housing CN FLOAT Standard of drain pipe head height slope MAX 450 ...

Page 85: ...No Yes No Outdoor PCB fault Replace after checking Re connect communication cable No Yes Indoor PCB fault Replace after checking Note1 communication from IDU is normal if voltage fluctuation 9V 9V exists when checking DC voltage of communication terminal between IDU and ODU Is total number of indoor units connected displayed after auto addressing No END If the DC voltage between communication term...

Page 86: ...n between the micro processor and the EEPROM on the sur face of the PCB 2 ERROR due to the EEPROM damage Error No Error Type Error Point Main Reasons Error occur in EEPROM of the Indoor PCB Indoor unit EEPROM error n Error diagnosis and countermeasure flow chart Replace the indoor unit PCB and then make sure to perform Auto addressing and input the address of central control ...

Page 87: ...tor connection proper Yes No Connect properly Is fan motor normal Replace indoor unit fan motor It is normal when check hall sensor of indoor fan motor as shown below Yes No k Replace indoor unit PCB Checking connection state of fan motor connector 1 4 5 6 7 1 5 6 7 4 4 4 4 Each termainl with the tester Tester TH chassis hundreds kΩ hundreds kΩ hundreds kΩ hundreds kΩ TD chassis Normal resistance ...

Page 88: ... 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are there any power wire connections normal No Yes 1 Check R S T N Wiring Condition Rewire them if abnormality found Is Comp PCB assembly normal No Check Comp PCB assembly IPM normality Replace Comp PCB assembly if abnormality found Is compressor Wire connection condition normal No ...

Page 89: ...ight reserved Only for training and service purposes LGE Internal Use Only Check joining conditon Check DC_Link Connector joining condition IPM joining point Measuring resistance between each terminal of compressor Compressor wire connector connection point _ R S T ...

Page 90: ...gerant pressure Reassemble or manage if abnormality found Is converter PCB assembly bridge diode joining condition normal No Check joining condition of converter PCB assembly and bridge diode joining again if abnormality found Yes Is input voltage normal No Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Yes...

Page 91: ...cs Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connector connection Measuring input voltage Check DC_Link Connector joining condition _ R S T ...

Page 92: ...s 220V 10 Check connection condition and wiring if power is abnormal Are there any power wire connections normal No Yes 1 Check R S T N wiring conditions Rewire them if abnormality found Is Comp PCB assembly normal No Check Comp PCB assembly IPM normality Replace Comp PCB assembly if abnormality found Is bridge diode normal No 1 Check joining condition of bridge diode and heatsink 2 Check bridge d...

Page 93: ...Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Check DC_Link Connector joining condition Measuring input voltage _ R S T DC_Link Connector N terminal P terminal ...

Page 94: ...h in outdoor unit Excessive rise of discharge pressure in outdoor com pressor 24 Master 241 Slave1 242 Slave2 243 Slave3 244 Is high pressure switch connector connected to PCB No Note 1 Note 2 Note 2 Connect securely Is high pressure switch connector short during off time Yes No Is this error appeared again after reset Yes No Is SVC valve open Yes Re check momentary problem or not Replace connecti...

Page 95: ...Yes Are there any power wire connections normal No Yes 1 Check R S T N wiring conditions Rewire them if abnormality found Is input voltage normal No Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is converter PCB assembly bridge diode joining condition normal No Check joining condition of converter PCB asse...

Page 96: ... 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor U V 0 255 7 V W 0 255 7 W U 0 255 7 75 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the resistance Between each phase and insulation resista...

Page 97: ...oting Guide 97 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connection ...

Page 98: ...agnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is Converter PCB assembly normal No Yes Replace Converter PCB assembly 1 Check R S T N wiring conditions 2 Check Noise filter wiring conditions Rewire ...

Page 99: ...ion normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check resistance between each terminal of compressor U V 0 255 7 V W 0 255 7 W U 0 255 7 75 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality fou...

Page 100: ...00 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connection Measuring input voltage ...

Page 101: ...ponents and operation conditions Take measures Replace strainer No Yes No Yes No Yes No Yes No Yes Resistance value of discharge temperature sensor 10C 362k 25C 200k 50C 82k 100C 18 5k Error No Error Type Error Point Main Reasons 32 Master 321 Slave1 322 Slave2 323 Slave3 324 Over increase discharge temperature of inverter com pressor 1 at main outdoor unit Compressor is off because of over increa...

Page 102: ...mpres sor off due to over increase of high pres sure by high pressure sensor Over increase of dis charge pressure of compressor 34 Master 341 Slave1 342 Slave2 343 Slave3 344 Is service valve opened No Open service valve Are communication cable pipe connection normal Yes No Is refrigerant amount normal refer refrigerant part Yes No Is fan normal Indoor fan during heating Outdoor fan during cooling...

Page 103: ...4 Is service valve opened Open service valve Are communication cable piping normal Yes No Is amount of refrigerant normal refer refrigerant part Yes No Is fan normal in heating outdoor fan in cooling indoor fan Yes Adjust the amount of refrigerant Additive charge check communication piping correction Check and replace related parts error 105 108 reference Is strainer Ok No Replace the strainer No ...

Page 104: ...rmal R N 2 ODU Comp PCB damage CT sensing part n Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is Comp PCB assembly normal No Yes Replace Comp PCB assembly Measuring input voltage Comp PCB ...

Page 105: ...on 10C 362k 25C 200k 50C 82k 100C 18 5k Check the resistance inverter compressor discharge temperature sensor Error No Error Type Error Point Main Reasons 41 Inverter1 Master 411 Slave1 412 Slave2 413 Slave3 414 Compressor1 dis charge pipe tempera ture sensor error Sensor measurement value is abnormal Open Short 1 Defective connection of the compressor1 discharge pipe temperature sensor 2 Defectiv...

Page 106: ...fect of high pressure connector Open Short 3 Defect of outdoor PCB Error No Error Type Error Point Main Reasons Abnormal value of sensor Open Short Abnormal value of sensor Open Short Sensor error of low pressure Sensor error of high pressure 42 Master 421 Slave1 422 Slave2 423 Slave3 424 43 Master 431 Slave1 432 Slave2 433 Slave3 434 Is sensor connected to PCB correctly Connect sensor to PCB corr...

Page 107: ...or Outdoor Unit IPM Temperature Sensor Fault 44 Master 441 Slave1 442 Slave2 443 Slave3 444 46 Master 461 Slave1 462 Slave2 463 Slave3 464 49 Master 491 Slave1 492 Slave2 493 Slave3 494 45 Master 451 Slave1 452 Slave2 453 Slave3 454 Is sensor connected to PCB correctly Is sensor value correct Connect sensor to PCB correctly Replace sensor Replace corresponding outdoor unit PCB Yes No No Yes If val...

Page 108: ...Chart Measuring input voltage Noise filter wiring Field Fault Case R Phase Terminal Changed Color Is input voltage normal No Yes Recheck power and installation condition Yes Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Are there any power wire connections normal No Yes 1 Check R S T N wiring conditions Re...

Page 109: ...f outdoor unit capacity at LGMV No Yes Check following dip S W setting is on Slave1 No 6 Slave2 No 7 Slave3 No 6 7 No Adjust corresponding DIP switch Yes Is power of Slave PCB On Check LED blinking Yes No Are quantity and capacity of indoor units installed same as the data of LGMV Yes Adjust the capacity of indoor and outdoor unit No Check communication cables between indoor and outdoor units Is m...

Page 110: ... Main PCB 52 Master 521 Slave1 522 Slave2 523 Slave3 524 n Error diagnosis and countermeasure flow chart Is communication LED Yellow of Comp1 Comp2 PCB PCB on No Re connect communication cable Is communication cable connected correctly Yes No Re connect communication cable Is Main PCB normal Yes No Replace Main PCB Replace Comp1 Comp2 PCB The method of checking Main PCB and Comp1 Comp2 PCB If norm...

Page 111: ...D blinking Replace communication PCB 3 Auto addressing after replace Communication PCB Check outdoor Main PCB Is communication cable connected correctly No Yes Supply power Is power supplied to indoor PCB No Yes Are quantity of indoor Units installed same as The data of LGMV In case of CH53 almost happened with CH05 the indoor units not operated actually are normal so check with same method of CH0...

Page 112: ...d Only for training and service purposes LGE Internal Use Only Wiring Fault Case Indoor Unit Communication PCB 1 time 10 sec Turn on off Indoor Communication Part Outdoor Unit Communication PCB Communication Part in Main PCB Communication Part in External PCB Remark IDU A IDU B ...

Page 113: ...ve inverter signal at main PCB of Outdoor Unit Communication error Main PCB Comp PCB 57 Master 571 Slave1 572 Slave2 573 Slave3 574 n Error diagnosis and countermeasure flow chart Are there any communication wire connections normal Is Comp PCB assembly normal Is there any error when power reset Recheck power and installation condition 1 Check communication wiring conditions 2 Check connector condi...

Page 114: ...Larger Than Master Capacity 1 Dip Switch Setting Error n Error Diagnosis and Countermeasure Flow Chart Is Dip switch setting normal Is there any error when power reset Recheck installation condition Are there setting with Master Slave1 Slave2 Slaver3 No No No Yes Yes Yes 1 Set the most capacitor ODU for Master Set with Master Slave1 Slave2 Slaver3 1 Replace Main PCB Dip Switch Setting Slave1 Slave...

Page 115: ...ROM contact defect wrong insertion 2 Different EEPROM Version 3 ODU Comp PCB assembly damage n Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal No Yes Recheck power and installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is Comp PCB assembly normal No Yes Replace Comp PCB assembly Inverter EEPROM ...

Page 116: ... Overload Operation Pipe Clogging Covering EEV Defect Ref Overcharge Is Installation Condition Normal No 1 Check Pipe Clogging Distortion 2 Check Covering Outdoor Indoor Unit 3 Check EEV Connector Assemble Condition Normal Operation 4 Check Refrigerant Pressure 5 Check Power Wire Connection Condition Reassemble or Manage if abnormality Found 1 Check Inverter PCBA Screw Connection Condition Reassem...

Page 117: ...ow short will generate error Note Temperate sensor resistance vary with temperature So compare temperature sensor resistance value according to outdoor unit temperature by referring below table 5 tolerance Air temperature sensor 10 C 20 7kΩ 25 C 10kΩ 50 C 3 4kΩ Pipe temperature sensor 10 C 10kΩ 25 C 5kΩ 50 C 1 8kΩ Error No Error Type Error Point Main Reasons 65 Master 651 Slave1 652 Slave2 653 Sla...

Page 118: ... and Countermeasure Flow Chart Is ODU Fan Motor Assemble condition normal No Yes Recheck power and installation condition Check ODU Fan Motor assemble condition and fan locking Reassemble or replace if abnormality found Is ODU Fan Motor normal No Yes 1 Check resistance between each phase U V W of ODU fan motor terminal 16 8Ω 5 at 75 2 Check insulation resistance between ODU fan motor terminal U V ...

Page 119: ...te of power supply 1 Input Voltage is abnormal R N 2 ODU Converter PCB damage CT sensing part Are there any power wire Connections normal No 1 Check R S T N wiring conditions 2 Check noise filer wiring conditions Rewire them if abnormality found Check R S S T T R phase voltage 380V 10 R N S N T N phase voltage 200V 10 Check connection condition and wiring if power is abnormal No Is input voltage n...

Page 120: ... sensor the fan motor phase current is not 2 5V 1 Input Voltage is abnormal not 15V 2 Fan PCB assembly defect 3 Power wire open and connecting fault 4 Inverter PCB assembly defect Is input voltage normal No 1 Check 15V input power wiring conditions Rewire them if abnormality found 1 Replace Fan PCB No Is Fan PCB normal Yes 1 Replace Fan PCB No Is there any error When power reset Yes Yes Recheck Po...

Page 121: ...ow Chart DC Link Voltage Connecting Part Noise filter wiring 1 Check R S T N wiring conditions 2 Check Noise filter wiring conditions Rewire them if abnormality found 1 Check DC Link wiring conditions Rewire them if abnormality found Is Converter PCB assembly normal Check voltage between R S S T T R 380V 10 Check voltage between R NS N T N 220V 10 Rewire them if abnormality found Are there any pow...

Page 122: ...or of motor output terminal U V W connector matched with PCB s 2 Check wire disconnection and wiring Reassemble or replace if abnormality found Is Fan PCB assembly normal Yes No Recheck power and installation condition Yes No 1 Check resistance between each motor output terminal LG motor 8 8Ω 10 25 Panasonic 8 8Ω 10 25 2 Check insulation resistance between ODU fan motor terminal U V W and pipe ove...

Page 123: ...nection and wiring Reassemble or replace if abnormality found Is fan PCB assembly normal Yes No Recheck power and installation condition Yes No 1 Check resistance between each motor output terminal LG motor 8 8Ω 10 25 Panasonic 8 8Ω 10 25 2 Check insulation resistance between ODU fan motor terminal U V W and pipe over 100M Replace fan motor if abnormality found No Are the resistance Between each p...

Page 124: ...s EEPROM Access Error Main PCB EEPROM 86 Master 861 Slave1 862 Slave2 863 Slave3 864 n Error Diagnosis and Countermeasure Flow Chart Reset after checking EEPROM assemble condition Replace Correct EEPROM EEPROM Insertion Same direction both socket hole and EEPROM hole Yes No Yes No Is EEPROM assemble condition normal Correct check sum Recheck power and installation condition Note Replace after powe...

Page 125: ...ing after power is supplied Fan PCB EEPROM Error 87 Master 871 Slave1 872 Slave2 873 Slave3 874 n Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal 1 Check EEPROM insertion direction connection condition 2 Check EEPROM checksum Replace EEPROM if abnormality found Yes No Recheck power and installation condition Is Fan PCB assembly normal Yes No Replace fan PCB assembly Invert...

Page 126: ... Type Error Point Main Reasons Master displays ODU number which is not communicated Slave displays own error number Communication Error Between Outdoors 104 Master 1041 Slave1 1042 Slave2 1043 Slave3 1044 n Error Diagnosis and Countermeasure Flow Chart Is communication cable installed normally Connect communication cable Yes No Is Slave Unit Dip SW setting done Yes Dip SW setting No Is Main PCB po...

Page 127: ...ave2 1053 Slave3 1054 n Error Diagnosis and Countermeasure Flow Chart 1 Check communication cable between Comp PCB and fan PCB Reconnect or replace wire if abnormality found Check communication cable between Comp PCB and fan PCB Reconnect or replace wire if abnormality found Yes No Yes No Is fan PCB communication LED yellow blinking normally Is Comp PCB communication LED yellow blinking normally Y...

Page 128: ...t Check ODU fan motor assemble condition and locking Reassemble or replace if abnormality found 1 Check fan motor U V W connector connection condition 2 Check fan motor wire disconnection Yes No Yes No Yes Is fan motor assemble condition normal Is fan motor wire connection condition normal Is fan PCB assemble condition normal No 1 Check fan PCB connector condition Reassemble if abnormality found 2...

Page 129: ...t Main Reasons Fan PCB DC link voltage supplied below 380V Fan DC Link Low Voltage Error 107 Master 1071 Slave2 1072 Slave3 1074 n Error Diagnosis and Countermeasure Flow Chart 1 Check DC_Link Wire connection 2 DC_Link Replace wire if abnormality found Measure DC_Link voltage Check Converter PCB if voltage is below 380V Yes No Yes No Is wiring between fan motor and PCB normal Is DC_Link voltage no...

Page 130: ...ipe temperature sensor 10 C 10kΩ 25 C 5kΩ 50 C 1 8kΩ Error No Error Type Error Point Main Reasons 113 Master 1131 Slave1 1132 Slave2 1133 Slave3 1134 Outdoor unit liquid pipe condenser tem perature sensor error Abnormal sensor resis tance value Open Short 1 Defective temperature sensor connection 2 Defective temperature sensor Open Short 3 Defective outdoor unit PCB 114 Master 1141 Slave1 1142 Sla...

Page 131: ... Error between Main PCB External PCB 145 Master 1451 Slave1 1452 Slave2 1453 Slave3 1454 Is communication LED Yellow of External PCB on Is communication cable connected correctly Re connect Power cable Re connect communication cable Replace External PCB External Communication Connector External Communication LED Yes Yes No Is Main PCB normal Replace Main PCB Yes No No Communication Connector LED i...

Page 132: ...alve connecter connection are properly connected No Reconnect it After reset can we check supply voltage at PCB when starting heating mode operation No Is 4 way valve coil connected to 4 way valve normally ø No Is 4 Way valve coil resistance normal Change 4 Way valve coil No Yes In case of more than 2 units does master outdoor unit recognize as more than 2 units Refer to CH 51 make measure Yes Is ...

Page 133: ...follow Slave2 Slave1 Mater ODU information is displayed one after the other at main PCB 7 segment 1 Model ID 8HP 8 10HP 10 12HP 12 14HP 14 16HP 16 18HP 18 20HP 20 2 Total Capacity Displayed with HP 3 ODU Type HEAT PUMP 2 4 Power type 380V 38 5 Model type Full Function 1 Checking method for outdoor unit of 3unit system Master Slave1 Slave2 Close all the SVC valves of high low pressure Operate syste...

Page 134: ... Point Main Reasons Failure Receiving Signal Between Main and Sub Micom Communication Error Between Main and Sub Micom of External PCB 182 Master 1821 Slave1 1822 Slave2 1823 Slave3 1824 n Error diagnosis and countermeasure flow chart Press the Rest Button Reset Button Communication LED Between Main and Sub Micom No No Replay On boarding Replace External PCB No Communication Between Main Sub Micom...

Page 135: ...d Operation Pipe Clogging Covering EEV Defect Ref Overcharge Is Installation Condition Normal No 1 Check Pipe Clogging Distortion 2 Check Covering Outdoor Indoor Unit 3 Check EEV Connector Assemble Condition Normal Operation 4 Check Refrigerant Pressure 5 Check Power Wire Connection Condition Reassemble or Manage if abnormality Found 1 Check Fan PCBA Screw Connection Condition Reassemble or Manage...

Page 136: ...hort will generate error Note Temperate sensor resistance vary with temperature So compare temperature sensor resistance value according to outdoor unit temperature by referring below table 5 tolerance Air temperature sensor 10 C 20 7kΩ 25 C 10kΩ 50 C 3 4kΩ Pipe temperature sensor 10 C 10kΩ 25 C 5kΩ 50 C 1 8kΩ Error No Error Type Error Point Main Reasons 194 Master 1941 Slave1 1942 Slave2 1943 Sla...

Page 137: ...e miss connection Yes Yes Yes No No No 1 Reconnect RS 485 communication wire Reset the overlap of IDU address for single address 1 Set the slave mode with Simple central controller after reset 1 RS 485 communication wiring defect 2 Communication defect between remote controller and indoor unit 3 RS 485 dip switch setting error 4 Indoor unit addressing ssetting error on central controller Error No ...

Page 138: ...P NO MFL67369002 April 2013 ...

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