LG AMNW05GSJB0 Svc Manual Download Page 119

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5. Trouble Shooting

- 118 -

Items for

checking

Sub-items for

checking

Checking

power source

Checking

for

over-load
operation

Checking

compressor

Checking

PCBA

Checking

input voltage

Checking

outdoor

devices for

shielding

Checking

refrigerant

for over/shorts

Checking

compressor

wiring

Checking input

current

detection

circuit

Checking

power

connection

state

Checking

outdoor

fan operation

Checking

compressor

Phase resis-

tance

Checking

pipes

for Bending /

blocking

Checking

compressor

insulation

resistance

Checking EEV

for motion

❈

Check for AC190~260 V

❈

Check the manifold gauge pressure

Flow of trouble diagnosis

6.7 Troubleshooting Outdoor Error

CH 22 (Input of Over Current)

Summary of Contents for AMNW05GSJB0

Page 1: ...ti Inverter Type R410A CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel CONFIDENTIAL Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...tion Functions 49 5 Reliability 54 6 Convenience Functions Controls 55 7 Special Function KIT 62 Part 3 Basic Control 65 1 Normal operation 66 2 Compressor control 66 3 EEV Electronic Expansion Valve control 66 4 Oil return control 67 5 Defrost control 67 Part 4 Test Run 68 1 Check before Test Run 69 2 Test Run Flow chart 70 3 Test Runing 71 Part 5 Trouble Shooting Guide 74 1 Self diagnosis Functi...

Page 3: ... 2 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes 1 Safety Precautions 3 2 Model Line Up 12 3 Nomenclature 18 Part 1 General Information ...

Page 4: ...s in Repair Be sure to disconnect all remote electric power supplies before servicing Internal components and circuit boards are at main potential when the equipment is connected to the power cables This voltage is extremely dangerous and may cause death or severe injury if come in contact with it Do not touch the discharging refrigerant gas during the repair work The refrigerant gas can cause fro...

Page 5: ... breaker or power under condition that front panel cabinet top cover control box cover are removed or opened Otherwise it may cause fire electric shock explosion or death The appliance shall be stored so as to prevent mechanical damage from occurring Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry accredited...

Page 6: ...otected from physical damage Checks to the area Prior to beginning work on systems containing flammable refrigerants safety checks are necessary to ensure that the risk of ignition is minimised For repair to the refrigerating system the following precautions shall be complied with prior to conducting work on the system Work procedure Work shall be undertaken under a controlled procedure so as to m...

Page 7: ... all times the manufacturer s maintenance and service guidelines shall be followed If in doubt consult the manufacturer s technical department for assistance The following checks shall be applied to installations using flammable refrigerants The actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are installed The ventilation machinery and ou...

Page 8: ...e not degraded such that they no longer serve the purpose of preventing the ingress of flammable atmospheres Replacement parts shall be in accordance with the manufacturer s specifications NOTE The use of silicon sealant can inhibit the effectiveness of some types of leak detection equipment Intrinsically safe components do not have to be isolated prior to working on them Repair to intrinsically s...

Page 9: ...t of the system remote from the leak Oxygen free nitrogen OFN shall then be purged through the system both before and during the brazing process Removal and evacuation When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures shall be used However it is important that best practice is followed since flammability is a consideration The following pro...

Page 10: ...shall be taken in case analysis is required prior to re use of reclaimed refrigerant It is essential that electrical power is available before the task is commenced a Become familiar with the equipment and its operation b Isolate system electrically c Before attempting the procedure ensure that mechanical handling equipment is available if required for handling refrigerant cylinders all personal p...

Page 11: ...linders shall be complete with pressure relief valve and associated shut off valves in good working order Empty recovery cylinders are evacuated and if possible cooled before recovery occurs The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of flammable refrigerants In addition a set of c...

Page 12: ...ed be sure to do an insulation tset to check the resistance is 2 Mohm or more between the charge section and the non charge metal section Earth position If the resistance value is low a disaster such as a leak or electric shock is caused at user s side Check the drainage of the indoor unit after the repair If drainage is faulty the water to enter the room and wet floor Check to see if the terminal...

Page 13: ...0 USNW12GJ2F0 ZMNW12GSJC0 AMNW15GSJB0 ZMNW15GSJC0 SK USNW18GK2F0 ZMNW18GSKC0 USNW24GK2F0 ZMNW24GSKC0 Deluxe SJ AMNW07GSJL0 ASNW09GJ1Z0 ASNW12GJ1Z0 SK ASNW18GK1Z0 ASNW24GK1Z0 Standard SJ AMNW07GSJR0 USNW09GJRZ0 USNW12GJRZ0 SK USNW18GKRZ0 AMNW24GSKR0 ART COOL Gallary SF ZMNW09GAF10 MA09R NF1 ZMNW12GAF10 MA12R NF1 Ceiling Cassette 1 Way TU ZMNW09GTUA0 MT09R NU1 ZMNW12GTUA0 MT11R NU1 4 Way TR ZMNW05GT...

Page 14: ...ames Capacity kW kBtu h 1 5 5 2 1 7 2 5 9 3 5 12 4 2 15 5 0 18 7 1 24 Ceiling Concealed Duct High Static Pressure M1 ZBNW18GM1A0 CM18R N10 ZBNW24GM1A0 CM24R N10 Low Static Pressure L1 ABNH09GL1A L2 ZBNW09GL2A0 AMNW12GL2A ZBNW12GL2A0 AMNW18GL2A ZBNW18GL2A0 L3 AMNW24GL3A ZBNW24GL3A0 Console QA AQNH09GALA0 CQ09 NA0 AQNH2GALA0 CQ12 NA0 AQNH18GALA0 CQ18 NA0 ...

Page 15: ...M19 UE4 Z3UW21GFA0 MU2R21 UE0 No of connectable indoor units Max 3 Total capacity index of connectable indoor units kW 8 79 9 67 kBtu h 30 33 Power supply 1 Ø 220 240 V 50 Hz Chassis Heat pump A4UW24GFA2 MU4M25 U44 Z4UW24GFA0 MU4R25 U40 A4UW24GFA2 MU4M25 U44 Z3UW21GFA0 MU2R21 UE0 No of connectable indoor units Max 4 Total capacity index of connectable indoor units kW 11 4 12 kBtu h 39 41 Power sup...

Page 16: ... 220 240 V 50 Hz Chassis 1 phase Heat pump A7UW40GFA0 FM40AH U42 A8UW48GFA0 FM48AH U32 A9UW56GFA0 FM56AH U32 No of connectable indoor units Max 7 Max 8 Max 9 Total capacity index of connectable indoor units kW 15 2 18 5 21 4 kBtu h 52 63 73 Power supply 1 Ø 220 240 V 50 Hz Chassis Heat pump A7UW42GFA1 FM40AH U34 A8UW48GFA1 FM48AH U34 A9UW56GFA1 FM56AH U34 No of connectable indoor units Max 7 Max 8...

Page 17: ...ble indoor units Max 7 Max 8 Max 9 Total capacity index of connectable indoor units kW 15 8 18 5 21 4 kBtu h 54 63 73 Power supply 3 Ø 380 415 V 50 Hz Chassis 3 phase Heat pump A7UW42LFA1 FM41AH U34 A8UW48LFA1 FM49AH U34 A9UW56LFA1 FM57AH U34 No of connectable indoor units Max 7 Max 8 Max 9 Total capacity index of connectable indoor units kW 21 1 22 6 24 6 kBtu h 72 78 84 Power supply 3 Ø 380 415 ...

Page 18: ...All rights reserved Only training and service purposes 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 kW 1 5 7 0 1 5 7 0 1 5 7 0 kBtu h 5 24 5 24 5 24 BD unit ...

Page 19: ...Electrical rating G 1ø 220 240V 50Hz 60Hz L 3ø 380 415V 50 60Hz Chassis naem Only Multi Indoor unit type Only Multi S Wall Mounted T Ceiling Cassette A ART COOL Mirror Chassis name Common Indoor Function Indoor unit type A B C Basic L R Ionizer Indicates that this is multi system outdoor unit using R410A Ex A4U Connectable max 4 indoor units A9U Connectable max 9 indoor units Model type W DC inver...

Page 20: ...er Indoor Unit Outdoor Units Detailed product type only for M series models Nominal Capacity Ex 7 000 Btu h Class 07 18 000 Btu h Class 18 Product type Chassis name SQ S M N B 0 15 AM PM PC DM DC MJ P S Wall mounted ARTCOOL mirror MA ARTCOOL MT CT Ceiling Cassette CB CM Ceiling Concealed Duct CV Ceiling Suspended floor CQ Console N Indoor Unit U Outdoor Unit ...

Page 21: ...utdoor unit P Parts 3 5 BD units Global 3 4 Outdoor Unit Europe MU4 M 25 Pipe Connecting Type M Multiple Pipe R410A R Multiple Pipe R32 Cooling heating capacity Ex 18 000 Btu h Class 18 48 000 Btu h Class 48 Indicates that this is multi system outdoor unit using R410A Ex MU3 Connectable max 3 indoor units MU5 Connectable max 5 indoor units FM 19 A H Model Ttype H Heat pump Type of refrigerant A R4...

Page 22: ...2 Self diagnosis Function 54 5 3 Soft dry operation 54 6 Convenience Functions Controls 55 6 1 Auto changeover operation 55 6 2 Auto cleaning operation 56 6 3 Auto Operation Fuzzy Operation 56 6 4 Auto restart Opeartion 57 6 5 Child Lock Function 58 6 6 Forced operation 58 6 7 Group Control 59 6 8 Sleep Timer Operation 60 6 9 Timer On Off 60 6 10 Weekly Program 60 6 11 Two Thermistor Control 61 7 ...

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Page 47: ...tion control key input the left right louver automatically operates with the auto swing or it is fixed to the desired direction 2 2 Auto swing up down By the auto swing key input the upper lower vane automatically operates with the auto swing or it is fixed to the desired direction 2 3 Chaos swing up down By the Chaos swing key input the upper lower vane automatically operates with the chaos swing...

Page 48: ...ol mode is operat ed In the Jet Cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation In the Jet Cool mode operation the room temperature is controlled to the setting temperature 18 C When the sleep timer mode is input while in the Jet Cool mode operation the Jet Cool mode has the priority When the Jet Cool key is input the upper lower vanes are reset to tho...

Page 49: ...nly 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 3 Air purifying Ionizer Photo Catalyst Coated Mesh Dust particles Odour Dust electrode discharge Odour molecule Generating plasma Polluted Air Purified fresh Air 4 8KV discharge ...

Page 50: ...Press button to save 4 5 Pressing button will exit settings mode After setup it automatically gets out of setup mode if there is no button input for 25 seconds When exiting without pressing set button the manipulated value is not reflected If pressing button repeatedly it moves to static pressure selection menu as picture below 2 This function is applied to only duct type Setting this in other cas...

Page 51: ... 2 20 3 29 4 39 5 49 Setting Value 32 01 32 02 32 03 32 04 32 05 32 06 CL18R N20 LOW 10 96 100 103 109 117 125 MID 12 5 109 113 117 123 130 137 HIGH 15 120 124 129 134 141 147 Model Step CMM Static Pressure mmAq Pa 0 0 1 10 2 20 3 29 4 39 5 49 Setting Value 32 01 32 02 32 03 32 04 32 05 32 06 CL24R N30 LOW 12 89 95 102 106 120 130 MID 16 102 108 115 125 131 139 HIGH 20 125 131 136 141 144 147 The ...

Page 52: ...8 12 118 13 127 15 147 Setting Value 32 01 32 02 32 03 32 04 32 05 32 06 32 07 32 08 32 09 32 10 32 11 UM30R N10 LOW 18 96 102 107 110 114 118 122 125 127 130 132 MID 20 102 110 114 118 121 125 127 130 133 134 136 HIGH 22 110 117 121 124 127 130 133 136 137 138 140 Model Step CMM Static Pressure mmAq Pa 4 39 5 49 6 59 7 69 8 78 9 88 10 98 11 108 12 118 13 127 15 147 Setting Value 32 01 32 02 32 03...

Page 53: ...3 5 CMM 82 90 99 109 119 11 5 CMM 75 84 93 103 114 17 CMM 110 117 125 129 15 CMM 100 107 115 121 127 13 5 CMM 90 97 105 114 122 AMNH09GB1A2 MB09AHL N12 AMNH12GB1A2 MB12AHL N12 AMNH18GB2A2 MB18AHL N22 AMNH24GB2A2 MB24AHL N22 E S P setting value reference 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 ...

Page 54: ...ll exit settings mode After setup it automatically gets out of setup mode if there is no button input for 25 seconds When exiting without pressing set button the manipulated value is not reflected This function is to adjust FAN Airflow rate according to ceiling height For ceiling type product Ceiling height setting is available only for some products Ceiling height of Very high function may not ex...

Page 55: ...When the dehumidification operation input by the remote control is received the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature While compressor off the indoor fan repeats low airflow speed and stop While the intake air temp is between compressor on temp and compressor off temp 10 min dehumidification opera tion and 4 min compres...

Page 56: ...n the load condition The difference between the room temp and set temp frequency restrictions If compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 seconds Condition of compressor turned off When intake air temperature reaches 4 C above the setting temperature Condition of compressor turned on When intake air temperature reaches 2 C above the se...

Page 57: ...compressor is turned off When 0 5 C or more above the setting temp the compressor is turned on Compressor ON Temp Setting Temp 0 5 C Compressor OFF Temp Setting Temp 0 5 C At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 26 C Intake Air Temp 25 C 24 C Intake Air Temp 26 C Intake Air Temp 1 C 22 C Intake Air Tem...

Page 58: ...peration for Heating According to the setting temperature selected by Fuzzy rule when the intake air temp is 3 C or more above the setting temp the compressor is turned off When below the setting temp the compressor is turned on Compressor ON Temp Setting Temp Compressor OFF Temp Setting Temp 3 C At the beginning of Fuzzy mode operation the setting temperature is automatically selected according t...

Page 59: ...the ON OFF button is pressed If you want to stop operation re press the button Indoor temp over 24 C 21 24 C below 21 C Setting temp 22 C 23 C 24 C Setting speed of indoor fan High speed Operating Mode Cooling Healthy Dehumidification Heating It is the function to use preventing children or others from careless using Press button repeatedly until the is flashing 1 If moving to setup icon area by u...

Page 60: ...nction with one remote controller you must change the master slave setting from the indoor unit Indoor units the master slave configuration of the product after completion of indoor unit power OFF and then ON the power after 1 minutes elapsed sign up For ceiling type cassette and duct product group change the switch setting of the indoor PCB For wall mount type and stand type product change the ma...

Page 61: ...ontrol the appliance starts to operate The timer LED is on when the on timer is input It is off when the time set by the timer is reached If the appliance is operating at the time set by the timer the operation continues While in Fuzzy operation the airflow speed of the indoor fan is automatically selected according to the temperature 6 9 2 Off Timer Operation When the set time is reached after th...

Page 62: ...ettings mode After setup it automatically gets out of setup mode if there is no button input for 25 seconds When exiting without pressing set button the manipulated value is not reflected h The function of 2TH has different operation characteristics according to the product Thermistor Table This is the function to select the temperature sensor to judge the room temperature Temperature sensor selec...

Page 63: ...ding any space environment 7 3 Auto Elevation Grille Auto Elevation Grille is automatically down to height of max 3 1 m So it enables to install the Indoor unit at high ceiling space And Auto Elevation Grille makes you cleaning the filter easily 7 1 Low Ambient control This Function is for cooling operating in outdoor low temperature If outdoor temperature drops below certain temperature liquid ba...

Page 64: ... directly under front panel Do not drop it down or into water Or else there is worry about trouble failure Do not press hard the Remote Controller button with nail ball point pen or other sharp substance Or else there is worry about trouble failure In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval Remote Controller operation is infeasib...

Page 65: ...tic Stop Distance of Grill Ceilingheight Low Medium High Height 3 4m Automatic stop distance 1 5 0 5m 2 5 0 5m 3 5 0 5m Depress the down button Then suction grill descends and stops automatically at a certain distance You may stop it at wanted distance point by depressing the stop but ton when descending Depress the up button Then suction grill goes up and enters into the front panel 1 Stop the Ai...

Page 66: ...cs Inc All rights reserved Only training and service purposes Part 2 Functions Controls 3 Basic Control 1 Normal operation 66 2 Compressor control 66 3 EEV Electronic Expansion Valve control 66 4 Oil return control 67 5 Defrost control 67 ...

Page 67: ...ting operation Stop state Compressor Fuzzy control Fuzzy control Stop Fan Fuzzy control Fuzzy control Stop EEV Super heating fuzzy control Super heating Sub cooling fuzzy control Min Pulse EEV operates with fuzzy control rules to keep the degree of superheat about 2 3 at the evaporator outlet status The degree of superheat Tsuction Tevaporation Tsuction temperature at suction pipe sensor Tevaporat...

Page 68: ...control Component Starting Running Ending Compressor Normal control Setting value Normal control Fan Normal control Off Normal control EEV Thermo on Normal control Setting value Normal control EEV Thermo off Min Pulse Setting value Min Pulse 4 way valve On Off On Component Starting Running Ending Fan Normal control Off Normal control Defrost signal Off On Off Outdoor unit Indoor unit Component Sta...

Page 69: ... 68 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes 4 Test Run 4 Test Run 1 Check before Test Run 69 2 Test Run Flow chart 70 3 Test Running 71 ...

Page 70: ...power supply terminal block and ground Do not operate in the case of 2 0 MΩ or less NOTE Never carry out mega ohm check over terminal control board Otherwise the control board may break Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx 2 0 MΩ...

Page 71: ... to part4 6 Electric part Yes No Yes Refer to part4 5 Cycle part No Is hot air discharged After Hot Start Yes No Is there any temperature difference between intake and discharged air Yes No Is the operating current normal Yes Normal Refer to Troubleshooting Guide No Check the load In Out Temp Check pipe length and amount of refrigerant Check for abnormal sound in outdoor unit comp Fan others 2 Tes...

Page 72: ...5 minutes without fail Test run will be cancelled 18 minutes later auto matically n The forced operation is started by pressing button for 2 seconds The test run is started by pressing button for 3 6 sec onds n To cancel the test run press any button 3 1 3 Settlement of outdoor unit n Anchor the outdoor unit with a bolt and nut ø10mm tightly and horizontally on a concrete or rigid mount n When ins...

Page 73: ...tate 2 In case the indoor unit is installed under the ceiling please change the slide switch which is on the Main PCB Assembly to the CEILING state h The initial state of the slide switch is set for the bottom installation 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 pr...

Page 74: ...button for 3 seconds at the same time To cancel the test run press any button 3 3 2 CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE After completing work be sure to measure and record trial run properties and store measured data etc Measuring data are room temperature outside temperature suction temperature blow out temperature air velocity air volume voltage current presence of abnormal v...

Page 75: ... 2 1 14k 16k 77 2 2 18k 56k 78 3 Evacuation 79 4 Gas Charging 80 5 Cycle Part 81 6 Electronic Parts 82 6 1 The Product doesn t operate at all 82 6 2 The Product doesn t operate with the remote controller 83 6 3 The Compressor Outdoor Fan are don t operate 84 6 4 When indoor Fan does not operate 85 6 5 When the louver does not operate 86 6 6 Troubleshooting Indoor Error 87 6 7 Troubleshooting Outdo...

Page 76: ...d error LED is also released simultaneously To operate again on the occurrence of error code be sure to turn off the power and then turn on Having or not of error code is different from Model Indoor Error N O r o r r E o N 0 0 F F O r o r r e r o t s i m e h t m o o R r o o d n I 1 0 F F O r o r r e r o s n e s g n i p i p n i r o o d n I 2 0 F F O r o r r e r e l l o r t n o c e t o m e R 3 0 F F...

Page 77: ...ipe Temp High Off 35 Low Pressure Error 3times 5times Excessive decrease of Low Pressure Off 39 Communication Error 3times 9times Communication Error Between PFC Micom and INV Micom Off 40 CT Sensor Open Short 4times CT Circuit Malfunction Off 41 INV D Pipe Th Error 4times 1times Open Short Off 43 High Pressure Sensor Error 4times 3times Open Short Off 44 Outdoor Air Th Error 4times 4times Open Sh...

Page 78: ... service port 4 Air purging of the charge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the 2 way valve to the closed position 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indi cating 3 to 5kg c...

Page 79: ...d cooling operation CAUTION 1 Use pump down function within guaranteed temperature range IDU 20 32C ODU 0 40C 2 Make certain that IDU doesn t run with thermo off mode during operation 3 After the compressor is starting operation please complete Pump Down within 4 minutes 4 Pump Down can be stopped The compressor is turned off because of compressor protection In this case reset the power 1 2 3 4 5 ...

Page 80: ...hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed WARNING Use a vacuum pump or lnert nitrogen gas when doing leakage test or air purge Do not compress air or Oxygen and do not use Flammable gases Otherwise it may cause fire or explosion Otherwise it may cause personal injury Lo Open Open Vacuum pump 3 Way valve Outdoor unit Liquid side I...

Page 81: ...at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be discharged If the system has been charged with liquid refrig erant while o...

Page 82: ...n intake and discharge air depends on room air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger 2 Check temperature and pressure of refrigeration cycle in cooling mode 1 The suction pressure is usually 8 5 9 5kg cm2G Cooling at normal condition R410A 2 The temperature can be me...

Page 83: ...k the power outlet 2 Replace PCB Assembly 4 Replace PCB Assembly 5 Replace PCB Assembly Turn on the main power again Turn off the main power and wait for 10 seconds Yes No A Beeping sound is made from the indoor unit Check the voltage of power supply AC220V AC240V 50Hz and check for the following The voltage of main power supply The voltage applied to the unit The connecting method of Indoor Outdo...

Page 84: ...om the indoor unit Refer to 10 1 Check the voltage of power AC220V AC240V 50Hz Is it possible to turn on the unit by ON OFF button on display Yes No Is the remote controller working properly Yes When the mark is displayed in LCD screen replace battery No Check the contact point of CN DISP 1 2 connector Re connector Check display PCB Assembly Voltage between CN DISP1 should be DC 5V If problem stil...

Page 85: ...nection or are not engaged Compressor Outdoor fan is stopped Check the related circuit of R02H 12 1K R01H 1K R04H 6 2K R03H 1K C01H 102 C02H 102 Micom pin No Check the Indoor temperature sensor is disconnected or not about 10K at 25 C Check the Relay RY PWR RY START for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240V Check the ...

Page 86: ...heck the connection of CN FAN Check the Fan Motor Check the Fuse AC250V T2A Turn on the main power Check the related circuit of indoor Fan Motor The pin No 38 of micom and the part for driving SSR Q01M Check the related pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF The voltage of Pin No 1 orange and 3 black of CN FAN A...

Page 87: ...heck the soldering condition on PCB of CN U D or CN0L R Connector Check the operating circuit of the vertical louver Confirm that there is DC 12V between pin of CN U D CN0L R and GND Confirm that there is a soldering short at following terminals Between 1 2 3 and 4 of MICOM Between 17 18 19 and 20 of MICOM Between 4 5 6 and 7 of IC01M Between 5 6 7 and 8 of IC01M 6 5 When the louver does not opera...

Page 88: ...or 10 C 20 7 kΩ 25 C 10 kΩ 50 C 3 4 kΩ Pipe temp sensor 10 C 10 kΩ 25 C 5 kΩ 50 C 1 8 kΩ Is sensor properly connected to PCB Is the resistance value of sensor normal Connect properly to PCB Change the sensor Change the PCB Yes Yes No No CN_PIPE_IN Pipe inlet temp sensor CN_PIPE_OUT Pipe outlet temp sensor CN_ROOM Indoor air temp sensor Measure the resistance of outlet pipe temp sensor Error No Err...

Page 89: ...he error happens again if the remote controller is replaced Does the error occurred when the cable of remote controller is replaced Replace cabled remote controller Check connection communication cable Replace indoor unit PCB Yes Yes No No If there is no remote controller to replace Use another unitʼs remote controller doing well Check cable Contact failure of connected portion or extension of cab...

Page 90: ...evel 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 DC 15V output Replace indoor unit PCB Replace Drain Pump Yes Check the drain h...

Page 91: ... All rights reserved Only training and service purposes Indoor PCB drain pump connector Check input of DC 15 V Marked as CN_DCDRAIN float Point to check rotating Float switch Housing CN_FLOAT Standard of drain pipe head height slope MAX 450 MAX 700 mm 1 50 1 100 ...

Page 92: ... occur in EEPROM of the Indoor PCB 1 Error developed in communication between the micro processor and the EEPROM on the surface of the PCB 2 ERROR due to the EEPROM damage 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 6 6 Troubleshooting Indoor Error CH 09 Indoor unit EEPROM error ...

Page 93: ...es 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 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 hundreds kΩ hundreds kΩ Normal Resistance 10 Replace the indoor unit PCB and then make sure to do Auto addressing...

Page 94: ...ault EEV Electric Expansion Valve fault fault of a temperature sensor or its con nection blocking of an indoor device ﬁlter and bending blocking of a pipe Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the pipe or panel damage of compressor with abrasion and compressor connection fault PCB As sembly IPM part fault fault signal detecti...

Page 95: ... state Checking outdoor fan operating condition Checking sensor fault Checking Compressor phase resistance Checking single unit of IPM Checking pipes For bending blocking Checking 4 way valve Checking compressor Insulation resistance Checking Compressor current detection circuit Checking EEV for motion Checking DC link voltage Single power source Checking whether the power is AC 187 276 V 3 phase ...

Page 96: ...eral suction point on the wall of the outdoor devices Foreign substances in the heat exchanger and obstacles in the surrounding Frequent turning off of the compressor Elevation of the pipe temperature due to reduced wind velocity Wrong inﬂuence to the system in over load state Corrosion Possible inﬁltration of moisture highly humid area Corrosion of heat exchanger Reduced opera tion efﬁciency Tran...

Page 97: ... turning on off of the compressor by the high low pressure protection logic Accumulated refrigerant elevates the tem perature and reduces the pressure Wrong oil collection elevates the outlet tem perature of the compressor and damages the compressor Bending Blocking of a pipe Checking SVC Valve Bending of a pipe OPEN Check pipes SVC Valve Check EEV Check Replacing a part of or the entire pipes SVC...

Page 98: ...t of compressor phase Replace the compressor 4 Refer to the compressor resistance standards 5 If any disorder is found measure the line resistance between the terminals of the compressor as shown below 6 If the compressor is found to be normal any compressor connection wire may have a fault Terminal Insulation Resistance U panel 10 MΩ V panel 10 MΩ W panel 10 MΩ Compressor terminals Compressor ter...

Page 99: ... 3 Wiring Check How to check the compressor wiring error Check whether the PCB wires and compressor wires are connected in the same colors Check whether the PCB wires and compressor wires are connected in the same colors Y Y Yellow B Blue R Red Y B B R R Picture of normal compressor wiring Picture of normal compressor wiring Check whether the compressor wires are properly connected with U V and W ...

Page 100: ...ode Mode 1 Remove the connector from PCB 2 Set the Multi Tester as Diode Voltage Measurement Mode 3 Measure the voltages of P U P V P W as shown in Fig 1 4 Measure the voltages of U Nu V Nv W Nw as shown in Fig 2 5 If the measurements are significantly different from the levels shown in the figures the IPM is deemed to be damaged IPM Check 0 3 V 0 5 V 0 3 V 0 5 V 0 3 V 0 5 V 0 3 V 0 5 V 0 3 V 0 5 ...

Page 101: ...of PCB assembly Items for checking 1 Judgment of damage of IGBT 2 Checking the soldering state IPM Check Point IPM Pin Arrangement and Pin Numbers Step Flow of Inspection 1 Turn the power off wait until the outdoor device LED is turned off 2 Remove compressor wires 3 Measure the voltage as shown in the ﬁgure 4 Check the voltage for being in the range of 0 3 0 5V 5 Judge IPM Pins for short ...

Page 102: ...l rights reserved Only training and service purposes 5 Trouble Shooting IPM Check Point 4 kW 4 kW 25 26 27 29 30 32 33 P W V U Nw Nv Nu 33 32 30 29 27 26 25 U1 IPM Check Point 17 18 19 20 21 22 23 24 17 18 19 20 21 22 23 24 Division IPM Check Point ...

Page 103: ... rights reserved Only training and service purposes Division IPM Check Point 6 kW 4 5kW IPM Check Point P W V U N w N v N u 25 26 27 29 30 32 33 Nu U V W Nv Nw P IPM Pin Arrangement and Pin Numbers 27 28 29 30 31 32 33 33 P U N 27 28 29 30 31 32 COMP_IPM W V Nu Nv Nw ...

Page 104: ...purposes RED BLACK T S R T DC_Link IGBTM GND P U V W 7 kW U3 Check Point Multi Meter Measured value Mode BLACK RED Normal Abnormal IGBTM High side Didoe DC_Link R 0 35 V 0 7 V Non normal S T IGBTM Low side Didoe R IGBTM GND S T IGBTM Hige side IGBT P U V IGBTM Low side IGBT W U IGBTM GND V W n IPM Check Point ...

Page 105: ... 2 5 V 0 2 V 4 If the measurement is different from the standard replace PCBA Caution When the measurement is made in the state that the electricity is applied check the tester for being in the measurement mode and be careful to avoid possible short of the parts other than the measuring part Apply the electricity Turn indoor devices off Measure voltage Replace PCBA Current detection part is normal...

Page 106: ...oting 105 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Compressor Phase Current Detection Division 2 5 kW 4 kW Current Detection Circuit Check Point GND Comp Current ...

Page 107: ...t 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Compressor Phase Current Detection Division 4 kW Current Detection Circuit Check Point Vdc 2 5 V GND Red Black INV_Current INV_Current INV_Current ...

Page 108: ...ng 107 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Compressor Phase Current Detection Division 6 kW 7 kW Current Detection Circuit Check Point Inverter Current GND_INV ...

Page 109: ...rt heating mode operation and at the time of standby after operation Checking the output voltage of CN 4way refer to next page Check the 4 way valve coil resistance 1 Set the tester in AC Voltage Mode and check the voltage 2 Check the output voltage between both ends of CN 4Way Connector 3 The standard of normal voltage is 220 V 10 4 If the measurement is different from the standard replace PCBA 1...

Page 112: ...5 Trouble Shooting 111 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes LGMV Display When Heating LED turn on When Cooling LED turn off ...

Page 113: ...t 2 Measure the resistance between eth Pins of EEV Connector 3 For the measurement method and normal standard refer to the Table There may be the difference in the resistance depending upon the EEV Specifications RD 1 2 BL 3 OR 4 YL 5 WH 6 Pin No RD 1 BR 2 BL 3 OR 4 YL 5 WH 6 Pin No Measurement Pin Normal Standard 1 3 45Ѥ 5Ѥ 1 4 45Ѥ 5Ѥ 1 5 45Ѥ 5Ѥ 1 6 45Ѥ 5Ѥ Measurement Pin Normal Standard 1 4 45Ѥ ...

Page 114: ... standard of normal voltage measurement is 2 4 2 8 V 4 If the measurement is different from the standard replace PCBA Caution When the measurement is made in the state that the electricity is applied check the tester for being in the measurement mode and be careful to avoid possible short of the parts other than the measuring part Apply the electricity Turn indoor devices off Measure voltage Repla...

Page 115: ...eserved Only training and service purposes DC Link Detection Circuit Check Point Division 2 5 kW 4 kW 4 5kW DC Link Detection Circuit Check Point GND DC_ Link Red Black GND GND DC_LINK DC_LINK 1 Check DC Link Sensing Signal measurements at Power on standby state DC 2 4 2 8 V ...

Page 116: ...g 115 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes DC Link Detection Circuit Check Point Division 6 kW 7 kW DC Link Detection Circuit Check Point DC Link_Voltage GND_INV ...

Page 117: ...116 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes DC Link NG Voltage level DC Link NG Voltage level Controller Voltage 2 4 kW 140 V Controller Voltage 6 kW 140 V 7 kW 380 V ...

Page 118: ...Causes Installation Overload Installation fault closing of SVC valve under over charging with refriger ant inﬁltration of water into refrigerant outdoor device shielding outdoor fan fault EEV valve fault and sensor fault or assembling error Compressor Short between compressor coil and Panel abrasion of compressor and short opening of compressor coil PCB Assembly Input current detection circuit fau...

Page 119: ...outdoor devices for shielding Checking refrigerant for over shorts Checking compressor wiring Checking input current detection circuit Checking power connection state Checking outdoor fan operation Checking compressor Phase resis tance Checking pipes for Bending blocking Checking compressor insulation resistance Checking EEV for motion Check for AC190 260 V Check the manifold gauge pressure Flow o...

Page 120: ...andard of normal voltage measurement is 2 5 V 0 2 V 4 If the measurement is different from the standard replace PCBA Caution When the measurement is made in the state that the electricity is applied check the tester for being in the measurement mode and be careful to avoid possible short of the parts other than the measuring part Apply the electricity Turn indoor devices off Measure voltage Replac...

Page 121: ...hooting 120 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Vdc 2 5 V Input Current Detection Point Division 2 5 kW 4 kW 4 5 kW GND Input_I I_IN I_IN GND GND Red Black ...

Page 122: ...5 Trouble Shooting 121 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Compressor Phase Current Detection Division 6 kW 7 kW Input Current GND_INV ...

Page 123: ...22 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes LGMV Display DC Link NG Voltage level Controller Current Level 2 5 kW 14 A 4 kW 19 A 6 kW 29 A 7 kW Cooling 12 A Heating 13 A ...

Page 124: ... the generation of over current at the compressor part in the DC Link Low Voltage condition Condition for Generation Detected DC Link Voltage is less than the standard Expected Causes Installation Installation fault and input of low voltage power PCB Assembly Damage of DC link voltage detection circuit and reactor terminal connection error 6 7 Troubleshooting Outdoor Error CH 23 DC Link Voltage Lo...

Page 125: ...wer source Installation Checking PCBA Checking input voltage Checking the wire coating of power source Checking reactor connection state Checking power connection state Checking DC Link voltage charging circuit Check for AC 190 260 V Check the wire for possible coat chopping and short Flow of trouble diagnosis 6 7 Troubleshooting Outdoor Error CH 23 DC Link Voltage Low ...

Page 126: ...LG Electronics Inc All rights reserved Only training and service purposes Reactor Connector Point Division 2 5 kW 4 kW 4 5 kW 6 kW 7 kW Checking Reactor Connection OUT OUT IN IN OUT IN 6 7 Troubleshooting Outdoor Error CH 23 DC Link Voltage Low ...

Page 127: ...s PFCM Point Division 4kW PFCM Point Red Black Vdc Sequence of Measurement Measurement Normal Standards Sequence of Measurement Measurement Normal Standards 1 C E 0 3 V 0 5 V 2 C E 0 3 V 0 5 V ڹ ڸ 0 3 0 5 V IGBT ڸ ڹ ڸ ڹ C Collector E Emitter 1 A C 0 3 V 0 5 V 2 A C 0 3 V 0 5 V FRD A Anode C Cathode ڸ ڹ IGBT IGBT FRD ...

Page 128: ...ent Mode 3 Measure the voltage as shown in Fig 1 4 Measure the voltage as shown in Fig 2 5 If the measurements are significantly different from the levels shown in the figures the Bride Diode is deemed to be damaged Checking Discrete PFC PCBA 4 5kW 6kW Fig 1 0 4 0 6 V Black Red Sequence of Measurement Measurem ent Normal Standards 1 0 4 V 0 6 V 2 0 4 V 0 6 V Sequence of Measurement Measurem ent No...

Page 129: ...5 Trouble Shooting 128 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Division PFCM Point 6 kW 4 5 kW B Diode of Discrete PFC Point B D ...

Page 130: ... service purposes RED BLACK T S R T DC_Link IGBTM GND P U V W Check Point Multi Meter Measured value Mode BLACK RED Normal Abnormal IGBTM High side Didoe DC_Link R 0 35 V 0 7 V Non normal S T IGBTM Low side Didoe R IGBTM GND S T IGBTM Hige side IGBT P U V IGBTM Low side IGBT W U IGBTM GND V W 7 kW U3 ...

Page 131: ...tive high pressure switch 2 Defective fan of indoor unit or outdoor unit 3 Check valve of compressor clogged 4 Pipe distortion due to the pipe damage 5 Refrigerant overcharge 6 Defective EEV at the indoor or outdoor unit 7 Covering or clogging Outdoor covering during the cooling mode Indoor unit filter clogging during the heating mode 8 SVC valve clogging 9 Defective outdoor PCB Purpose Excessive ...

Page 132: ...ure 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 connecting cable Open SVC valve No Yes Is high pressure switch terminal short No Replace high pressure switch Yes Is high pressure more than 4 000 kPaG at manifold gauge No Replace PCB Yes Is high pressure of LGMV similar as at manifold g...

Page 133: ...ics Inc All rights reserved Only training and service purposes Note1 Check Point UU09 12WR UU18WR UU24WR 2 5 kW 3 4 kW U24A 4 kW UU36 42 48 60WR UU37 43 49 61WR 6 7 kW Main 6 kW Inv 7 kW Inv Note2 Check Point High pressure switch Normal Short Abnormal Open ...

Page 134: ... Installation Overload Closing of SVC valve under over charging with refrigerant inﬁltration of water into refrigerant outdoor device shielding outdoor fan fault EEV valve fault and sensor fault or assembling error Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the sash damage of compressor with abrasion and compressor connection faul...

Page 135: ...orts Checking compressor wiring Checking power connection state Checking outdoor fan operation Checking compressor phase resis tance Checking pipes for Bending blocking Checking compressor insulation resistance Checking EEV for motion Check for AC 190 260 V Manifold gauge Flow of trouble diagnosis Checking IPM connection state Checking single unit of IPM Checking Compressor current detection circu...

Page 136: ...ansfer of signals with detection of the ﬂow of over current in PSC PFC Outdoor device shielding Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the sash damage of compressor with abrasion and compressor connection fault PCB Assembly Damage of PSCM PFCM and input current detection circuit fault Others Input of abnormal power power conne...

Page 137: ...gerant for over shorts Checking compressor wiring Checking power connection state Checking reactor Terminal connection Checking outdoor fan operation Checking compressor phase resistance Checking pipes for Bending blocking Checking compressor insulation resistance Checking EEV for motion Check for AC 190 260 V Check the reactor terminal insertion state Manifold gauge Flow of trouble diagnosis Chec...

Page 138: ... 3 Measure the voltage as shown in Fig 1 4 Measure the voltage as shown in Fig 2 5 If the measurements are significantly different from the levels shown in the figures the IGBT FRD is deemed to be damaged Checking Discrete PFC part Sequence of Measurement Measurement Normal Standards Sequence of Measurement Measurement Normal Standards 1 C E 0 3 V 0 5 V 2 C E 0 3 V 0 5 V IGBT C Collector E Emitter...

Page 139: ...gerant for over shorts Checking compressor wiring Checking power connection state Checking reactor Terminal connection Checking outdoor fan operation Checking compressor phase resistance Checking pipes for Bending blocking Checking compressor insulation resistance Checking EEV for motion Check for AC 190 260 V Check the reactor terminal insertion state Manifold gauge Flow of trouble diagnosis Chec...

Page 140: ... 3 Measure the voltage as shown in Fig 1 4 Measure the voltage as shown in Fig 2 5 If the measurements are significantly different from the levels shown in the figures the IGBT FRD is deemed to be damaged Checking Discrete PFC part Sequence of Measurement Measurement Normal Standards Sequence of Measurement Measurement Normal Standards 1 C E 0 3 V 0 5 V 2 C E 0 3 V 0 5 V IGBT C Collector E Emitter...

Page 141: ...eeding the standard Expected Causes Installation Installation fault closing of SVC valve under over charging with refriger ant and inﬁltration of moisture into refrigerant Overload Outdoor device shielding outdoor fan fault and EEV valve fault Compressor Short between compressor coil and sash abrasion of compressor and short opening of compressor coil PCB Assembly Compressor current and DC link vo...

Page 142: ...tage Checking outdoor devices for shielding Checking under over charging with refrigerant Checking compressor wiring Checking outdoor fan operation Checking compressor phase resistance Checking pipe blocking Checking compressor insulation resistance Checking the work of EEV Check for AC 190 260 V Refer to manifold gauge Flow of trouble diagnosis Checking outset Temperature sensor 6 7 Troubleshooti...

Page 143: ...of compressor due to excessive low pressure Condition for Generation The low pressure of outdoor unit is decreased excessively Expected Causes Installation Lack and leakage of refrigerant Service valve clogged in case of deformation or shielding by refrig eration pipe damage outdoor unit shielding during heating indoor filter clogging during cooling PCB Assembly Outdoor unit PCB defect Sensor Low ...

Page 144: ...r unit PCB replace the check low pressure sensor Change the refrigerant amount insert additional refrigerant Is the communication line pipe connection normal Open the service valve Change communication line pipe Flow of trouble diagnosis Note 1 If the temperature difference between before after strainer is severe and frozen state is visually verified or if the temperature difference is verified st...

Page 145: ...ower Module The part to control the inverter compressor Items Contents Purpose Possible damage of compressor due to refrigerant leakage or lack Condition for Generation If refrigerant is insufficient or if refrigerant is leaked Expected Causes Installation Refrigerant leakage insufficient Service valve locked Pipe bending defect Sensor Sensor defect Others EEV connector falling off EEV assembly de...

Page 146: ...refrigerant is insufficient refill refrigerant Is each temperature sensor normal Check pipe bending or problem Check service valve locking This error occurs only in some models Items for checking Sub items for checking Action Remove cause of the problem Action Replace the sensor Action Assemble replace EEV Action Take action in the leakage part and refill refrigerant Sensors to check indoor temper...

Page 147: ...g temperature value from the tempera ture sensor Condition for Generation Damage of temperature sensor Short Open Classiﬁcation Causes in Detail PCB Assembly Connector open damaged insulation of sash damage of the wire coat ing of temperature sensors Code No Details of Errors 41 Inverter Discharge temperature sensor Open Short 43 High pressure Sensor Error 44 Outdoor air temperature sensor Open Sh...

Page 148: ...stance by sensor temperature Position Outlet of compressor Sensor value 200 kΩ 10 Based on 25 Position Rear part of outdoor device Sensor value 10 kΩ 10 Based on 25 Position Compressor inlet and pipe Sensor value 5 kΩ 10 Based on 25 ڸ Compressor discharge sensor ں Outdoor temperature sensor ڹ Pipe sensor 200 Ω 5 Ω 5 Ω Compressor inlet sensor Pipe sensor 10 Ω Sensor Checking Methods 6 7 Troubleshoo...

Page 149: ...cooling mode In case of UU09WR UU12WR Model check the ejection of Sub PCB ڻ Pressure sensor After power supplied the pressure on LGMV is normal before operating Voltage of 5V is output from the PCB The location and connection of connector is normal on PCB PCB checking and replacement Reconnection Replace the pressure sensor Checking start No malfunction of the pressure sensor Yes Yes Yes No No No ...

Page 150: ...n of installation of indoor devices exceeding the capacity of outdoor device Condition for Generation Connection of indoor devices exceeding the guaranteed capacity of outdoor device Re installation of products Judgment Method Same capacity ok Indoor capacity Outdoor capacity NG 6 7 Troubleshooting Outdoor Error CH 51 Indoor Device Connection Error ...

Page 151: ...ndition for Generation Resetting power source Wait for 3 minutes after turning the power of the product off Items for checking Sub items for checking Resetting power source Connector Insufﬁcient insertion of housing Damage of wire coating Check the Heat sink and Chassis Panel Checking power source LED Off Damage of wire coating Replacement of inverter PCB Replacement of main PCB It should not be s...

Page 152: ...ication Items for checking Checking method of faulty points ڸ Insufﬁcient insertion of wires ڹ Damage of wire coating Interference with wires or wire coating damage with chopping ں Inverter PCB LED Replacement of inverter PCB during LED Off after resetting OK NG OK NG Environment interfering PCB communication 6 7 Troubleshooting Outdoor Error CH 52 PCB Communication Error ...

Page 153: ...source Wait for 3 minutes after turning the power of the product off Items for checking Sub items for checking Resetting power source Outdoor PCB Installation Replacing indoor PCB Check LGMV Communication rate Grounding Wire tongue termination Communication cable length No power Insert Connector Wire connection state Communication cable length Checking for LED Off Normal Operation If length is 50 ...

Page 154: ... kW ڸ Check reactor connection state ڹ Check fuse state ں Check whether outdoor PCB LED is lighted Purpose Checking whether outdoor PCB is normal Items for checking Lighting of LED fuse damage and reactor connection error Checking Method of Outdoor PCB 6 7 Troubleshooting Outdoor Error CH 05 53 Indoor Outdoor Device Communication Error Detection by indoor devices ...

Page 155: ...to wire ethod In case of additional connection connect the wires with soldering as shown below ڹ Wire tongue termination fault ں The cut section of the wire passes the insulation tape and causes a short with another wire ڻ Communication noise by oxidized wire arrangement Soldering is required Wire to Wire Neutral Neutral Installation environment interfering with the communication of indoor outdoor...

Page 156: ... Live should be infinite Check resistance Communication Netural should be infinite Check resistance Communication Gnd should be infinite When Input AC 220 V Check AC 220 V Live Netural Indoor Outdoor Otherwise arrange the Communication Wire Check AC 220 V Equipment Multi Meter Test Mode AC Voltage Indoor Outdoor Terminal block Equipment Multi Meter Test Mode Resistance Check Voltage Input of AC 22...

Page 157: ...cation Line and Pipe After Removing Power Line Wire and Communication Line Wire Check the voltages Check Infinite Resistance between Power Communication Line and Pipe Line N L C Ω Pipe N L C Ω Pipe Check Resistance and Pipe Line Check Resistance Live and Pipe Check Resistance Neutral and Pipe N L C Ω Pipe Check Resistance Communication Line and Pipe ...

Page 158: ... Electronics Inc All rights reserved Only training and service purposes Communication rate Normally 90 ƣ Check LGMV Communication rate 6 7 Troubleshooting Outdoor Error CH 05 53 Indoor Outdoor Device Communication Error Detection by indoor devices ...

Page 159: ...nication status are not on or not blinking in outdoor inverter PCBA 2 Causes Noise disturb the outdoor unit communication with indoor unit 3 Improvement Inserting small connector with capacitor in Inverter PCBA of Outdoor Unit 1 Connector can be applied to the list PCBA P No on the next page 2 Guide where you put it on the next page It helps outdoor unit communicate with indoor unit better than be...

Page 160: ...nstant rate compressor Main power wiring fault Condition for Generation Resetting power source Wait for 3 minutes after turning the power of the product off Items for checking Sub items for checking Installation Checking N phase Checking for open and reverse phase Fuse damage R and S phases AC load Inverter PCB Checking for power phase loss 6 7 Troubleshooting Outdoor Error CH 54 Open and Reverse ...

Page 161: ... ڹ ڸ R S T N R S T N R S T N R S T N R S T N R S T N 380 Vac 380 Vac N phase 380 Vac 220 Vac N phase ں ڻ N phase unavaila ble N phase unavaila ble N phase unavaila ble N phase availab le ں ڻ R S T N R S T N R S T N R S T N R S T N R S T N 220 Vac 220 Vac N phase 220 380 Vac N phase N phase availa ble N phase availa ble Vac N phase availa ble N phase unavaila ble 6 7 Troubleshooting Outdoor Error C...

Page 162: ...generate voltage was upgraded Power module requires checking Operation with replacement of R and S phases only Brown B Black Green Brown B Black Green R S T N R S T N Br k c a l B B n w o Green Brown B Black Green R S T N R S T N R S T N Vac Vac Vac Vac Vac Vac Judgment Method of R S T phase loss Judgment method of open and reverse phase of R S T 6 7 Troubleshooting Outdoor Error CH 54 Open and Re...

Page 163: ...turning the power of the product off How to check the EEPROM assembling state of outdoor devices ڸ Check the direction of EEPROM Shape of marking line and direction of EEPROM ڹ Check whether EEPROM is perfectly adhered ں Check whether EEPROM lead is put out of the outlet Items for checking EEPROM IC containing the operation data suitable to the product Sub items for checking Power Source Prompt ge...

Page 164: ...le Shooting 163 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Division EEPROM Position 4 kW 4 5 kW 6 kW Inv 6 7 kW Main 7 kW Inv EEPROM Inverter PCBA EEPROM PCBA ...

Page 165: ...onment cycle disorder and sensor unit fault Condition for Generation Resetting power source Wait for 3 minutes after turning the power of the product off Installation Cycle Sensor Replacing PCB Whether to shield Pipe blocking Properties of unit Checking service valve for opening Checking EEV for proper working Checking refrigerant for leakage or overcharging Checking fan for working 6 7 Troublesho...

Page 166: ...and PSCM PFCM Heat sink temperature reaches the limit level Condition for Generation Resetting power source Wait for 3 minutes after turning the power of the product off Items for checking Sub items for checking Installation Whether to shield Outdoor Fan Restoration of temperature Checking for proper working Checking for proper working Replacing PCB 6 7 Troubleshooting Outdoor Error CH 62 Heat sin...

Page 167: ... Inc All rights reserved Only training and service purposes Heatsink High NG Temperature level Controller Temperature level 95 C ƣ 85 C ƣ 4 kW Ƥ 95 C ƣ 4 5 kW 6 kW 7 kW 125 C ƣ Check LGMV for CH 62 6 7 Troubleshooting Outdoor Error CH 62 Heat sink High Error ...

Page 168: ...ing Working Temperature Outdoor Temperature Replacing PCB Environmental factor checking method 1 The products works when outdoor temperature is 20 2 Generation of CH65 case 10 minutes after the operation of the product If both of above stated conditions are satisfied environmental factor is the cause Sensor checking method 1 Power Off 2 Measure the resistance using a tester 3 Measure the resistanc...

Page 170: ...Assembly Damage of fan motor driving circuit CH67 Cause of Generation Trouble Checking Flow Cautions Sub items for checking Outdoor Fan Outdoor fan damage Checking Single unit of Fan IPM Connection state PCBA 1 Both the fan and PCB may be damaged when the fan connector is mounted or removed in the state that the power is supplied 2 Both the fan and PCB may be damaged when the fan connector is inse...

Page 171: ...fan Please turn Fan if fan is turn ok 3 Check the terminal 4 Check the Motor Refer to the below Checking wire terminals for possible short How to check the outdoor fan motor of BLDC Tester Normal resistance 10 ڸ ڼ Dozens kΩ hundreds kΩ Dozens kΩ hundreds kΩ ڽ ھ ڻ ڻ ڻ ڻ Dozens kΩ hundreds kΩ Dozens kΩ hundreds kΩ Checking Fan motor 6 7 Troubleshooting Outdoor Error CH 67 Fan Lock ...

Page 172: ...Remove the connector from PCB 2 Set the Multi Tester as Diode Voltage Measurement Mode 3 Measure the voltages of P U P V P W as shown in Fig 1 4 Measure the voltages of U Nu V Nv W Nw as shown in Fig 2 5 If the measurements are significantly different from the levels shown in the figures the IPM is deemed to be damaged Fan IPM Check 0 35 V 0 55 V 0 35 V 0 55 V 0 35 V 0 55 V 0 35 V 0 55 V 0 35 V 0 ...

Page 173: ...ly Items for checking 1 Judgment of damage of IGBT 2 Checking the soldering state Fan IPM Check Point Step Flow of Inspection 1 Turn the power off wait until the outdoor device LED is turned off 2 Remove Fan wires 3 Measure the voltage as shown in the ﬁgure 4 Check the voltage for being in the range of 0 35 V 0 55 V 5 Judge Fan IPM Pins for short Nu Nv Nw P U 28 FAN_IPM W V 28 26 24 31 1 2 11 26 2...

Page 174: ...ing 173 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes Noise Filter wiring Check Point Input Power Source Check Point L N Inverter PCB wiring Check Point L N N N L L N L ...

Page 176: ...rom PCB with a tool Replace New PCB Hang wires up on the Rib from Case and Insert PCB into Control Box Assemble C Box and Top Cover into a complete whole Re wire terminal Tighten PCB Screws 4ea A2UW14GFA2 A2UW16GFA2 A3UW18GFA2 A3UW21GFA2 1 4 7 2 5 8 3 6 9 Copyright 2016 2020 LG Electronics Inc All rights reserved Only training and service purposes 175 ...

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