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Part 4 Trouble Shooting

- 56 -

Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.

Lo

Charging
cylinder

Outdoor unit

Indoor unit

Liquid side

Gas side

Open

3-Way
valve

3-Way
valve

OPEN

Open

Check valve

(1)

Vacuum
Gage

• Procedure

(1) Connect the charge hose to the charging

cylinder.

– Connect the charge hose which you dis-con-

nected from the vacuum pump to the valve at
the bottom of the cylinder.

– If you are using a gas cylinder, also use a

scale and reverse the cylinder so that the sys-
tem can be charged with liquid.

(2) Purge the air from the charge hose.

– Open the valve at the bottom of the cylinder

and press the check valve on the charge set to
purge the air. (Be careful of the liquid refriger-
ant). The procedure is the same if using a gas
cylinder.

(3) Open the valve (Lo side on the charge set and

charge the system with liquid refrigerant.

– If the system can not be charged with the spec-

ified amount of refrigerant, it can be charged
with a little at a time (approximately 150 g 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 operating the air conditioner turn off
the air conditioner before disconnecting the hose.

(5) Mount the valve stem nuts and the service port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

WARNING

When installing or relocation the unit, make sure
that no substance other than the specified refriger-
ant(R410A) enter the refrigerant circult.

- Any presence of foreign substance such as air
can cause an abnormal pressure rise and may

This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.

4. Gas Charging (After Evacuation)

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Summary of Contents for UV18F

Page 1: ...UAL General CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel CONFIDENTIAL Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...1 List of Functions Accessory 21 2 Air Flow 32 3 Installation Functions 34 4 Reliability 39 5 Convenience Functions Controls 40 6 Special Function KIT 48 Part 3 Basic Control 49 1 Normal operation 50 2 Compressor control 50 3 EEV Electronic Expansion Valve control 50 Part 4 Trouble Shooting Guide 52 1 Self diagnosis Function 54 2 Pump Down 55 3 Evacuation All amount of refrigerant leaked 56 4 Gas ...

Page 3: ... 3 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes 1 Safety Precautions 4 2 Model Line Up 13 3 Nomenclature 16 Part 1 General Information ...

Page 4: ...ns 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 fr...

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

Page 8: ... have not degraded such that they no longer serve the purpose of preventing the ingress of flammable atmospheres Replacement parts shall be in accordance with the manufacturer s specifications NOTE The use of silicon sealant 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 intrinsical...

Page 9: ... part 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...

Page 10: ...ple 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 person...

Page 11: ...nt Cylinders 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...

Page 12: ...inished 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 ter...

Page 13: ...d Compact UT36F UT42F UT48F UT60F High UT24FH UT30FH UT36FH UT42FH UT48FH UT60FH Round TY Standard UT36F UT48F Ceiling Concealed Duct Low Static Pressure L5 Standard Compact CL09F CL12F High UL12FH L6 Standard Compact CL18F L3 Standard Compact CL24F High UL18FH Mid Static Pressure M1 Standard Compact CM18F CM24F UM30F High UM12FH UM18FH M2 Standard Compact UM36F UM42F High UM24FH UM30FH M3 Standar...

Page 14: ...18 1Φ 220 240 V 50Hz 1 Part Main PCB 3 6 8 24 7 5 30 UUC1 U4 6 8 24 1Φ 220 240 V 50Hz 1 Part Main PCB 4 5 7 5 30 9 5 36 UUD1 U3 9 5 36 1Φ 220 240 V 50Hz O 4 Parts Cycle PCB Inverter PCB Fan PCB Noise Filter 6 12 0 42 13 4 48 14 6 60 UUD3 U3 9 5 36 3Φ 380 415 V 50Hz O 4 Parts Cycle PCB Inverter PCB Fan PCB Noise Filter 7 12 0 42 13 4 48 14 6 60 Category Chassis Name Grade Capacity Index kW kBtu h 2...

Page 15: ...F UV60F Outdoor Unit Model Name Indoor Unit Model IDU Quantity Duo Trio Quartet UUD1 UUD3 CT12F CT18F CT24F UT30F CL12F CM18F CM24F UM30F Capacity kW kBtu h Outdoor Unit Chassis Indoor Unit Ceiling Cassette Ceiling Concealed Duct Ceiling Suspended Console Wall Mounted Low Static Pressure Mid Static Pressure 2 5 9 UUA1 UT09FH 3 4 12 UT12FH UL12FH UM12FH 5 0 18 UUB1 UT18FH UL18FH UM18FH UV18FH 6 8 2...

Page 16: ...oner B Ceiling Concealed Duct Air Conditioner V Ceiling Suspended Air Conditioner J Wall Mounted Air Conditioner Q Console Air Conditioner Connectable Outdoor unit type U Indoor units only for Single A systems C Indoor units for Single A Multi systems common use Chassis name T C N F B 0 24 U3 1 0 U U D Serial number Electrical rating 1 1Ø 200 240V 50Hz 3 3Ø 380 415V 50Hz Model Type U Universal mod...

Page 17: ... 1 General Information Functions A Basic C Air cleaning E Elevation Grille F Floor Detecting Air Cleaning Chassis A TM A TP B Q TR TQ Decoration Panel of Ceiling Cassette Type Indoor Unit A A P T G W 0 Look Serial Color W White B Black G Grid H Horizontal 3 3 Decoration panel For ceiling cassette models ...

Page 18: ...8 Floor standing Wall mounted Ceiling mounted Minimum floor area The appliance shall be installed operated and stored in a room with a floor area larger than the minimum area Use the graph of table to determine the minimum area m Total refrigerant amount in the system Total refrigerant amount factory refrigerant charge additional refrigerant amount Amin minimum area for installation ...

Page 19: ...ted m kg Amin m2 1 224 1 224 1 43 1 4 1 87 1 6 2 44 1 8 3 09 2 3 81 2 2 4 61 2 4 5 49 2 6 6 44 2 8 7 47 3 8 58 3 2 9 76 3 4 11 02 3 6 12 36 3 8 13 77 4 15 25 4 2 16 82 4 4 18 46 Wall mounted m kg Amin m2 4 6 20 17 4 8 21 97 5 23 83 5 2 25 78 5 4 27 80 5 6 29 90 5 8 32 07 6 34 32 6 2 36 65 6 4 39 05 6 6 41 53 6 8 44 08 7 46 72 7 2 49 42 7 4 52 21 7 6 55 07 7 8 58 00 Ceiling Mounted m kg Amin m2 1 2...

Page 20: ... 34 3 1 E S P External Static Pressure Setting 34 3 2 High Ceiling operation 38 4 Reliability 39 4 1 Hot start 39 4 2 Self diagnosis Function 39 4 3 Soft dry operation 39 5 Convenience Functions Controls 40 5 1 Cooling heating Operations 40 5 2 Auto cleaning operation 41 5 3 Auto changeover operation 41 5 4 Auto restart Opeartion 41 5 5 Child Lock Function 42 5 6 Forced operation 42 5 7 Group Cont...

Page 21: ...on artificial intelligence O Multi Only O Multi Only X Auto Restart O O O Child lock O O O Forced operation O O O Group control O O O Sleep mode O O O Timer on off O O O Timer weekly O O O Two thermistor control O O O Special Functions Wi Fi O Accessory O Accessory O Accessory Comfort Coolng Humidity Control O X O Wireless Remote Controller O Accessory O Accessory O Accessory Wired Remote Controll...

Page 22: ...ay IDU PI485 PHNFP14A0 Without case X X X PSNFP14A0 With case X X X ETC Remote temperature sensor PQRSTA0 X O O Zone controller ABZCA X X X CO2 Sensor PES C0RV0 For ERV ERV DX Indoor units X X X Group control wire PZCWRCG3 0 25m O O O 2 Remo Control Wire PZCWRC2 0 25m O O X Extension Wire PZCWRC1 10m O O O Wi Fi Controller PWFMDD200 O O O Human detecting sensor PTVSMA0 O X X Drain pump ABDPG X X X...

Page 23: ...ulti Only O Multi Only O Multi Only Auto Restart O O O Child lock O O O Forced operation X X X Group control O O O Sleep mode O O O Timer on off O O O Timer weekly O O O Two thermistor control O O O Special Functions Wi Fi O Accessory O Accessory O Accessory Comfort Coolng Humidity Control X X X Wireless Remote Controller O Accessory O Accessory O Accessory Wired Remote Controller O Accessory O Ac...

Page 24: ... PHNFP14A0 Without case X X X PSNFP14A0 With case X X X ETC Remote temperature sensor PQRSTA0 O O O Zone controller ABZCA O O O CO2 Sensor PES C0RV0 For ERV ERV DX Indoor units X X X Group control wire PZCWRCG3 0 25m O O O 2 Remo Control Wire PZCWRC2 0 25m O O O Extension Wire PZCWRC1 10m O O O Wi Fi Controller PWFMDD200 O O O Human detecting sensor PTVSMA0 X X X Drain pump ABDPG O Embedded Embedd...

Page 25: ...Restart O O Child lock O O Forced operation O O Group control O O Sleep mode O O Timer on off O O Timer weekly O O Two thermistor control O O Special Functions Wi Fi O Accessory O Accessory Comfort Coolng Humidity Control O O Wireless Remote Controller O O Wired Remote Controller O Accessory O Accessory Network Solution LGAP O O Note 1 O Applied X Not applied Accessory Ordered and purchased separa...

Page 26: ...out case X X PSNFP14A0 With case X X ETC Remote temperature sensor PQRSTA0 O O Zone controller ABZCA X X CO2 Sensor PES C0RV0 For ERV ERV DX Indoor units X X Group control wire PZCWRCG3 0 25m O O 2 Remo Control Wire PZCWRC2 0 25m O O Extension Wire PZCWRC1 10m O O Wi Fi Controller PWFMDD200 O O Human detecting sensor PTVSMA0 X X Drain pump ABDPG X X Note 1 O Possible X Impossible Not applicable Em...

Page 27: ...Auto Restart O Child lock O Forced operation O Group control O Sleep mode O Timer on off O Timer weekly O Two thermistor control O Special Functions Wi Fi O Accessory Comfort Coolng Humidity Control O Wireless Remote Controller O Wired Remote Controller O Accessory Network Solution LGAP O Note 1 O Applied X Not applied Accessory Ordered and purchased separately the accessory package referring to t...

Page 28: ...A0 With case X ETC Remote temperature sensor PQRSTA0 Zone controller ABZCA X CO2 Sensor PES C0RV0 For ERV ERV DX Indoor units X Group control wire PZCWRCG3 0 25m 2 Remo Control Wire PZCWRC2 0 25m Extension Wire PZCWRC1 10m Wi Fi Controller PWFMDD200 Human detecting sensor PTVSMA0 X Drain pump ABDPG X Note 1 O Possible X Impossible Not applicable Embedded Included with product 2 Some advanced funct...

Page 29: ...o Restart O Child lock O Forced operation O Group control X Sleep mode O 7Hr Timer on off O Timer weekly O Two thermistor control O Special Functions Wi Fi O Comfort Coolng Humidity Control X Wireless Remote Controller O Wired Remote Controller O Accessory Network Solution LGAP O Note 1 O Applied X Not applied Accessory Ordered and purchased separately the accessory package referring to the model ...

Page 30: ...th case X ETC Remote temperature sensor PQRSTA0 X Zone controller ABZCA X CO2 Sensor PES C0RV0 For ERV ERV DX Indoor units X Group control wire PZCWRCG3 0 25m X 2 Remo Control Wire PZCWRC2 0 25m X Extension Wire PZCWRC1 10m Wi Fi Controller PWFMDD200 Embedded Human detecting sensor PTVSMA0 X Drain pump ABDPG X Note 1 O Possible X Impossible Not applicable Embedded Included with product 2 Some adva...

Page 31: ...ssory Compatibility List Category Functions UUA1 UUB1 UUC1 UUD1 UUD3 Reliability Defrost Deicing O O O High pressure switch O O O Low pressure switch X X X Phase protection X X O Restart delay 3 minutes O O O Self diagnosis O O O Soft start O O O Convenience Test function O O O Night Silent Operation X O O Wiring Error Check X X X Peak Control X O O Mode Lock X O O Forced Cooling Operation Outdoor...

Page 32: ...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 33: ...ing 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 those of the initial cooling mode and then operated in order that the air outflow could reach further 2 7 Swir...

Page 34: ... be set up 3 When pressing the button and button simultaneously for more than 3 seconds after the setting has been completed the setting mode will be released If there isn t any button input for more than 25 seconds the installer setting mode will also be released 4 00 use static pressure code 06 set value 01 11 static pressure step code 32 set value Function Code Existing condition This function ...

Page 35: ...a 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 L5 9 Standard Compact LOW 8 76 87 96 106 116 116 MID 9 5 87 96 106 114 120 120 HIGH 11 5 101 109 118 125 130 130 L5 12 Standard Compact LOW 8 76 87 96 106 116 116 MID 9 5 87 96 106 114 120 120 HIGH 11 5 101 109 118 125 130 130 L6 18 Standard Compact LOW 10 82 87 90 96 106 116 MID 12 5 92 98 105 109 119 128 HIGH 15 100...

Page 36: ... 114 121 124 127 130 MID 16 5 86 87 90 94 103 111 118 125 128 131 134 HIGH 18 90 92 95 99 108 115 122 129 132 135 138 M1 12 High LOW 9 64 67 70 72 81 94 103 110 113 117 121 MID 12 68 72 74 76 86 100 108 115 118 121 125 HIGH 16 81 86 89 93 98 110 118 124 127 131 135 M1 18 High LOW 14 76 77 86 89 97 107 114 121 124 127 130 MID 16 86 87 90 94 103 111 118 125 128 131 134 HIGH 17 5 90 92 95 99 108 115 ...

Page 37: ...02 107 MID 34 78 82 84 89 94 96 98 101 104 106 112 HIGH 40 83 89 92 94 98 100 102 105 108 110 116 M3 48 High LOW 28 74 76 79 82 89 92 94 96 99 102 107 MID 34 78 82 84 89 94 96 98 101 104 106 112 HIGH 40 83 89 92 94 98 100 102 105 108 110 116 M3 36 High LOW 28 74 76 79 82 89 92 94 96 99 102 107 MID 34 78 82 84 89 94 96 98 101 104 106 112 HIGH 40 83 89 92 94 98 100 102 105 108 110 116 M3 42 High LOW...

Page 38: ...r 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 exist depending on the indoo...

Page 39: ...3 Soft dry operation 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 minutes dehumidification ope...

Page 40: ...fference 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 sec onds 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 setting temperature Conditio...

Page 41: ...ungus and bad odor Used after the Cooling Operation before turning the unit off clean the Evaporator and keep it dry for the next opera tion The function is easy to operate as it is accessed through the Remote controller Unit Operation ON OFF Comp Indoor Fan ON OFF ON OFF Setting step OFF L Low Setting step Cooling Only 5 3 Auto changeover operation The air conditioner changes the operation mode a...

Page 42: ...ed 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 using button setup icon bli...

Page 43: ...function 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 minute 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 m...

Page 44: ...e is input while in heating cycle mode the airflow speed of the indoor fan is set to the medi um 5 9 Timer On Off 5 9 1 On Timer Operation When the set time is reached after the time is input by the remote control 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 ti...

Page 45: ...on ڹڸ by using button You can setup two reservations weekly reservation 1 and weekly reservation 2 for a day 3 Please move to date setup part by using button If date indication blinks please setup date You can setup date from Monday to Sunday 4 Please move to AM PM setup part of turning on by using button 5 Please move to hour setup part of turning on by using button It is the part to setup the ti...

Page 46: ...button Weekly reservation setup for the day that you set is finished 12 If you setup with the method identical with above by selecting the day that you d like to setup it operates weekly reservation If you setup both turning on reservation time and turning off reservation time identically it doesn t operate reservation drive 13 Weekly reservation explanation Under bar the indication that there is ...

Page 47: ...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 48: ... problem Easily controlled by wired remote control Air Flow can be controlled easily regarding any space environment 6 1 Low Ambient control This Function is for cooling operating in outdoor low temperature If outdoor temperature drops below certain temperature liquid back is prevented by reducing outdoor fan speed It can prevent frosting of evaporator and keep cooling operation 6 Special Function...

Page 49: ... Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Part 3 Basic Control 1 Normal operation 50 2 Compressor control 50 3 EEV Electronic Expansion Valve control 50 ...

Page 50: ...uzzy control to ensure the stable system performance 2 Compressor control Cooling and heating load System capacity Linear control Inverter linear control as cooling and heating load increasing Actuator Cooling operation Heating operation Stop state Compressor Fuzzy control Fuzzy control Stop Fan Fuzzy control Fuzzy control Stop EEV Discharge Temp Control Discharge Temp Control Min Pulse EEV operat...

Page 51: ...tdoor 53 2 Pump Down 54 3 Evacuation 55 4 Gas Charging 56 5 Cycle Part 57 6 Electronic Parts 58 6 1 The Product doesn t operate at all 58 6 2 The Product doesn t operate with the remote controller 59 6 3 The Compressor Outdoor Fan are don t operate 60 6 4 When indoor Fan does not operate 61 6 5 When the louver does not operate 62 6 6 Troubleshooting Indoor Error 63 6 7 Troubleshooting Outdoor Erro...

Page 52: ...r of indoor unit is open or short 2 Inlet pipe temperature Sensor of indoor unit Inlet pipe temperature sensor of indoor unit is open or short 3 Communication error wired remote controller indoor unit Failing to receive wired remote controller signal in indoor unit PCB 4 Drain pump Malfunction of drain pump 5 Communication error outdoor unit indoor unit Failing to receive outdoor unit signal in in...

Page 53: ...61 Outdoor Device Pipe Overheating Error Stop Infinite restart 62 Heat sink Overheating Error Stop Infinite restart 65 Heat sink Sensor Error Stop 1 time Within 1h 67 Outdoor BLDC Fan Lock Error Stop 10 time Within 1h 73 PSC PFC Over Current Error SW Stop Infinite restart Code Contents Operation State Count 21 IPM Fault Error Stop 10 time Within 1h 22 CT 2 Error Input of Over Current Stop Infinite...

Page 54: ... power source down 2 Reset the power 3 Red LED and Green LED of PCB lights during work The indoor unit is operated by force 4 If operation is done Red LED will be turned off If operation is not done normally Red LED will blink 5 Close the Liquid valve only after green LED turned off 7 minutes from the start of the machine Then close the gas valve after Green LED on UUB1 UUC1 UUD1 UUD3 1 2 3 4 5 6 ...

Page 55: ...le does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge 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 Ot...

Page 56: ...ed with a little at a time approximately 150 g 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 re...

Page 57: ...een 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 7 0 8 5 kg cm2 G Cooling at normal condition R32 2 The temperature can be ...

Page 58: ...Check 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 AC 220 V AC 240 V 50 Hz and check for the following The voltage of main power supply The voltage applied to the unit The connecting method of Ind...

Page 59: ...ade from the indoor unit Check the voltage of power AC 220 V AC 240 V 50 Hz 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 5 V If problem still ...

Page 60: ...onnection 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 AC 220 V 240 V Check...

Page 61: ...eck the connection of CN FAN Check the Fan Motor Check the Fuse AC 250 V T2 A 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...

Page 62: ...Check the soldering condition on PCB of CN U D or CN_L R Connector Check the operating circuit of the vertical louver Confirm that there is DC 12 V between pin of CN U D CN_L 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 ope...

Page 63: ...nsor 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 E...

Page 64: ... the 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 c...

Page 65: ... 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 DC 15V output Replace indoor unit PCB Replace Drain Pump Yes Check the drain...

Page 66: ...nc 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 67: ...or 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 68: ... 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 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 addressi...

Page 69: ...dust filter Check condition of the ultra fine dust filter film Is the front grille fully secured Action fully secure the front grill Check whether the front grill is opened or closed Check contacts of the limit switch Action connect the limit switch housing and the HVPS connector Limit switch housing Connect the HVPS to CN AIRC Check the connection of the limit switch housing and the HVPS connecto...

Page 70: ... fault 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 detec...

Page 71: ...on 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 phas...

Page 72: ...ateral 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 Tr...

Page 73: ...nt 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 S...

Page 74: ...Turn the switch of the tester to Resistance mode and check the resistance 2 Measure the resistance between the terminals 3 0 Ω means the short 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 ...

Page 75: ...e compressor terminals Compressor terminals Model DKT156MAD DKT208MAB RJB036MAB DJT240MAA Windings Resistance at 25 U V 1 330 7 Ω 1 125 7 Ω 0 529 7 Ω 0 628 7 Ω V W 1 330 7 Ω 1 125 7 Ω 0 529 7 Ω 0 628 7 Ω W U 1 330 7 Ω 1 125 7 Ω 0 529 7 Ω 0 628 7 Ω Windings Resistance at 75 U V 1 620 7 Ω 1 345 7 Ω 0 631 7 Ω 0 758 7 Ω V W 1 620 7 Ω 1 345 7 Ω 0 631 7 Ω 0 758 7 Ω W U 1 620 7 Ω 1 345 7 Ω 0 631 7 Ω 0 75...

Page 76: ...ce 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 ...

Page 77: ...Diode 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 ...

Page 78: ...ssembly 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 2 7 8 9 0W 0X 0Y...

Page 79: ...G Electronics Inc All rights reserved Only training and service purposes IPM Check Point 4 kW 3 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 80: ...ll 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 81: ...e 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 82: ...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 Replace PCBA Current detection part is norm...

Page 83: ...Shooting 83 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Compressor Phase Current Detection Division 2 kW 3 kW Current Detection Circuit Check Point ȟ GND Comp Current ...

Page 84: ...ght 2019 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 85: ...oting 85 Copyright 2019 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 86: ...tart 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...

Page 87: ...Part 4 Trouble Shooting 87 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes 4Way Check Division 2 kW 4 kW 4 5kW 4 Way Check Point CN_4WAY_YL ...

Page 88: ...Part 4 Trouble Shooting 88 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes 4Way Check Division 4 kW 6 7 kW 4 Way Check Point ...

Page 89: ...Part 4 Trouble Shooting 89 Copyright 2019 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 90: ...ent 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 45...

Page 91: ...he 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 Rep...

Page 92: ...s reserved Only training and service purposes DC Link Detection Circuit Check Point Division 2 kW 4 kW 4 5kW DC Link Detection Circuit Check Point Red Black GND GND DC_LINK DC_LINK GND DC_ Link 1 Check DC Link Sensing Signal measurements at Power on standby state DC 2 4 2 8 V ...

Page 93: ...ting 93 Copyright 2019 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 94: ...ng 94 Copyright 2019 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 95: ...d 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 f...

Page 96: ...g 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...

Page 97: ...standard 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 Repl...

Page 98: ...oting 98 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Vdc 2 5 V Input Current Detection Point Division 2 kW 4 kW 4 5 kW I_IN I_IN GND GND Red Black 62 PRWV WTTGPV GND GND ...

Page 99: ...Part 4 Trouble Shooting 99 Copyright 2019 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 100: ...0 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes LGMV Display DC Link NG Voltage level Driver Current Level 2kW 11A 3 4kW 16A 4 5kW 20A 6kW 29A 7kW Cooling Mode 12A Heating Mode 14A ...

Page 101: ...st 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 ...

Page 102: ... power 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 103: ... 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Reactor Connector Point Division 2 kW 3 kW 4 5 kW 6 kW 7 kW Checking Reactor Connection OUT IN 6 7 Troubleshooting Outdoor Error CH 23 DC Link Voltage Low ...

Page 104: ...int Division 4kW 2kW 3kW 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 4 6 8 4 6 6 8 ...

Page 105: ...rement 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...

Page 106: ...Part 4 Trouble Shooting 106 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Division PFCM Point 6 kW 4 5 kW 2 kW 3 kW B Diode of Discrete PFC Point ...

Page 107: ...nd 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 108: ...fective 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 Excessi...

Page 109: ...ssure 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...

Page 110: ...right 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Check Point 2 kW 3 kW 3 kW 0A24 55A9 0A24 55A59 6 7 kW Main 6 kW Inv 7 kW Inv Note2 Check Point High pressure switch Normal Short Abnormal Open ...

Page 111: ...es 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 fa...

Page 112: ...shorts 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 cir...

Page 113: ...Transfer 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 con...

Page 114: ...frigerant 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 C...

Page 115: ...ode 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 Emit...

Page 116: ...d Transfer of signals with detection of the ﬂow of over current in PSC PFC blocking of a outdoor unit 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 Compressor current detection circuit fault DC link detection circuit fault and fault of single uni...

Page 117: ...er shorts Checking compressor wiring Checking power connection state 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 Manifold gauge Flow of trouble diagnosis Checking IPM connection state Checking single unit of IPM Checking Compressor current detection c...

Page 118: ...xceeding 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 ...

Page 119: ...voltage 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 Troublesho...

Page 120: ...e 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 Lo...

Page 121: ...oor 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 ...

Page 122: ... Power 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 ...

Page 123: ...If 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 tem...

Page 124: ...ong 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 ...

Page 125: ...esistance 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 Troubles...

Page 126: ... sensor temperature Position Outlet of 4 way valve based on cooling mode 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 6...

Page 127: ... 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 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 b...

Page 128: ...unication 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 129: ...r 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 5...

Page 130: ...7 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 131: ...e 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 outdo...

Page 132: ...ion 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...

Page 133: ...nication 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 134: ...LG 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 135: ...mmunication 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...

Page 136: ... constant 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 Rever...

Page 137: ...rn 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...

Page 138: ...t 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 ...

Page 139: ...r 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 ...

Page 140: ...uble Shooting 140 Copyright 2019 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 141: ...ironment 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 Troubles...

Page 142: ...M 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 s...

Page 143: ...ics 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 144: ...ecking 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 resist...

Page 145: ...Part 4 Trouble Shooting 145 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes Heat sink Tempe Sensor Point Division 6 kW ...

Page 146: ... 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 inserted in reverse direct...

Page 147: ...of 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 148: ... 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 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...

Page 149: ...ction 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 24 31 1 2 11 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes 149 Part 4 Tro...

Page 150: ...P NO MFL71683601 Copyright 2019 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

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