Internal Use Only http://biz.lgservice.com Multi Air Conditioner SVC MANUAL(General) MODEL : Multi-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.
Air Conditioner Service Manual TABLE OF CONTENTS Part 1 General Information ..........................................................................................................2 1. Safety Precautions........................................................................................................3 2. Model Line Up................................................................................................................6 3. Nomenclature ......................................................
Part 1 General Information 1. Safety Precautions ............................................................................................................3 2. Model Line Up .....................................................................................................................6 3. Nomenclature......................................................................................................................9 Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 1 General Information 1. Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. ■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only. ■ Meanings of symbols used in this manual are as shown below.
Part 1 General Information Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock. Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc. Indoor/outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals.
Part 1 General Information 1.2 Inspections after Repair Check to see if the power cable plug is not dirty or loose. If the plug is dust or loose it can cause an electrical shock or fire. Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. otherwise, it can cause an electrical shock, excessive heat generation or fire. Do not insert hands or other objects through the air inlet or outlet while the product is operating.
Part 1 General Information 2. Model Line Up 2.1 Indoor units Category Chassis 2.1(7) Wall mounted SB 2.6 (9) Model names Capacity, kW(kBtu/h Class) 3.5 (12) 4.2(15) 5.3 (18) 10.6 (36) AMNW07GDBL1 AMNW09GDBL1 AMNW12GDBL1 AMNW15GDBL1 [LMN077HVT] [LMN097HVT] [LMN127HVT] [LMN157HVT] AMNW18GDCL1 AMNW24GDCL1 [LMN187HVT] [LMN247HVT] SC ART COOL Mirror 7.
Part 1 General Information 2.2 Outdoor units Multiple Piping Type Model Name No. of connectable indoor units (Min. ~ Max.) Total capacity index of connectable indoor units A2UW18GFA0 [LMU18CHV] 2~2 A3UW24GFA0 [LMU24CHV] 2~3 A4UW36GFA0 [LMU36CHV] 2~4 24 33 48 Power supply 208/230V, 1Ø, 60Hz Chassis Branch Distribution type Model Name A8UW54GFA0[LMU540HV] No. of connectable indoor units (Min. ~ Max.
Part 1 General Information 2.3 BD(Branch distributor) units No. of connectable indoor units(Min. ~ Max.) Model name Connectable indoor unit capacity kBtu/h 1~2 PMBD3620 9 ~ 24 1~3 PMBD3630 9 ~ 24 1~4 PMBD3640 9 ~ 24 PMBD3641 9 ~ 36 BD unit 2.4 Branches Specifications Branch No. of BD Accessory Applicable Type Units Model Name Model YBranch Gas To ODU Ø19.05 (3/4) 2 Liquid To BD unit Ø19.05 (3/4) To ODU Ø9.52 (3/8) To BD unit Ø9.52 (3/8) PMBL5620 MULTI F MAX Ø19.
Part 1 General Information 3. Nomenclature 3.
Part 1 General Information 3.3 BD units(Global) P M BD 36 2 0 Serial number Number of connectable indoor units Max. capacity of connectable indoor units “36” mean that 5k~24k Indoor unit connected to BD unit BD : Branch distributor M : Multi system outdoor unit P : Parts Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 2 Functions & Controls Part 2 Functions & Controls 1. List of Functions & Accessory......................................................................................12 2. Air flow ............................................................................................................................14 2.1 Auto swing (left & right) ...............................................................................................14 2.2 Auto swing (up & down) ........................................
Part 2 Functions & Controls 1. List of Functions & Accessory 1.1 List of Functions • Indoor Category Functions Air supply outlet Airflow direction control (left & right) Airflow direction control (up & down) Auto swing (left & right) Air flow Auto swing (up & down) Airflow steps (fan/cool/heat) Chaos wind(auto wind) Jet cool/heat Swirl wind Triple filter (Deodorizing) Ventilation Kit Air purifyPlasma air purifier ing Allergy Safe filter Long-life prefilter (washable / anti-fung Drain pump E.S.P.
Part 2 Functions & Controls • Outdoor Category Functions Remark Defrost / Deicing O High pressure switch X Low pressure switch X Phase protection X Restart delay (3-minutes) O Self diagnosis O Soft start O Test function X Night Silent Operation O Network solution(LGAP) O Reliability Convenience Network function [Note] ○ : Applied, × : Not applied * Option : Model name & price are different according to options, and assembled in factory with main unit.
Part 2 Functions & Controls 2. Air flow 2.1 Auto swing (left & right) • By the horizontal airflow direction control key input, the left/right louver automatically operates with the auto swing or it is fixed to the desired direction. Left Right 110° ~ 120° 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. Close 110° ~ 120° Open 2.
Part 2 Functions & Controls 2.4 Air flow step • Indoor fan motor control have 6 steps. • Air volume is controlled "SH", "H", "Med", Low" by remote controller. • "LL" step is selected automatically in Hot start operation. Step Discription LL Very low, In heating mode L M H Low Med High SH Auto Super high Chaos wind 2.5 Chaos wind (auto wind) • When "Auto" step selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec.
Part 2 Functions & Controls 3. Air purifying 3.1 PLASMA Air Purifying System The PLASMA Air Purifying System not only removes microscopic contaminants and dust, but also removes house mites, pollen, and pet fur to help prevent allergic diseases like asthma. This filter that can be used over and over again by simply washing with water. Dust electrode discharge Dust particles Photo-Catalyst Coated Mesh Ionizer +4.
Part 2 Functions & Controls 4. Installation Functions 4.1 E.S.P. (External Static Pressure) Setting This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier. • If you set ESP incorrectly, the air conditioner may malfunction. • This setting must be carried out by a certificated-technician.
Part 2 Functions & Controls 5. Reliability 5.1 Hot start • When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out • When the temp. of heat exchanger reach 30°C(model by model), indoor fan is started. 5.2 Self-diagnosis Function • The air conditioner installed can self-diagnosed its error status and then transmits the result to the central control.
Part 2 Functions & Controls 6. Convenience Functions & Controls 6.1 Cooling & heating Operations 6.1.1 Cooling Mode • Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions. • If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 seconds. ( not emergency conditions) • Compressor turned off when - intake air temperature is in between ±0.
Part 2 Functions & Controls 6.2 Auto cleaning operation • Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor. • Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next operation. • The function is easy to operate as it is accessed through the Remote controller. Unit Operation (Cooling Only) ON OFF ON Indoor Fan OFF Setting step L Low OFF ON Comp. OFF Setting step 6.
Part 2 Functions & Controls 6.3.2 Fuzzy Operation for Dehumidification • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the 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.
Part 2 Functions & Controls 6.5 Child Lock Function It is the function to use preventing children or others from careless using. 1 FAN During the operation, when pressing the button and SPEED button for approx. 3 seconds, the ‘Child Lock’ Function can be used. - At the time of initial setting of the ‘Child Lock’, the ‘CL’ Will be indicated approx. 3 seconds at the temperature Display section before resuming to the previous mode.
Part 2 Functions & Controls 6.7 Group Control 1. When installing more than 2 units of air conditioner to one wired remote controller, please connect as the right figure. • If it is not event communication indoor unit, set the unit as slave. • Check for event communication through the product manual. GND Signal wire 12V GND Signal wire When controlling multiple indoor units with event communication function with one remote controller, you must change the master/slave setting from the indoor unit.
Part 2 Functions & Controls 6.8 Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops. • While the appliance is on pause, the sleep timer mode cannot be input. • While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature increases by 1°C. After another 30 min elapse, it increases by 1°C again.
Part 2 Functions & Controls 6.11 Two Thermistor Control This is the function to select the temperature sensor to judge the room temperature. OPER 1 When pressing the button and MODE button simultaneously for more than 3 seconds, the system will be entered into the installer setting mode. OPER - After entering into the installer setting mode, select the MODE thermistor sensor setting code value by pressing the button.
Part 2 Functions & Controls 7. Special Function & KIT 7.1 Low Ambient control • This Function is for cooling operating in outdoor low temperature . • If outdoor temperature drops below certain temperature, liquid back is prevented by reducing outdoor fan speed. • It can prevent frosting of evaporator and keep cooling operation Outdoor pipe T2°C T1°C Outdoor Fan Speed Setting Speed Off Setting Speed Off Setting Speed 7.
Part 2 Functions & Controls ■ ELEVATION GRILL (REMOTE CONTROLLER_Accessory) • Main Components of Lift Grill Signal transmitter" " ➀ Lift grill front panel assembly ➁ Bolts for installation (4 EA, P/No. 3A00255K) ➂ Instruction manual Ascend ➃ Remote Controller for lift grill Descend • How to Use Remote Controller Stop As for operation of Remote Controller, use it by directing the transmitter part of Remote Controller to the receiver part of front panel directly under front panel.
Part 2 Functions & Controls • How to Operate the Lift Grill • Always stop the air conditioner operation for safety before operating lift grill. • Take heed _ there is worry about dust fall etc. when suction grill descends. • In case when the set automatic stop distance goes wrong, check the set value of operation panel and confirm if there is neither obstacle nor mankind. • When you are not to remove obstacle, stop the operation before touching the obstacle. Automatic Stop Distance of Grill 1.
Part 3 Basic Control Part 3. Basic Control 1. Normal operation..............................................................................................................30 2 Compressor control .........................................................................................................30 3. EEV( Electronic Expansion Valve) control ....................................................................30 4. Oil return control ......................................................................
Part 3 Basic Control 1. Normal operation Basic principle is to control the rpm of the motor by changing the working frequency of the compressor. Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM (intelligent power module). Switching speed of IPM defines the variable frequency input to the motor.
Part 3 Basic Control 4. Oil return control Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe. Each cycle component operates as shown on the below table during oil return operation. Outdoor unit Component Starting Running Ending Compressor 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.
Part 3 Basic Control 6. Protection control 6.1 High pressure protection control Pressure range Pd ≥ 4069 kPa 3938 kPa ≤ Pd < 4069 kPa 3840 kPa ≤ Pd < 3938 kPa 3709 kPa ≤ Pd < 3840 kPa 3611 kPa ≤ Pd < 3709 kPa Pd < 3611 kPa Compressor Off 3Hz down 3Hz down Frequency holding 3 Hz up Normal control ※ 14,16k models are not applied. 6.
Part 4. Test Run Part 4. Test Run 1. Check before Test Run.....................................................................................................34 2. Test Run Flow chart .........................................................................................................35 3. Test Running .....................................................................................................................36 Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 4. Test Run 1. Check before Test Run 1 Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. Check liquid pipe and gas pipe valves are fully opened. 2 NOTE: Be sure to tighten caps. Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground. Do not operate in the case of 2.0 MΩ or less. 3 NOTE: Never carry out mega ohm check over terminal control board.
Part 4. Test Run 2. Test Run Flow chart START Test operation for indoor unit Operate the unit in cooling mode. Does Test operation start? No Refer to part4, 6 Electric part Yes Is cold air discharged for more than 3 minutes ? No Yes Is there any temperature difference between intake and discharged air? Refer to part4, 5 Cycle part No Yes Is the operating current normal ? No Yes Operation mode change to Heating mode Is hot air discharged ? After Hot Start * Check the load (In/Out Temp.
Part 4. Test Run 3. Test Running 3.1 SPLIT, ART cool, ART cool deluxe Type • Check that all tubing and wiring have been properly connected. • Check that the gas and liquid side service valves are fully open. 3.1.1 Prepare remote controller ❶ Remove the battery cover by pulling it according to the arrow direction. ❷ Insert new batteries making sure that the (+) and (–) of battery are installed correctly. ❸ Reattach the cover by pushing it back into position. Bolt Tubing connection 3.1.
Part 4. Test Run 3.2 Ceiling Cassette Type 3.2.1 PRECAUTIONS IN TEST RUN • The initial power supply must provide at least 90% of the rated voltage. Otherwise, the air conditioner should not be operated. CAUTION: ① For test run, carry out the cooling operation first even during winter season. If heating operation is carried out first, it leads to the trouble of compressor. ② Carry out the test run more than 5 minutes without stopping.
Part 5. Trouble Shooting Part 5. Trouble Shooting 1. Self-diagnosis Function.................................................................................................39 1.1 Error Indicator (Indoor)................................................................................................39 1.2 Error Indicator (Outdoor) .............................................................................................40 2. Pump Down......................................................................
Part 5. Trouble Shooting 1. Self-diagnosis Function 1.
Part 5. Trouble Shooting 1.3 Error Indicator (Outdoor) Outdoor Error Ex) Error 21 (DC Peack) 2 Times 2 Times 2 Times LED01G (RED) 1 Sec. 1 Sec. 1 Time 1 Sec. 1 Time 1 Time LED02G (GREEN) 2 Sec. Error Code 21 22 2 Sec. Contents 25 26 27 29 32 35 DC Link Peak (IPM Fault) CT 2 (Max CT) DC Link Low Volt. DC Link High Volt.
Part 5. Trouble Shooting 2. Pump Down This function gathers the refrigerant present in the system to ODU Use this function to store refrigerant of system in ODU for leakage or IDU replacement. • Procedure ■ This function start Dip switch setting status of ODU PCB. (1) Set the Dip switch as follow after shutting the power source down. (2) Reset the power. (3) Check that the Red LED of PCB is on during work.(The indoor unit is operated by force.) (4) Pump down during forced cooling operation. CAUTION 1.
Part 5. Trouble Shooting 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump Vacuum Gage Lo OPEN OPEN • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward 0.8Torr. (4) Disconnect the charge hose from the vacuum pump. – Vacuum pump oil.
Part 5. Trouble Shooting 4. Gas Charging (After Evacuation) Liquid side Indoor unit 3-Way valve Open Outdoor unit Gas side Open 3-Way valve Check valve Charging cylinder Lo (1) OPEN Vacuum Gage • Procedure (1) Connect the charge hose to the charging cylinder. – Connect the charge hose which you dis-connected 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 system can be charged with liquid.
Part 5. Trouble Shooting 5. Cycle Part Trouble analysis 1. Check temperature difference between intake and discharge air, and check for the operating current too. Case Symptom Supposed Caused Case 1 Temp. difference : approx. 0°C Current : less than 80% of rated current All amount of refrigerant leaked out. Check refrigeration cycle. Case 2 Temp. difference : approx. 8°C Current : less than 80% of rated current Refrigerant leakage Clog of refrigeration cycle Defective Compressor. Case 3 Temp.
Part 5. Trouble Shooting 6. Electronic Parts 6.1 The Product doesn’t operate at all Turn off the main power and wait for 10 seconds. Turn on the main power again. A "Beeping" sound is made from the indoor unit Yes Primarily, the operating condition of Micom is O.K. * Check, Remote controller & Receiver. * Check CN-DISP1, CN-DISP2 of indoor PCB No 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.
Part 5. Trouble Shooting 6.2 The Product doesn't operate with the remote controller Turn on the main power A "Beeping" sound is made from the indoor unit No * Refer to 10.1 Yes Is it possible to turn on the unit by ON/OFF button on display? No * Check the voltage of power (AC220V/AC240V, 50Hz). Yes Is the remote controller working properly? No * When the mark ( ) is displayed in LCD screen, replace battery. Yes * Check the contact point of CN-DISP 1, 2 connector & Re connector.
Part 5. Trouble Shooting 6.3 The Compressor/Outdoor Fan are don't operate Turn on the main power. Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped. Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.
Part 5. Trouble Shooting 6.4 When indoor Fan does not operate. Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. 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.
Part 5. Trouble Shooting 6.5 When the louver does not operate. • Confirm that the vertical louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the vertical louver with hands ⇒ Normal • Check the connecting condition of CN-U/D or CN0L/R Connector • Check 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 ➀ of CN-U/D, CN0L/R and GND.
Part 5. Trouble Shooting 6.6 Troubleshooting Indoor Error Display code Title 01 Indoor air sensor • Open / Short • Soldered poorly • Internal circuit error Normal resistor : 10KΩ/ at 25°C (Unplugged) Normal voltage : DC 2.5V / at 25°C (plugged) 02 Indoor inlet pipe sensor • Open / Short • Soldered poorly • Internal circuit error Normal resistor : 5KΩ/ at 25°C (Unplugged) Normal voltage : DC 2.
Part 5. Trouble Shooting Display code Title 03 Communication Wired R/C Cause of error Wired R/C 12V S • Open / Short • Wrong connection Indoor Unit GND 12V S • Connection of wire • Main PCB Volt. DC12V • Noise interference CN-REMO GND 12Vdc 12Vdc V V Check the Volt. Check point & Normal condition Check the Volt. Check Point 1. Check the wire connection. (Open / Short) → Repair the connection 2. Check the soldering state of connector. (Soldered poorly) → Repair or Change the PCB. 3.
Part 5. Trouble Shooting Display code Title 04 Drain pump / Float switch Cause of error • Float switch Open. (Normal : short) Check point & Normal condition • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (230V) • Drain tube installation. • Indoor unit installation. (Inclination) CN Float CN-D/PUMP CN-Float 0Ω" Ω" Check the resistance Check Point 1. Check the wire connection. (Open, Soldered poorly) → Repair the connection or change the PCB. 2.
Part 5. Trouble Shooting Display code Title 07 Different Operation Mode Cause of error Check point & Normal condition • One of Indoor Unit operate cooling Another Unit • At the same time, this model cannot use cool and heating mode operate heating Check Point 1. Check another indoor model operation mode 2. Operating the same mode with the first operated indoor unit 3.
Part 5. Trouble Shooting Display code Title 09 Indoor EEPROM Check Sum Error Cause of error • Check sum error Check point & Normal condition 1. Check the poor soldering 2. Check the insertion condition of the EEPROM 3. Check the PCB Connection Check Point 1. Check the EEPROM Direction 2. If the EEPROM value & the Program value are not matched, the Code is Displayed 3.
Part 5. Trouble Shooting Display code Title Cause of error 10 Indoor BLDC Fan Motor Lock The Fan is not operated properly Yellow Check point & Normal condition Check the Indoor fan locking White Blue Black Red Fan motor connector Tester Check Point Check the PCB during the Power on 1. Check the Voltage Red line to Black line → The Voltage is about [input voltage x 1.414] → if the Voltage does not come with the above Voltage, → Check the power input → Replace the PCB & Motor 2.
Part 5. Trouble Shooting 6.
Part 5. Trouble Shooting Table 1 Model 18/24k Resistance(Ω) Terminal Inverter Comp. U-V 1.125(at25℃) V-W 1.125(at25℃) W-U 1.125(at25℃) Table 1 Resistance of terminal insulations) 1MΩ ↑ U - chassis 1MΩ ↑ V - chassis 1MΩ ↑ W - chassis [IPM Position & Pin number] Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code 22 Title Cause of error Check point & Normal condition • Input voltage error(low voltage) • Check input voltage AC Input current is higher • Over load operation • Check outdoor fan canstraint / screened / flow than the limit. (Outdoor fan constraint, structure screened, blocked) • Check PCB current sensor parts • Burned parts inside PCB WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
Part 5. Trouble Shooting Display code 23 Title DC Link High / Low Volt Cause of error Check point & Normal condition • DC Link Voltage is above • Check Input Voltage 420Vdc • DC Link Voltage is below • Check PCB DC Link voltage sensor parts 140Vdc WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
Part 5. Trouble Shooting Display code 25 Title Input Voltage high/low Cause of error Check point & Normal condition Input voltage is over limited 1. Input voltage abnormal (R-S-T) value of the product (140V 2. Outdoor unit main PCB assembly damage or less, 300V or more) (input voltage sensing part) ■ Error Diagnosis and Countermeasure Flow Chart Are there any power wire connections normal? No 1. Check L/N/G wiring conditions → Rewire them if abnormality found.
Part 5.
Part 5. Trouble Shooting Display code 27 Title Cause of error • Overload operation (Outdoor fan constraint, screened, blocked) Over-current on AC → DC • Wrong application of converter circuit Reactor Spec. • Burned PCB internal parts (PSC Module) Check point & Normal condition • Check outdoor fan constraint/ screened/ flow structure • Check Reactor Spec: 11A/ 13mH • Check for PCB internal part burn WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
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Part 5. Trouble Shooting Display code 40 Title Cause of error Check point & Normal condition AC Input current / Comp phase current sensing cir- • PCB sensing circuit part burned cuit - basic vlotage sensing error • Check power input connector, Comp output current sensing circuit WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
Part 5.
Part 5. Trouble Shooting Display code 43 Title Cause of error Sensor error of high pressure Check point & Normal condition • Bad connection of connector PCB • Bad connection high pressure connector • Defect of high pressure connector (Open/Short) • Defect of connector PCB (Open/Short) • Defect of outdoor main PCB.
Part 5. Trouble Shooting Display code 51 Title Over capacity Cause of error Check point & Normal condition • Over capacity Combination • Check the indoor unit capacity. • Check the combination table. Model Gross max.capacity Max.single indoor unit capacity A2UW18GFA0 24k 18k A3UW24GFA0 33k 24k Check Point • CH 51 1. Check the indoor unit capacity. 2. Check the combination table. Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code 53 Title If the data transmitted by the indoor unit is not received for 3 minutes continuously.
Part 5. Trouble Shooting Display code 60 Title Cause of error • Outdoor unit PCB Incorrect checksum of out- EEPROM misapplied door unit PCB EEPROM • Outdoor unit PCB EEPROM poor assmbly Check point & Normal condition EEPROM assembly WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
Part 5. Trouble Shooting Display code 61 Title High temperature in outdoor Cond. Pipe Cause of error Check point & Normal condition • Overload operation (Outdoor fan constraint, screened, blocked) • Outdoor unit heat exchanger contaminated • EEV connector displaced / poor EEV assembly • Poor Cond.
Part 5. Trouble Shooting Display code 62 Title Heat Sink High Cause of error Check point & Normal condition Inverter PCB heatsink temperature is over 85°C • ODU fan locking • Heatsink assembly of INV PCB assemble condition abnormal • Defect of temperature sensing circuit part defect of INV PCB ■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal ? No 1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4.
Part 5. Trouble Shooting Display code 65 Title Cause of error Heatsink Sensor error Inverter PCB heatsink sensor is open or short Check point & Normal condition • ODU fan locking • Heatsink assembly of INV PCB assemble condition abnormal • Defect of temperature sensing circuit part defect of INV PCB ■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal ? No 1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4.
Part 5. Trouble Shooting Display code 67 Title Fan Lock Error Cause of error Check point & Normal condition Fan RPM is 10RPM or less for 5 sec. when ODU fan starts or 40 RPM or less after fan starting.
Part 5. Trouble Shooting ► A4UW36GFA0/A8UW54GFA0 Display code Title DC PEAK (IPM Fault) 21 Cause of error Check point & Normal condition • Instant over current • Over Rated current • Poor insulation of IPM • An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant Pipe length.
Part 5. Trouble Shooting ■ 36k w | } ~ u u u Y^ Y] Y\ Y[ YZ YY YX zwtZ 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out V, V, W COMP connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5. Set the multi tester to diode mode. 6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
Part 5. Trouble Shooting ■ 54k U V W LED01M LED02M CN(L)_BRWON CN(N)_BLUE U,V,W CONNECTOR 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out CN(L), CN(N) connectors and U,V,W COMP Connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5. Set the multi tester to diode mode. 6.
Part 5. Trouble Shooting Display code 22 Title Max. C/T Cause of error Input Over Current(36k17A↑ 54k-29A↑) Check point & Normal condition 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
Part 5. Trouble Shooting Check Point 1. Check the power source.(230V ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (36k - Check output the CT Sensor : DC 2.5±0.2V) (54k - Check output pin 1.2 of the CT Sensor : 5V ) IN/I GND Red Black Vdc < Inverter PCB> Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code 23 Title DC Link High / Low Volt Cause of error • DC Link Voltage is above 420Vdc • DC Link Voltage is below 140Vdc Check point & Normal condition • Check CN_(L), CN_(N) Connection • Check Input Voltage • Check PCB DC Link voltage sensor parts WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
Part 5. Trouble Shooting Check Point 1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram) 2. Check the DC Link voltage at not operating(280V↑) 3. Check the DC Link voltage at Comp operating(340V↑) 4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture) ■ 36k IN/I GND Black Red Vdc Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting 54k Vdc N GND < Inverter PCB> L Vdc DC_LINK GND Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code Title Cause of error 25 Input voltage • Abnormal Input voltage (140Vac , 300Vac) Check point & Normal condition • Check the power source. • Check the components. ■ Error Diagnosis and Countermeasure Flow Chart Is input voltage normal ? No Check L~N Voltage is 230V±15% Yes Is Inverter PCB Normal? No Replace inverter PCB assembly Yes Recheck power and installation condition Check Point 1. Check the Input Voltage (L–N ➔ 230V±10%) 2.
Part 5. Trouble Shooting 36k IN/I GND Red Black Vdc 54k Vdc INPUT(V) GND < Input Voltage Sensing Check Point > < Inverter PCB> Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code Title 26 DC Compressor Position Cause of error • Compressor Starting fail error Check point & Normal condition • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts. WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
Part 5. Trouble Shooting Display code 27 Title Cause of error AC Input Instant over Current Error Check point & Normal condition 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor Inverter PCB input damage) current is over100A(peak) 3. Input voltage abnormal (L,N) for 2us 4. Power line assemble condition abnormal 5.
Part 5. Trouble Shooting Display code 29 Title Inverter compressor over current Cause of error Check point & Normal condition 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) Inverter compressor input 2. Compressor damage(Insulation damage/Motor current is over 30A damage) 3. Input voltage low 4. ODU inverter PCB assembly damage WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
Part 5.
Part 5.
Part 5. Trouble Shooting Display code Title 39 Transmission Error Between (PFC Micom → INV Micom) Cause of error Check point & Normal condition 1. Micom defect/Circuit defect 2. Different Micom S/W Version 3. ODU inverter PCB assembly damage Communication Error Between PFC Micom and INV Micom.
Part 5. Trouble Shooting Display code Title C/T Sensor Error 40 Cause of error Check point & Normal condition • Initial current error • Malfunction of current detection circuit. (Open / Short) • Check CT Sensor output voltage : 2.5Vdc ±5% WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
Part 5. Trouble Shooting 36k IN/I GND Red Black Vdc 54k Vdc INPUT(CT) GND < CT Sensing Check Point > < Inverter PCB> Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code Title Cause of error Check point & Normal condition 41 D-pipe sensor (Inverter) • Open / Short • Soldered poorly • Internal circuit error 1. Bad connection of thermistor connector 2. Defect of thermistor connector (Open/Short) 3. Defect of outdoor PCB 44 Air sensor • Open / Short • Soldered poorly • Internal circuit error 1. Bad connection of thermistor connector 2. Defect of thermistor connector (Open/Short) 3.
Part 5. Trouble Shooting Display code 43 Title Cause of error Sensor error of high pressure Is pressure sensor OK? (Check the value of pressure sensor. Cf. Output voltage is about 1.4V at 1500kPa) Abnormal value of sensor (Open/Short) No Check point & Normal condition • Bad connection of connector PCB • Bad connection high pressure connector • Defect of high pressure connector (Open/Short) • Defect of connector PCB (Open/Short) • Defect of outdoor main PCB.
Part 5. Trouble Shooting Display code 51 Title Over capacity Cause of error Check point & Normal condition • Over capacity Combination • Check the indoor unit capacity. • Check the combination table. Model Gross max.capacity Max.single indoor unit capacity A4UW36GFA0 48k 24k A8UW54GFA0 73k 36k Check Point • CH 51 1. Check the indoor unit capacity. 2. Check the combination table. Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code Title 53 Title Communication (Indoor → Outdoor) Cause of error • Communication poorly Check point & Normal condition • Power input AC 230V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal.
Part 5. Trouble Shooting Display code Title Cause of error Inverter PCB & Main EEPROM Access error EEPROM check sum error and Check SUM error 60 Check point & Normal condition 1. EEPROM contact defect/wrong insertion 2. Different EEPROM Version 3. ODU Inverter & Main PCB assembly damage WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
Part 5. Trouble Shooting 54k Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code 61 Title High temperature in outdoor Cond. Pipe Cause of error Check point & Normal condition • Overload operation (Outdoor fan constraint, screened, blocked) • Outdoor unit heat exchanger contaminated • EEV connector displaced / poor EEV assembly • Poor Cond.
Part 5. Trouble Shooting Display code 62 Title Heatsink High error Cause of error Check point & Normal condition Inverter PCB heatsink temperature is over 85°C 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condition abnormal 3. Defect of temperature sensing circuit part defect of INV PCB ■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal ? No 1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4.
Part 5. Trouble Shooting 36k PFCM : Measuring resistance between No.19,20 pin 54k PFCM : Measuring resistance between No.19,20 pin Copyright ©2014 LG Electronics. Inc. All right reserved. Only for training and service purposes - 102 - IPM : Measuring resistance between No.
Part 5. Trouble Shooting Display code 65 Title Heatsink Sensor error Cause of error Inverter PCB heatsink sensor is open or short Check point & Normal condition 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condition abnormal 3. Defect of temperature sensing circuit part defect of INV PCB ■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal ? No 1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4.
Part 5. Trouble Shooting 36k Location of SPM /PSCM /PFCM A: PSCM /PFCM B: SPM 54k PFCM : Measuring resistance between No.19,20 pin Copyright ©2014 LG Electronics. Inc. All right reserved. Only for training and service purposes - 104 - IPM : Measuring resistance between No.
Part 5. Trouble Shooting Display code 67 Title Fan Lock Error Cause of error Check point & Normal condition 1. ODU fan locking Fan RPM is 10RPM or 2. Heatsink assembly of INV PCB assemble condiless for 5 sec. when ODU tion abnormal fan starts or 40 RPM or 3. Defect of temperature sensing circuit part defect less after fan starting.
Part 5. Trouble Shooting 36k Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester 54k Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting Display code 73 Title AC input instant over current error (Matter of software) Cause of error Check point & Normal condition Inverter PCB input power current is over 48A(peak) for 2ms 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage (Insulation damage/Motor damage) 3. Input voltage abnormal (L, N) 4. Power line assemble condition abnormal 5.
Part 5. Trouble Shooting 36k L N < Noise Filter wiring Check Point > N L < Main PCB wiring Check Point > < Input Power Source Check Point > Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 5. Trouble Shooting 54k N L L N L N < Noise Filter wiring Check Point > L N N L < Input Power Source Check Point > Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 6. Service Order Part 6. Service Order 1. PCB Service Order ..........................................................................................................111 Copyright ©2014 LG Electronics. Inc. All right reserved.
Part 6. Service Order 1. PCB Service Order A2UW18GFA0/A3UW24GFA0 1 4 Remove Top Cover and Control Box Cover 2 7 5 8 Replace New PCB Remove PCB Screws (6ea) 3 Hang wires up on the Rib from Case and Insert PCB into Control Box Take Terminals from PCB with a tool 6 Raise PCB and take terminals from PCB Copyright ©2014 LG Electronics. Inc. All right reserved.
P/NO : MFL68280201 January, 2014
