LG ARUN Series Service Manual Download Page 102

Page: 102 / 134

Troubleshooting Guide

- 102 -

LGE Internal Use Only

40*

Master

401

Slave

402

Inverter compressor CT
sensor error

Error

No.

Error Type

Error Point

Main Reasons

Micom input voltage isn't
within 2.5V ±0.3V at initial
state of power supply

1. Input voltage abnormal (R~S/S~T/T~R)
2. ODU inverter PCB damage

(CT sensing part)

■

Error Diagnosis and Countermeasure Flow Chart

Is input voltage normal?

Yes

Recheck power and installation condition

Check
R~S/S~T/T~R Phase voltage : 460V

10% (3Ø 460V)

208/230V

10% (3Ø 208/230V)

→

Check connection condition and wiring if power is

abnormal

Is inverter PCB assembly normal?

Yes

Replace inverter PCB assembly

* Measuring input voltage

* Inverter PCB assembly

* LGMV Part

Summary of Contents for ARUN Series

Page 1: ...r Unit SERVICE MANUAL R410A MODEL ARUN Series CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com R410A ...

Page 2: ... Only Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions 3 Part 1 General Information 10 Model Names 11 External Appearance 12 Combination of Outdoor Units 14 Nomenclature 15 Outdoor Units Information 16 Part 2 Outdoor Units 19 Part 3 PCB Setting and Test Run 57 Part 4 Trouble shooting guide 69 ...

Page 3: ...of injury or damage to properties only Be sure not to do Be sure to follow the instruction WARNING Installation Have all electric work done by a licensed electrician according to Electric Facility Engineering Standard and Interior Wire Regulations and the instructions given in this manual and always use a special circuit If the power source capacity is inadequate or electric work is performed impr...

Page 4: ... for strong wind or earthquake and install the unit at the specified place Improper installation may cause the unit to top ple and result in injury Do not install the product on a defective installation stand It may cause injury accident or damage to the product When installing and moving the air condition er to another site do not charge it with a different refrigerant from the refrigerant specif...

Page 5: ...t the refrigerant concentration from exceeding the safety limit when the refrigerant leaks Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceed ed Should the refrigerant leak and cause the safety limit to be exceeded harzards due to lack of oxy gen in the room could result Do not damage or use an unspecified power cord There is risk of fire electric s...

Page 6: ...o not open the inlet grille of the product during operation Do not touch the electro static filter if the unit is so equipped There is risk of physical injury electric shock or product failure Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product Do not install the product where the noise or hot air from the outdoor uni...

Page 7: ...ch as cutting the finger Also the damaged fin may result in degradation of capacity When installting the unit in a hospital com munication station or similar place provide sufficient protection against noise The inverter equipment private power generator high frequency medical equipment or radio com munication equipment may cause the air condition er to operate erroneously or fail to operate On th...

Page 8: ...allation area does not deteri orate with age If the base collapses the air conditioner could fall with it causing property damage product failure or personal injury Install and insulate the drain hose to ensure that water is drained away properly based on the installation manual A bad connection may cause water leakage Be very careful about product transportation Only one person should not carry t...

Page 9: ...eason Do not touch any of the refrigerant piping during and after operation It can cause a burn or frostbite Do not operate the air conditioner with the panels or guards removed Rotating hot or high voltage parts can cause injuries Do not directly turn off the main power switch after stopping operation Wait at least 5 minutes before turning off the main power switch Otherwise it may result in wate...

Page 10: ...d service purposes LGE Internal Use Only Part 1 General Information 1 Model Names 11 1 1 Indoor Unit 11 1 2 Outdoor Unit 11 2 External Appearance 12 2 1 Indoor Unit 12 2 2 Outdoor Unit 13 3 Combination of Outdoor Units 15 4 Nomenclature 17 4 1 Indoor Unit 17 4 2 Outdoor Unit 17 ...

Page 11: ...asic C Plasma ARNU073 SE 2 ARNU093 SE 2 ARNU123 SE 2 ARNU153 SE 2 ARNU073 TJ 2 ARNU093 TJ 2 ARNU123 TJ 2 ARNU183 TL 2 ARNU243 TL 2 ARNU073 TE 2 ARNU093 TE 2 ARNU123 TE 2 ARNU153 TE 2 ARNU183 TE 2 ARNU243 TP 2 ARNU283 TP 2 ARNU073 BHA2 ARNU093 BHA2 ARNU123 BHA2 ARNU153 BHA2 ARNU183 BHA2 ARNU243 BHA2 ARNU073 B1G2 ARNU093 B1G2 ARNU123 B1G2 ARNU153 B1G2 ARNU073 B3G2 ARNU093 B3G2 ARNU123 B3G2 ARNU153 B...

Page 12: ...HP 10HP 12HP 14HP 16HP 18HP 20HP 22HP 24HP 6 5ton 8 0ton 9 5ton 11 0ton 12 5ton 14 5ton 16 0ton 17 5ton 19 0ton 3Ø 460V 60Hz 076DT2 096DT2 115DT2 134DT2 154DT2 173DT2 192DT2 211DT2 230DT2 3Ø 208 230V 60Hz 076BT2 096BT2 115BT2 154BT2 173BT2 192BT2 211BT2 230BT2 Power Supply 26HP 28HP 30HP 32HP 20 5ton 22 5ton 24 0ton 25 5ton 3Ø 460V 60Hz 250DT2 270DT2 290DT2 310DT2 ...

Page 13: ...U073SE 2 ARNU093SE 2 ARNU123SE 2 ARNU153SE 2 ARNU183S3 2 ARNU243S3 2 ARNU093VEA2 ARNU123VEA2 ARNU183VJA2 ARNU243VJA2 Floor Standing With case ARNU073CEA2 ARNU093CEA2 ARNU123CEA2 ARNU153CEA2 ARNU183CFA2 ARNU243CFA2 Without case ARNU073CEU2 ARNU093CEU2 ARNU123CEU2 ARNU153CEU2 ARNU183CFU2 ARNU243CFU2 Ceiling Concealed Duct High Static ARNU073BHA2 ARNU093BHA2 ARNU123BHA2 ARNU153BHA2 ARNU183BHA2 ARNU24...

Page 14: ...erved Only for training and service purposes LGE Internal Use Only External Appearance 2 2 Outdoor Units 460V ARUN076DT2 ARUN096DT2 ARUN115DT2 ARUN134DT2 ARUN154DT2 ARUN173DT2 ARUN192DT2 ARUN211DT2 ARUN230DT2 ARUN250DT2 ARUN270DT2 ARUN290DT2 ARUN310DT2 ...

Page 15: ...ctronics Inc All right reserved Only for training and service purposes LGE Internal Use Only External Appearance 2 2 Outdoor Units 208 230V ARUN076BT2 ARUN096BT2 ARUN115BT2 ARUN154BT2 ARUN173BT2 ARUN192BT2 ARUN211BT2 ARUN230BT2 ...

Page 16: ... Units Capacity 60Hz Module 8 10 12 14 16 8HP 6 5ton 1 1 10HP 8 0ton 1 1 12HP 9 5ton 1 1 14HP 11 0ton 1 1 16HP 12 5ton 1 1 18HP 14 5ton 2 1 1 20HP 16 0ton 2 1 1 22HP 17 5ton 2 1 1 24HP 19 0ton 2 1 1 26HP 20 5ton 2 1 1 28HP 22 5ton 2 2 30HP 24 0ton 2 1 1 32HP 25 5ton 2 2 System Number of Units Capacity 60Hz Module 8 10 12 8HP 6 5ton 1 1 10HP 8 0ton 1 1 12HP 9 5ton 1 1 16HP 12 5ton 2 2 18HP 14 5ton ...

Page 17: ... P and C O System with Indoor Unit using R410A LGETA U Ex URN Combinations of functions A Basic function L Neo Plasma Wall Mounted C Plasma Ceiling Cassette G Low Static ART COOL Type Panel Color B Blue D Wood M Metal R Mirror W White Wood V Silver E Red G Gold 1 Kiss Photo changeable ARU N D 096 T 2 Generation Air Discharge Type S Side Discharge T Top Discharge Electrical Ratings 8 3Ø 380 415V 50...

Page 20: ... 20 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Function 21 Replacement procedure for Compressor 57 ARUN Series ...

Page 21: ...ure protection control 28 3 2 Discharge temperature control 29 3 3 Inverter protection control 29 3 4 Liquid back control 30 3 5 Phase detection 30 3 6 Pressure switch 30 4 Other control 31 4 1 Initial setup 31 4 2 Instant indoor unit checking mode 33 4 3 Emergency operation 34 4 4 Refrigerant Auto Charging 36 4 5 Refrigerant Checking Function 38 4 6 Pump Down 40 4 7 Pump Out 41 4 8 Auto Back Up F...

Page 22: ...are decided simultaneously 1 1 Normal operation 1 Basic control Compressor Fan Main EEV 4way valve Subcooling Indoor Unit EEV EEV Fuzzy control Fuzzy control Full open Off Fuzzy control Superheat fuzzy control Normal minimum pulse Avoiding control of high discharge temperature Subcooling fuzzy control Fuzzy control Fuzzy control Fuzzy control On Cooling operation Heating operation Actuator stop st...

Page 23: ...emperature equivalent to low pressure C F 2 Subcooling EEV control about 15 C 58 F Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during cooling mode The degree of Subcool Tcondensation Tliquid Tliquid temperature at outlet of subcooler C F Tcondensation condensation temperature equivalent to high pressure C F 3 Avoiding excessive high discharge temp...

Page 24: ...process ends if compressor protection control starts Normal control OFF 100 pulse Max pulse Normal control OFF 40Hz Ending Normal control OFF Main pluse Max pulse Normal control ON Setting Value Running Normal control OFF Normal control Max pulse Normal control OFF 25Hz Starting Hot gas bypass valve 4way valve Subcooling EEV Main EEV FAN Constant Speed Compressor Inv Compressor Component OFF Min p...

Page 25: ...pulse Normal control Normal control Ending ON 1200 pulse 1200 pulse OFF Running OFF Min pulse Normal control Normal control Starting Hot gas bypass valve 4way valve Subcooling EEV Main EEV FAN Constant Speed Compressor Inv Compressor Component Normal control OFF Normal control Max pulse Normal control OFF 25Hz Starting Normal control ON Min pulse Max pulse Normal control ON Setting Value Running N...

Page 26: ...ompressor Component Min pulse Normal control OFF Ending 1200 pulse 1200 pulse OFF Running Min pulse Normal control OFF Starting Thermo off unit EEV Thermo on unit EEV Fan Component Function 2 2 Defrost Defrost operation eliminates ice attached on heat exchanger recovering performance of heat exchanger Each cycle component operates as following table during defrost operation Ending condition 1 All ...

Page 27: ... pulse After 15 min Before 15 min Min pulse Note OFF OFF Max pulse Max pulse Stop OFF 0Hz Operation Hot gas bypass valve 4way valve Subcooling EEV Main EEV FAN Constant Speed Compressor Inv Compressor Component After 15 min Before 15 Min ON After 60 min After 15 min Before 15 min Min pulse After 15 min Before 15 min Min pulse Note OFF OFF Max pulse Max pulse Stop OFF 0Hz Operation Hot gas bypass v...

Page 28: ... 1min 5Hz 4sec 100RPM 4sec Ps 242 kPa 35 1 psi Frequency holding Normal control Ps 268 kPa 38 9 psi Normal control Ps 307 kPa 44 5 psi Off 2 1 3 Function 3 1 Pressure protection control 3 1 1 Pressure control on cooling mode High pressure control Low pressure control Frequency holding frequency or RPM is not increasing can decrease 3 Protection control Pressure Range Compressor Fan Hot_gas Pd 4003...

Page 29: ...range EEV Keep current control 98 C 208 F Tdis 103 C 217 F SH control Tdis 98 C 208 F Frequency down const Comp off Liquid injection on No frequency up System stop 105 C 221 F Tdis 112 C 234 F Tdis 115 C 239 F Temperature range Compressor On Liquid injection Keep state OFF below 20 C 212 F Pressure control Tdis 98 C 208 F Off Max limit 490 pulse Max limit 490 pulse Subcooling EEV Max limit 300 pul...

Page 30: ...The state of pressure sensing switch is normally on It has small electric current from 220V AC Never touch the connecting terminal with hand nor short two wires directly 3 4 Liquid back control Cooling mode Heating mode The logic starts after 9 min on heating mode and 4 min on cooling mode from the compressor running Tdis Tc 12 C 54 F Discharge temperature Indoor unit s EEV Normal SH control Tdis ...

Page 31: ...ial setup 1 Step 1 factory setting value display Factory setting value is displayed in 7 segment on PCB for 24sec All dip switches must be set properly before step 1 4 Other control Power is on Master model code is displayed 3sec Slave model code is displayed 3sec Total capacity including sub units is displayed 2sec Heat pump Display 2 is default value Cooling only no display Factory setting 25 is...

Page 32: ...n PCB and fan PCB isn t normal 105 is displayed in 7 segment If error is displayed check corresponding wires 4 Step 4 Auto addressing of indoor units Auto addressing begins when address red button in Main PCB is pressed for 6 sec During auto addressing 7 segment on main PCB displays 88 After auto addressing the number of indoor units is displayed in 7 segment for 30 sec The address of each indoor ...

Page 33: ...utomatic emergency operation refer to page Manual emergency operation Manual back up function 1 Check which compressor is broken refer to Trouble Shooting Guide 2 Turn off the power 3 Set the dip S W of defective outdoor unit Inverter compressor defect dip S W No 3 Unit defect dip S W No 4 4 Turn on the power MASTER SLAVE Normal INV C INV C MASTER SLAVE Inv comp Fail of Slave INV C INV C 1 2 3 4 5...

Page 34: ...ntil 508 is displayed Judging sensor normality Error Display Refrigerant Auto Charging Main pcb LED Note 4 Press the black button on the main PCB for 2 sec Main PCB SW01V Press the black button for 2 sec after turning off all of SIP switch Refrigerant Checking Press the black button until 608 is displayed Refrigerant Checking Don t Perform Sensor Checking No Yes Yes No Completed Note 1 Sensor chec...

Page 35: ...2nd number represents error content code 2 Last number represents outdoor unit number 1 Master 2 Slave 1 3 Slave 2 4 Slave 3 Indoor unit number follows auto addressing number ex Indoor unit No 2 pipe inlet temperature sensor error ex Outdoor master unit liquid pipe temperature sensor error 1 Outdoor Air Temperature 2 Heat Exchanger 1 3 Heat Exchanger 2 4 Inverter Compressor Discharge Temperature 5...

Page 36: ... Press the black button for 2 sec after turning off all of dip S W Yes No Press the black button on main PCB Press until 508 is displayed Main PCB SW01V IDU runs with cooling mode In designated order Main PCB SW01V Press the black button IDU and ODU are turned off when Auto Charging is completed Close the valve Press the black button 1 Refrigerant Auto Charging Process Main PCB SW01V Completed 2 N...

Page 37: ...ly Function CAUTION 1 Guaranteed temperature range Error will occur if temperature is out of range IDU 20 C 68 F 32 C 90 F ODU 0 C 32 F 43 C 77 F 2 For refrigerant charging use designated device only Capillary Assem Set 3 Set the IDU wired remote controller temperature sensing mode as IDU 4 Be careful that IDU should not be thermo off Error contents about auto refrigerant charging function 1 Tempe...

Page 38: ...ress the black button for 2 sec after turning off all of dip S W Completed Press the black button on main PCB Press until 608 is displayed Main PCB SW01V IDU runs with cooling mode in order Main PCB SW01V Press the black button on main PCB Main PCB SW01V Note 1 IDU ODU are turned off Note Judging Refrigerant Amount Note 1 In case air temperature is out of guaranteed temperature refrigerant checkin...

Page 39: ...t check ing and the system will be OFF 2 Excess of Refrigerant 619 After remove the 20 of calculated total refrigerant recharge the refrigerant by using Refrigerant Auto Charging Function 3 Scarcity of Refrigerant 629 Charge the refrigerant by using Refrigerant Auto Charging Function 4 Impossible to Judge 639 IF the system is not in order check the other problem except refrigerant CAUTION 1 Guaran...

Page 40: ...ss the black button Satisfy low pressure target Main PCB SW02B Main PCB SW01V Elbow Ball Valve Gas Pipe Ball Valve Liquid Pipe ODU SVC V V Setting Close Open Elbow Ball Valve Gas Pipe Ball Valve Liquid Pipe ODU SVC V V Setting Close Close Note If is displayed close gas SVC V V of all ODU immediately If low pressure descends below 229 kPa 33 2 psi the system turns off automatically Close the gas SV...

Page 41: ... out completed Press the black button Satisfy low pressure target Main PCB SW01B SW02B Main PCB SW01V Elbow Ball Valve Gas Pipe Ball Valve Liquid Pipe ODU SVC V V Setting Close Open Elbow Ball Valve Gas Pipe Ball Valve Liquid Pipe ODU SVC V V Setting Close Close Note If is displayed close gas SVC V V of all ODU immediately If low pressure descends below 229 kPa 33 2 psi the system turns off automa...

Page 42: ...or pump out operation 2 Operate pump out 3 Close gas pipe of unit after completion 4 End pump out 5 Close common pipe 6 Eliminate refrigerant in common pipe after opening the common pipe of corresponding ODU Replace compressor and perform vacuum 7 Add the refrigerant with auto charging function gas pipe liquid pipe gas pipe liquid pipe Comp failure unit Heating mode Slave Heating mode Master Funct...

Page 43: ...mer every 6 hours Caution 1 Request SVC immediately if error occurs 2 Auto back up is set up to 1 inverter Comp 3 If Inverter Comp Auto Back up starts error displays for 10 min every 6 hours 4 Error displays continuously at the corresponding ODU Inverter compressor failure NO 21 22 26 27 error occur Operation INV Comp Auto Back up Operation IDU ODU display error for 10 min IDU remote controller er...

Page 44: ...of constant speed compressor failure by backing up compressor automatically Caution 1 Request SVC immediately if error occurs Constant speed comp failure Operation Operation possible Constant speed Comp Auto Backup ODU Main PCB Display Constant speed comp permanent back up starts Error Display 173 Unit No Error clear IDU ODU off Example Slave1 Unit constant speed Comp failure No 173 30min delay OD...

Page 45: ...se the function is not used set the dip S W OFF and reset the power 3 If ODU RPM changes cooling capacity may go down Main PCB Power Reset Dip S W No 12 14 ON Master ODU SW01S Master ODU SW01B STEP 1 Max RPM 510 Black button 1 time red button 1 time STEP 2 Max RPM 450 Black button 2 times red button 1 time STEP 3 Max RPM 400 Black button 3 times red button 1 time Setting Complete SW01V SW02V 8 hou...

Page 46: ...w chart Timer A 10min T_out T_max T_max T_out Start Condition Setting Timer A 0 Timer B 0 Timer B 8hr Start Yes No No Tmax 0 Yes Yes Timer C 9hr End Condition Setting End No Timer C 0 No End Timer B 0 Step 1 Step 2 Step 3 Error RPM_max 510 RPM_max 450 RPM_max 400 Timer A increase Timer B increase Timer C increase Function ...

Page 47: ...tatic pressure mode Max RPM 900 Master ODU Main PCB SW02B NO 12 Dip S W Master Main PCB D W ON No 11 14 Vacuum mode setting ODU V V OPEN Main Lev SC Lev OPEN IDU Lev OPEN ODU power reset Press the black button Main PCB 5 sec Main PCB SW01S Main PCB SW02B Main PCB SW01V ODU operation stops during vacuum mode Compressor can t operate Vacuum mode setting method Vacuum mode cancellation method Master ...

Page 48: ...occurs in ODU main PCB and thus making error analysis cause possible Saving process Making Data Save EEP data data saving place select file save Data Loading Method Press the black button 5 sec EEPROM Main Micom data Loading EEPROM data save to PC by using Save EEP data in LGMV Yellow LED LED01C stops when data is loading After completion it is starts blinking about 20 sec IDU ODU stop Function ...

Page 50: ... if high low pressure common pipe liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Check if there are any problems in automatic addressing or not Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units 1 Checks Before Test Run CAUTION when cutting main power of the Multi V Always apply main power of ...

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

Page 52: ...lectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 1 Location of setting Switch 3 DIP Switch Setting Test Run Main PCB SW01B DIP S W SW02B DIP S W 7 Segment SW02V Auto addressing ...

Page 53: ...7 segment in 5 seconds after applying the power This number represents the setting condition For example represents 3Ø 208 230V 20HP heat pump Master model code Slave1 model code total capacity 2 25 140 1 255 Master model code 1 255 Slave1 model code 1 255 Slave2 model code 8 32HP HP number sum of master capacity and slave capacity No display cooling only 2 heat pump 3 Sync 25 Nomal 140 3Ø 208 230...

Page 54: ...9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ...

Page 55: ... 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2...

Page 56: ...3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SW01B Setting Slave Remarks SW02B Setting Function SW01B Setting Slave Remarks SW02B Setting Function 1...

Page 57: ...t 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 Replacement procedure for Compressor 58 1 1 Replacement procedure 58 Replacement procedure for Compressor ...

Page 58: ...ing the fixing bolts of compressor 7 Remove the rubber caps put on the suction and discharge pipe of the new compressor to release the sealing nitrogen gas Take note that oil may spout due to the pipe inside pressure if the plug put on the equalizing seat is removed before removing of rubber cap 8 Fasten equalizing pipe with nut 10 3 13 3 lbf ft 9 Braze the suction and discharge pipe with brazing ...

Page 60: ... from main component failure 61 2 Checking Method for Key Components 2 1 Compressor 62 2 2 Fan Motor 63 2 3 Electronic Expansion Valve 64 2 4 Phase Bridge Diode Checking Method 67 2 5 Inverter IPM Checking Method 68 2 6 Fan IPM Checking Method 69 2 7 UW1 chassis 2Fan 69 2 8 Other 71 3 Self diagnosis function 72 Trouble shooting guide ...

Page 61: ...ilure fre quent defrosting No operation sound after switching ON the power supply Heating failure frozen outdoor heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Motor failure bad ventilation around outdoor heat exchanger Bad connector contact Coil failure EEV clogged EEV clogged...

Page 62: ...t failure of the inverter occurred 2 You can use rectification voltmeter if using commercial frequency tester when measuring output values of the inverter when measuring absolute values Accurate measuring values cannot be obtained with a gen eral movable tester For analog and digital mode 1 2 Is how long power on during operation Does failure appears again when starting operation Method to measure...

Page 63: ...heck that parts are firmly secured by tightening screws 4 Check connection of polarity 5 Check short circuit and grounding Measure winding resistance of the motor coils 16 8 5 Ω Replace the fuse if there is defect Fuse 800V 30A Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as speci fied in above 1 through ...

Page 64: ...uously in the ON state motor will not operate smoothly and start vibrating EEV valve operation ø1 ON ON OFF OFF OFF OFF OFF ON ON ON OFF ø2 ON ON ON ON OFF OFF OFF ON ON ON OFF ø3 OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF ø4 OFF OFF OFF OFF OFF ON ON ON ON ON OFF Output ø No Output state 1 2 3 4 5 6 7 8 9 10 11 Valve open Angle close pulse open Full open 1350 pulses At power ON open angle signal of...

Page 65: ... Internal Use Only Checking Method for Key Components EEV Coil and body Outdoor unit Remove and assemble the coil Lead wire Coil part Body A part Remove Assemble Grip the A part tightly and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body ...

Page 66: ...tion 1 Check the resistance between coil terminal red white red yellow red orange red blue 2 If the estimated resistance value is in 52 3Ω then the EEV is normal Replace EEV Outdoor unit 1 Check the resistance between coil terminal brown white brown yellow brown orange brown blue 2 If the estimated resistance value is in 150 10Ω then the EEV is normal Replace EEV Indoor unit 1 Operate indoor unit ...

Page 67: ...er to resistance mode and measure If the value is small 0 Ω or high hundreds M Ω PCB needs to be replaced 6 In case that bridge diode is damaged check if inverter PCB assembly IPM is needed to be replaced Red and black are the measuring terminals of multi tester Internal circuit diagram Appearance R red 0 4 V 0 7 V S red 0 4 V 0 7 V T red 0 4 V 0 7 V R black 0 4 V 0 7 V S black 0 4 V 0 7 V T black...

Page 68: ...ds MΩ PCB needs to be replaced IPM damaged 5 In the measured value with resistance mode should be within 28K Ω 10 6 In case measured value is different from the table PCB needs to be replaced PCB damaged Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 28K Ω 10 Open V terminal red 28K Ω 10 Open W terminal red 28K Ω 10 Open P terminal red N te...

Page 69: ...IPM dam aged 5 In case the measured value is open hundreds KΩ measure resistance mode and the value should be within 35 KΩ 10 as shown below table 6 If the measured value is different from the value given in the table PCB is needs to be replaced Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 35K Ω 10 Open V terminal red 35K Ω 10 Open W term...

Page 70: ...increase continuously without short value is 0 then the resistor is normal 3 Set the multi meter to resistance mode confirm that the resistance value of the resistor is around 270 kOhm Check and replace inferior components Guide of check electrolytic capacitor and resistor for voltage distribution In case that the control box is opened and before checking electrical parts it should be checked that...

Page 71: ...ailure of indoor fan motor lock When the addressing signal doesn t respond for 3mins suddenly while the indoor unit gets the calling signal from the outdoor unit Master Outdoor Unit Inverter Compressor Drive IPM Fault Slave Outdoor Unit Inverter Compressor Drive IPM Fault Master Outdoor Unit Inverter Board Input Current excess RMS Slave Outdoor Unit Inverter Board Input Current excess RMS DC charg...

Page 72: ...sure of Slave Outdoor Unit Low Pressure of Master Outdoor Unit Low Pressure of Slave Outdoor Unit Transmission error Inverter Converter Transmission error Inverter Converter 1 3 2 2 1 3 3 2 1 3 4 2 1 3 5 2 1 3 8 2 Master Outdoor Unit input voltage is over 487V or below 270V Slave Outdoor Unit input voltage is over 487V or below 270V The First Start Failure by Master Outdoor Unit Inverter Compresso...

Page 73: ...igh Pressure Sensor Fault Slave Outdoor Unit High Pressure Sensor Fault Master Outdoor Unit Air Temperature Sensor Fault Slave Outdoor Unit Air Temperature Sensor Fault Master Outdoor Unit Heat Exchanger Temperature Sensor A Fault Slave Outdoor Unit Heat Exchanger Temperature Sensor A Fault Master Outdoor Unit Suction Temperature Sensor Fault Slave Outdoor Unit Suction Temperature Sensor Fault Mas...

Page 74: ...power of Master Outdoor unit Reverse connection of R S T power of Slave outdoor unit Mixing Installation of Sub Outdoor Unit Inverter PCB EEPROM Error of Master Outdoor Unit Inverter PCB EEPROM Error of Slave Unit Master Outdoor Unit Fan Lock Slave Outdoor Unit Fan Lock Constant CT Sensor Error of Master Outdoor Unit Constant CT Sensor Error of Slave Outdoor Unit PFC CT Sensor Error of Master Outd...

Page 75: ...Master Outdoor Unit Fan First Position Sensing Failure Slave Outdoor Unit Fan First Position Sensing Failure Communication Fail Between Master Outdoor Unit Main MICOM and EEPROM or omitting EEPROM Communication Fail Between Slave Outdoor Unit Main MICOM and EEPROM or omitting EEPROM Communication Fail Between Master Outdoor Unit Fan MICOM and EEPROM or omitting EEPROM Communication Fail Between Sl...

Page 76: ...r 95 C Master Outdoor Unit Fan PCB Heat Sink Temperature Sensor open or short Slave Outdoor Unit Fan PCB Heat Sink Temperature Sensor open or short Failure of operation mode conver sion at Master Outdoor Unit Failure of operation mode conver sion at Slave Outdoor Unit Master Outdoor Unit Constant Speed Compressor Fault Slave Outdoor Unit Constant Speed Compressor Fault Master Outdoor Unit Liquid p...

Page 77: ...en or less than 100Ω short Error occurs Refer Resistance value maybe change according to temperature of temp sensor It shows according to criteria of current temperature 5 margin Normal Air temp sensor 10 C 50 F 20 7 kΩ 25 C 76 F 10 kΩ 50 C 122 F 3 4 kΩ Pipe temp sensor 10 C 50 F 10 kΩ 25 C 76 F 5 kΩ 50 C 122 F 1 8 kΩ Error diagnosis and countermeasure flow chart Is sensor properly connected to PC...

Page 78: ...ld be turned on before Auto Addressing 03 No communication between cabled remote controller indoor unit Error No Error Type Error Point Main Reasons The remote controller did not receive the sig nal from indoor unit during specific time 1 Remote controller fault 2 Indoor unit PCB fault 3 Connector fault Wrong connection 4 Communication cable problem Error diagnosis and countermeasure flow chart CN...

Page 79: ...filled half with condensate water half level of float switch Is drain pump working Sound drain noise contact etc Replace float switch Replace Indoor PCB or reconnect the connector Yes Yes No No Is Float switch short On measuring its resistance No Yes Drain pump blocked by foreign particles Yes No In indoor unit PCB Does the terminal voltage for drain pump has 220V output Replace indoor unit PCB Re...

Page 80: ...nly for training and service purposes LGE Internal Use Only Indoor PCB drain pump connector Check input of 220V Marked as CN DPUMP float A Point to check rotating Float switch Housing CN FLOAT Float switch connector Standard of drain pipe head height slope MAX 450 700mm 27 6 inch ...

Page 81: ...door PCB fault Replace after checking Re connect communication cable No Yes Indoor PCB fault Replace after checking Note1 communication from IDU is normal if voltage fluctuation 9V 9V exists when checking DC voltage of communication terminal between IDU and ODU Is total number of indoor units connected displayed after auto addressing No END If the DC voltage between communication terminal A B of i...

Page 82: ...sure flow chart Check mode selection setting of wired remote controller Outdoor main PCB dip switch no 5 Cooling or no 6 heating is in On different mode operation error may occur because the operation mode is fixed by dip switch setting Dip switch Setting Dissolution method CH07 with remote controller 1 Error removal method Turn off remote controller by pressing the On Off button on the cabled rem...

Page 83: ...amage Error No Error Type Error Point Main Reasons Indoor unit EEPROM error Error diagnosis and countermeasure flow chart After replacing the indoor unit PCB make sure to be done to do Auto addressing and input the address of central control If ODU Dry Contact function is set different mode operation error may be occurred because the operation mode is fixed Replace the indoor unit PCB and then mak...

Page 84: ...or connection proper Yes No Connect properly Is fan motor normal Replace indoor unit fan motor It is normal when check hall sensor of indoor fan motor as shown below Yes No k Replace indoor unit PCB Checking connection state of fan motor connector 1 4 5 6 7 1 5 6 7 4 4 4 4 Each termainl with the tester Tester TH chassis hundreds kΩ hundreds kΩ hundreds kΩ hundreds kΩ TD chassis Normal resistance 1...

Page 85: ...ror Type Error Point Main Reasons Indoor unit doesn t get sig nal from ODU for 3 minutes continuously 1 Indoor 485 communication PCB fault 2 After PCB replacing auto addressing was not done Error diagnosis and countermeasure flow chart Yes No After Auto addressing error code disappears Replace indoor unit 485 communication PCB No After ODU main PCB reset error code disappears END Yes ...

Page 86: ... resistance between compressor terminal and pipe over 50MΩ Replace compressor if abnormality found Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly if abnormality found Is compressor Wire connection condition normal No 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor...

Page 87: ...rvice purposes LGE Internal Use Only Check joining conditon IPM joining point Heat sink cooling fan Measuring insulation resistance between Comp output terminal and chassis Measuring resistance between each terminal of compressor Heat sink cooling fan connector Compressor wire connector connection point ...

Page 88: ...ressure Reassemble or manage if abnormality found Is inverter PCB assembly power connection normal No Check connection between inverter PCB assembly and bridge diode misconnection disconnection wiring again if abnormality found Yes Is input voltage normal No Check R S S T T R phase voltage 460 10 3Ø 460V 208 230 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Yes Is inver...

Page 89: ...ll right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Inverter PCB bridge diode wiring 3Ø 460V Check joining condition Compressor wire connector connection Measuring input voltage ...

Page 90: ...CB assembly damage DC Link voltage sensing part 5 Input voltage low Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Yes Yes Recheck power and installation condition Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Is inverter PCB assembly power connection normal No Check connection betwee...

Page 91: ...roubleshooting Guide 91 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Inverter PCB bridge diode wiring 3Ø 460V Measuring input voltage ...

Page 92: ...89V or more 1 Input voltage abnormal R S S T T R 2 Outdoor unit inverter PCB assembly dam age input voltage sensing part Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Yes Recheck power and installation condition Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Is inverter PCB assembly n...

Page 93: ...ing distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor refer to page 63 2 Check insulation resistance between compressor terminal and pipe over 50MΩ Replace compressor if abnormality found Are the resistance Between eac...

Page 94: ...oting Guide 94 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connection ...

Page 95: ...sure Flow Chart Is the Reactor Wire connection Normal No Yes Yes Recheck Power and Installation 1 Check Inverter PCB Ass y R S Tconnection 2 Check the wiring status 1 Check the cooling fan connection 2 Check the cooling fan wiring status 3 Check the cooling fan output voltage Main PCB Assy CN15 FAN connctor voltage AC 220V Change the Main PCB when no output voltage 4 Check the cooling fan motor op...

Page 96: ...abnormal R S T 2 ODU inverter PCB damage DC Link voltage sensing part Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Replace inverter PCB assembly Is inverter PCB assembly normal No Yes Measuring in...

Page 97: ...n normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check resistance between each terminal of compressor refer to page 63 2 Check insulation resistance between compressor terminal and pipe over 50MΩ Replace compressor if abnormality found Is compressor Wire c...

Page 98: ...98 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connection Measuring input voltage ...

Page 99: ...ressor at main outdoor unit Over increase discharge temperature of constant compressor at main con stant outdoor and sub con stant outdoor unit 32 Master 321 Slave 322 33 Master 331 Slave 332 No Yes Is the resistance of discharge temperature sensor normal Replace discharge temperature sensor Is the amount of refrigerant normal refer refrigerant part Weld reconnect the cracked portion and recharge ...

Page 100: ...uccessive compres sor off due to over increase of high pres sure by high pressure sensor Over increase of dis charge pressure of compressor 34 Master 341 Slave 342 Is service valve opened No Open service valve Are transmission cable pipe connection normal Yes No Is refrigerant amount normal refer refrigerant part Yes No Is fan normal Indoor fan during heating Outdoor fan during cooling Yes No Yes ...

Page 101: ...e valve opened Open service valve Are transmission cable piping normal Yes No Is amount of refrigerant normal refer refrigerant part Yes No Is fan normal in heating outdoor fan in cooling indoor fan Yes Adjust the amount of refrigerant Additive charge check transmission piping correction Check and replace related parts error 105 108 reference Is strainer Ok No Replace the strainer No Replace the p...

Page 102: ...V at initial state of power supply 1 Input voltage abnormal R S S T T R 2 ODU inverter PCB damage CT sensing part Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal No Ye...

Page 103: ...ster 471 Slave 472 Error diagnosis and countermeasure flow chart Check the resistance inverter compressor discharge temperature sensor Sensor connection to PCB is normal Is the resistance of sensor normal Insert sensor connector to PCB properly Replace sensor Replace corresponding outdoor PCB Yes No No Is sensor resistance value same as temperature value of LGMV Yes Yes No Replace corresponding se...

Page 104: ...connector 2 Defect of high pressure connector Open Short 3 Defect of outdoor PCB Error No Error Type Error Point Main Reasons Abnormal value of sensor Open Short Abnormal value of sensor Open Short Sensor error of low pressure Sensor error of high pressure 42 Master 421 Slave 422 43 Master 431 Slave 432 Is sensor connected to PCB correctly Connect sensor to PCB correctly Yes No No After replacemen...

Page 105: ... door unit heat exchanger A B Compressor suc tion temperature sensor error 44 Master 441 Slave 442 46 Master 461 Slave 462 45 Master 451 Slave 452 48 Master 481 Slave 482 Is sensor connected to PCB correctly Is sensor value correct Connect sensor to PCB correctly Replace sensor Replace corresponding outdoor unit PCB Yes No No Yes If value is 100kΩ open or 100 Ω short error occurs NB Resistance val...

Page 106: ...er 1 Input Voltage abnormal R S T 2 Check power Line connection condition 3 Main PCB damage Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Is main PCB assembly normal No Yes Replace Main PCB assembl...

Page 107: ...oor unit capacity at LGMV No Yes Check following dip S W setting is on Slave1 No 5 7 Slave2 No 6 7 Slave3 No 5 6 7 No Adjust corresponding DIP switch Yes Is power of Slave PCB On Check LED blinking Yes No Are quantity and capacity of indoor units installed same as the data of LGMV Yes Adjust the capacity of indoor and outdoor unit No Check communication cables between indoor and outdoor units Is m...

Page 108: ...ation error between Inverter PCB Main PCB 52 Master 521 Slave 522 Error diagnosis and countermeasure flow chart Communication connector LED in MAIN PCB Communication connector LED in inverter compressor PCB Is communication LED Yellow of inverter compressor PCB on Yes No Is noise filter or fuse normal Replace noise filter or fuse No Replace inverter compressor PCB Is communication cable connected ...

Page 109: ...nits installed is not same as LGMV data and if communication of the indoor unit displayed at LGMV is done well then the indoor unit suspected to have some problem and is not appear at LGMV may have following problems wrong connection of communication cable or power cable fault of power PCB communication cable duplication of indoor unit number If communication is not doing well wholly then the Auto...

Page 110: ...erse direction miss ing a phase Wrong connection of 3Ø power supply cable Reverse direction missing a phase 54 Master 541 Slave 542 Error diagnosis and countermeasure flow chart Yes Is main PCB fuse normal No Replace Fuse Is CH 54 occurred again after reset MAIN circuit breaker No End Yes Is connection and phase order of power cables to main slave outdoor unit correct No Connect correctly Is conne...

Page 111: ... Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal No Yes Recheck power and installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is inverter PCB assembly normal No Yes Replace inverter PCB assembly Inverter EEPROM inserting point 3Ø 460V Inverter EEPROM inserting point 3Ø 208 230V Right inserting di...

Page 112: ...otor Assemble condition normal No Yes Recheck power and installation condition Check ODU Fan Motor assemble condition and fan locking Reassemble or replace if abnormality found Is ODU Fan Motor normal No Yes 1 Check resistance between each phase U V W of ODU fan motor terminal 16 8Ω 5 at 75 C 167 F 2 Check insulation resistance between ODU fan motor terminal U V W Replace fan motor if abnormality ...

Page 113: ...sor CT Sensor Error Error No Error Type Error Point Main Reasons Constant Speed Compressor CT Sensor Open short 1 Constant Speed Compressor CT Sensor defect Error Diagnosis and Countermeasure Flow Chart Is constant speed compressor CT Sensor connection condition normal No Yes Recheck power and installation condition Check constant speed compressor CT Sensor wiring condition and locking ...

Page 114: ...ge isn t within 2 5V 0 3V at initial state of power supply 1 Input voltage abnormal 2 ODU inverter PCB damage CT sensing part Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Is inverter PCB assembly normal No Yes Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if powe...

Page 115: ...or Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abn...

Page 116: ...purposes LGE Internal Use Only Measuring input voltage Noise filter wiring T S R Inverter PCB assembly power connection Noise filter power connection Inverter PCB assembly Wiring power to inverter PCB on Noise filter Compressor Wire Connection Noise filter input upper part Noise filter output lower part T S R ...

Page 117: ...eck power and installing condition Yes Is inverter PCB assembly power wiring normal Check abnormal wiring between Inverter PCB assembly bridge diode misconnection disconnection Rewiring if abnormal wiring found No Yes Is input voltage normal Check R S S T T R Phase voltage 460V 10 3Ø 460V 208 230V 10 3Ø 208 230V Check connection condition and wiring if power is abnormal No Yes Does indoor unit pow...

Page 118: ...No Error Type Error Point Main Reasons Offset of micom which senses the fan motor phase current is not 2 5V Fan CT sensor error 75 Master 751 Slave 752 Error Diagnosis and Countermeasure Flow Chart Yes Is Fan PCB assembly normal Recheck power and installation condition No Yes Is input voltage normal Check 15V wire connection Reassemble or manage if abnormality found No Checking 15V Replace Fan PCB...

Page 119: ... Fan DC Link High Voltage Error 76 Master 761 Slave 762 Error Diagnosis and Countermeasure Flow Chart No Check R S S T T R phase voltage 460 10 3Ø 460V 208 230 10 3Ø 208 230V Check connection condition and wiring if power is abnormal Is input voltage normal No Is Fan PCB assembly normal Recheck power and installation condition Yes Yes Measuring input voltage Replace Fan PCB assembly Noise filter w...

Page 120: ...ched with PCB s 2 Check wire disconnection and wiring Reassemble or replace if abnormality found Is Fan PCB assembly normal Yes No Recheck power and installation condition Yes No 1 Check resistance between each motor output terminal refer to page 63 2 Check insulation resistance between ODU fan motor terminal U V W and pipe over 100MΩ Replace fan motor if abnormality found No Are the resistance Be...

Page 121: ...ng Reassemble or replace if abnormality found Recheck f an motor hall sensor connection Reassemble if abnormality found Yes No Yes No Yes Is fan motor assemble condition normal Is wiring between fan motor and PCB normal Is connector color between Hall Sensor PCB matched No Check if connector color matched between fan motor hall sensor and PCB Reassemble if abnormality found Yes Is fan PCB assembly...

Page 122: ...and wiring Reassemble or replace if abnormality found Is fan PCB assembly normal Yes No Recheck power and installation condition Yes No 1 Check resistance between each motor output terminal 16 8 Ω 5 at 75 C 2 Check insulation resistance between ODU fan motor terminal U V W and pipe over 100MΩ Replace fan motor if abnormality found No Are the resistance Between each phase and insulation resistance ...

Page 123: ...PROM wrong insertion Error No Error Type Error Point Main Reasons EEPROM Access Error Main PCB EEPROM Error 86 Master 861 Slave 862 Error Diagnosis and Countermeasure Flow Chart Reset after checking EEPROM assemble condition Replace EEPROM with 24C16 Yes No Yes No Is EEPROM assemble condition normal Is EEPROM 24C16 Recheck power and installation condition ...

Page 124: ...hecksum as initializing after power is supplied Fan PCB EEPROM Error 87 Master 871 Slave 872 Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal 1 Check EEPROM insertion direction connection condition 2 Check EEPROM checksum Replace EEPROM if abnormality found Yes No Recheck power and installation condition Is Fan PCB assembly normal Yes No Fan EEPROM insertion Replace fan PCB...

Page 125: ...ster displays ODU number which is not communicated Slave displays own error number Transmission Error Between Outdoors 104 Master 11 041 Slave 12 042 Error Diagnosis and Countermeasure Flow Chart Is communication cable installed normally Connect communication cable Yes No Is Slave Unit Dip SW setting done Yes Dip SW setting No Slave Unit Dip SW Slave Is main PCB power supplied Yes Connect power ca...

Page 126: ... cable between Inverter PCB and fan PCB 2 Check communication cable between Inverter PCB and fan PCB Reconnect or replace wire if abnormality found Check communication cable between Inverter PCB and fan PCB Reconnect or replace wire if abnormality found Yes No Yes No Is fan PCB communication LED yellow blinking normally Is inverter PCB communication LED yellow blinking normally Yes Is fan PCB asse...

Page 127: ...e condition and locking Reassemble or replace if abnormality found 1 Check fan motor U V W connector connection condition Reassemble wire if abnormality found 2 Check fan motor wire disconnection Replace ODU fan motor if abnormality found Yes No Yes No Yes Is fan motor assemble condition normal Is fan motor wire connection condition normal Is fan PCB assemble condition normal No 1 Check fan PCB co...

Page 128: ...lied below 380V Fan DC Link Low Voltage Error 107 Master 11 071 Slave 12 072 Error Diagnosis and Countermeasure Flow Chart 1 Check DC_Link Wire connection 2 DC_Link Replace wire if abnormality found Measure DC_Link voltage Check inverter PCB if voltage is below 380V Yes No Yes No Is wiring between fan motor and PCB normal Is DC_Link voltage normal Yes Is Fan PCB assembly normal Recheck power and i...

Page 129: ...Main Reasons Abnormal sensor resistance value Open Short Outdoor unit sub cooling inlet outlet temperature sensor error 114 Master 11 141 Slave 12 142 Error diagnosis and countermeasure flow chart Is temperature sensor connector connections are normal Is the value of temperature sensor resistance normal Check and correct connection Replace sensor Replace outdoor unit PCB Yes Yes No No Sensor resis...

Page 130: ... Way valve connecter connection are properly connected No Reconnect it After reset can we check supply voltage at PCB when starting heating mode operation No Is 4 way valve coil connected to 4 way valve normally øπ No Is 4 Way valve coil resistance normal Change 4 Way valve coil No Yes In case of more than 2 units does master outdoor unit recognize as more than 2 units Refer to CH 51 make measure ...

Page 131: ... is supplied in order as follow Slave Mater ODU information is displayed one after the other at main PCB 7 segment 1 Model ID 2 Total Capacity Displayed with HP 3 ODU Type HEAT PUMP 2 Sync 3 4 Normal mode 25 5 Refrigerant 3Ø 208 230V 140 3Ø 460V 160 Checking method for outdoor unit of 3unit system Master Slave Close all the SVC valves of high low pressure common pipe Operate system Check the diffe...

Page 132: ...urrent Constant compressor defect 173 Master 11 731 Slave 12 732 Error diagnosis and countermeasure flow chart Is resistance value insulation phase to phase of corresponding constant compressor normal refer electric component part No Replaceconstant compressor Is discharge temperature sensor of compressor normal refer electric component part No Is cables connection of compressor normal Yes Adjust ...

Page 133: ...mperature sensor wire disconnection Measure temperature sensor resistance 10kΩ 5 at 77 F Replace the sensor if abnormality found Checking temperature sensor disconnection Fan heat sink connection Check connection condition 1 Heatsink temperature sensor defect 2 Fan PCB assembly defect 1 Heatsink temperature sensor defect Open Short 2 Wrong connection of temperature sen sor connector 3 Fan PCB asse...

Page 134: ...P NO MFL50459503 MAY 2008 ...

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