Reading Equipment Serial Numbers 1 0 4 KAT 1 2 3
Contents
1. 554160 2520UGJK2AA Comprssor 2520UGJK2AA Comprssor mm 552114 5211A22710C Wiesen 5241 22710 Ube ASSY Discharge Discharge 554160A 2520UGHK2AA Comprssor 2520UGHK2AA Comprssor 554160B 2520UGJK2AA Comprssor 2520UGJK2AA Comprssor 552114 5211 422710 1992 88 5211 22710 Hip SSY Discharge 554 160A TBZ30111701 TBZ30111701 5541608 25200GHKZ2AA Comprssor 2520UGHK2AA Comprssor 552114 AJR30834102 P SSY 4102 1992 ASSY Discharge Discharge 554160 TBZ30111701 TBZ30111701 4 5547608 2520UGHK2AA Comprssor 2520UGHK2AA Comprssor 552114 AJR30834101 1992 53Y AJR30834101 Ube 95 Discharge Discharge oymptom Reason 1 Symptom The unit s A or B Compressor is not working 2 Reason Compressor s terminal is damaged due to check valve s fault 3 Corrective Action When A or B Compressor is exchanged change all A B Compressors and discharge Pipe Refer to the attachment Alphabetic Code Numeral Code A Interchangeable Old and new parts can be used in products as the bulletin regardless of manufacturing date Old parts can be substituted for new parts Old parts can be used in previous products only but new parts can be used regardless of manufacturing date New parts can be substituted for old parts Only new parts can be used in products regardless of manufacture date D Not interchangeable New2. Check power supply voltage to the outdoor unit is correct 1ph 220 Vac 10 or 3ph 380 10 If OK check fuses if fuses OK replace outdoor main PCB Inverter compressor seized Check compressor windings all equal resistance 1 to 4 Ohms check to earth 50 MOhm minimum check run current and Inverter outputs Inverter current irregularity Check inverter PCB check reactor connections and its resistance is less than 1 ohm Inverter dc voltage too high Check dc voltage of capacitors 300 Vdc for 1Ph and 600 Vdc for 3Ph If OK change outdoor inverter PCB no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message Inverter compressor discharge temperature too high If over 105 C check refrigerant charge Excessive rise of standard compressor discharge temperature If over 105 C check refrigerant charge Excessive high pressure rise over 35 bar at HP sensor Check pressures check coils and filters are clean check for OFN in system pipework Excessive low pressure drop under 1 Bar at LP sensor Check pressures and check service valves open no such fault code Text 1 2 or digit fault code number only If you see fault cod
3. EN for example 6 red then 7 green is 67 POWER 1 digit Ss HESUHC Em PLASMA ESSERE 10 digit 10 20 30 etc PREHEATING I Libero mirror style indoor unit mE Heatin 10 digit 10 20 30 etc Plasma 10 digit 10 20 30 etc Ceiling cassette indoor unit 10 digit 10 20 30 etc 1 digit Beige amp mirror 13 10 amp 13 SEER indoor units SEER amp inverter indoor Page 1 OIO O Q C r v M 5 ERROR CODES UPDATED TO FEBRUARY 2012 Error code not used PCB sees IDU air thermistor as open or shorted Must be 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB PCB sees ODU discharge pipe thermistor as open or shorted Must be 244 000 at 20 C 68 F 24 400 at 90 C 194 F Ohm thermistorin water with perfect thermistor amp plug connection change PCB Condensate pump float switch risen open Check drain pan is empty check pump is working OK If no pump ensure blue jumper plugis inserted in IDU PCB plug CN_FLOAT If applicable ensure Dry Contact Interface is in OFF condition Check status and adjust as necessary With Central Controller if ALL system functions are locked HL will appearand is notan error code PTAC Freeze Protection mode indoor air thermistor shows PCB room temp less than 5 C 40 F If room is not this temp air thermistor 5 600 at 38 C 100 F amp 20
4. 2 17 42 80 465 214 43 241 44 2 08 45 2 05 46 2 02 47 2 48 86 402 197 49 1 94 50 1 91 51 89 374 188 52 90 366 186 53 1 83 54 18 55 1 77 56 mp xo m 57 95 326 172 58 96 318 g 59 1 67 60 98 30 18 61 99 297 162 62 1 6 63 101 157 64 102 1 55 65 1 52 68 104 15 67 105 148 68 145 69 143 70 108 141 71 1 39 72 1 36 73 134 74 1 32 75 1 3 76 1 28 77 45 1156 325 1 26 78 46 1124 322 124 79 122 80 3 16 12 81 906 214 3 13 1 18 82 5 1007 309 1 16 83 51 98 306 121 144 84 3 03 122 112 85 3 141 86 297 1 09 87 2 93 125 1 07 88 5 856 29 1 05 89 2 87 1 04 90 58 812 284 128 1 02 91 28 129 1 922 696 183 60 77 2n 0 99 68 18 274 0 97 94 271 0 95 95 2 67 0 94 96 64 694 264 0 92 97 2 61 0 91 98 606 167 66 659 258 0 89 99 2 54 0 88 100 88 626 251 0 87 69 611 248 0 85 lm icd 0 84 SERVICE BULLETIN Page US Contact 1 E mail amour24 lge com Air Conditioner Phone No of Issue Date of Issue Jul 16 2009 LG Electronics Inc Written by J B Park Buyer Model LMU240CE LMU240HE LMU360CE LMU360HE LGE Model A2UC243FA0 A2UH243FA0 ASUC363FA0 A3UH363FA0 Buyer Name North America Effective Date Jul 16 2009 Subject ODU A or B Compressor s Terminal part is broken No Location BEFORE CHANGE AFTER CHANGE Code model No 554160 SEIN 55500
5. Discharge Air Temperature Indoor Coil Delta T Indoor Coil Discharge Line Temperature Condenser Delta T Outdoor Coil Additional comments regarding operating conditions 2 of 4 Program Number US 0001016255 2013 AE COP CC 0111 5 LG Job Site Evaluation Report Corrective Action List Issues Discovered Photos Corrective Action Item s Suggested 3 of 4 Program Number US 0001016255 2013 AE COP CC 0111 45 LG Job Site Evaluation Report Comments and Observations Detailed Overview of Site Visit 4 of 4 Commercial Air Conditioning LC System Air Conditioning Technical Support 888 865 3026 follow prompt for Tech Support then Heating amp Air Conditioning Ductless Air Conditioner Error Codes NOTES 01 1 C1 and CHO1 are all the same code IDU Indoor Unit ODU Outdoor Unit PCB Printed Circuit Board Inverter units all have a V in the model number such as LSU121HSV or LAN186HV and use a 3 phase compressor Single phase unit feed is converted to 3 phase to power the compressor in the ODU PCB This list is based on inverter units as well as 10 amp 13 SEER unit error code exceptions will be noted Full thermistor information including proper checkout procedure is at the end of this document Inverter outdoor unit LEDs flash red then
6. 356 154 392 136 ze 123 111 5326 91 572 3 ez Ba 52 ea a aa 4 36 ah T ele eco Pie El Page 5 LG Air Thermistor Ohm Chart All air thermistors have black plastic tips whether for an indoor or outdoor unit Indoor air thermistors will be located on the right hand side of the indoor unit or in the return air flow Outdoor air thermistors will be located in open airon the rear of the outdoor unit coil Air thermistors have been labeled Ambient in previous documents I far e 6 s gt me An d co 25 4 o IS S a dlc h3 co e po e REH REH SHORT euo md Kie en 4 Page 6 LG Discharge Pipe Thermistor Ohm Chart Discharge thermistor will only be located in the discharge pipe immediately off the compressor Only discharge thermistors always have a white braided insulation a ons 40 10 806 LG System Air Conditioning Technical Support 888 865 3026 follow prompt for Tech Support then Heating amp Air Conditioning Page Keyword 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
7. IDU fan motor not rotating proving rotation Verify fan motor plugged in correctly amp fan rotates freely If fan is running at normal operational speed motorsensing circuit has failed replace motor LS902HPV LS122HPV LAO9xHV and LA12xHV if motor is not rotating verify 310V DC on motor wires that are separated by empty terminals on plug OV failed PCB 310V failed motor 10 amp 13 SEER if motor is not rotating verify 19 36V DC between DC common amp fan leg wire designation varies by 10 SEER 13 SEER single amp 13 SEER Flex Multi see appropriate service manual LS902HPV LS122HPV LAO9xHV LA12xHV ODU fan motor not rotating proving rotation verify plugged in properly if motor is not rotating verify 310V DC on motor wires that are separated by empty terminals on plug OV failed PCB 310V DC other Inverter units Vin model 8 Indoor unit EEPROM error failed EEPROM mismatched IDU ODU Inverter Flex Multi LMUxxxHV more than 13096 of IDUs in relation to ODU LS902HPV LS122HPV LAO9xHV and LA12xHV PCB sees ODU discharge pipe thermistor open shorted Must be 244 000 at 20 C 68 F amp 24 400 at 90 C 194 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Inverter IDU fan failure If motor is not rotating verify 310V DC on motor wires that are separated by empty terminals on plug OV DC failed PCB 310V DC failed motor 10 amp 13 SEER 36V DC IDUs IDU fan failur
8. tip record line length and refrigerant charge if added tip record model and serial number for future reference tip record installation date Fast Strong amp Gmart 10 8 9 LG TECH SUPPORT STEPS Distributor sends to the Contractor the Installation Check List and Procedures Contractor will Contact and Send Installation Check List to your Distributor s Contact for review LG System Questions should be asked by the Distributor s TSA If No Solution a Site visit maybe necessary with Distributor s TSA and LG Representative If No Solution call Tech Support 888 865 3026 Prompt 3 Review the Installation Check List and Problem Experienced with Tech Support and Trouble Shoot the LG System Ask if not given a CASE NUMBER The Case Number is necessary for assistance with the LG Representative Discuss with the Distributor the LG Technician s findings and the Distributor can assist you with the next step Replacement of Parts or a New Unit Approvals If Problem is not resolved immediately contact area LG Representative with the Case Number and a situation up to date Under no circumstance remove or replace unit without approval and documentation from LG Electronics Warranty claim credit will be denied 10 LGEAGI will give an RA for replacement if decided not repairable Program Number US 0001016255 2013 AE COP CC 0111 45 LG Field Evaluation Check Sheet General Installation Indoor Unit Model Number Ind
9. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Response Text the 1 2 or 3 digit fault code number only I e If you see fault code 7 on your indoor unit or R Controller only type 7 or 07 in your text message Indoor unit return air sensor fault Disconnect sensor from PCB and measure resistance 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor Indoor unit return air sensor fault Disconnect sensor from PCB and measure resistance 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor Indoor Pipe Sensor or Outdoor Sensor Assy fault Open or Short Disconnect from PCB and measure resistance Air sensor 10 kOhm at 25C Pipe sensor 5 kOhm at 25C If not replace sensor Indoor Pipe Sensor or Outdoor Sensor Assy fault Open or Short Disconnect from PCB and measure resistance Air sensor 10 kOhm at 25C Pipe sensor 5 kOhm at 25C If not replace sensor Remote controller comms error Check wired correctly if so check dipswitch in RC Set to Sg for 1 unit or Gr for group then reset power Remote controller comms error Check wired correctly if so check dipswitch in RC Set to Sg for 1 unit or Gr for group then reset power Product Heat Sink Sensor Error Open Short Cct or over 95C Commercial Product Condensate pump float switch risen Check drain pan is empty check pump is working OK If no pump check blue jumper plug is inserted in socket CN Float Product Hea
10. 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug Inverter PCB sees IDU air thermistor as open or shorted Must be 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 10 amp 13 SEER PCB sees IDU pipe OR air thermistor as open or shorted Pipe 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Air 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PTAC PCB sees IDU air thermistor as open or shorted Must be 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Inverter PCB sees IDU inlet pipe thermistor as open or shorted Must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 10 amp 13 SEER PCB sees IDU pipe thermistor OR air thermistor as open or shorted Pipe 5 000 at 25 77 F amp 10 000 at 10 C 50 F Air 10 000 at 25 C 77 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug PTAC PCB sees IDU pipe thermistor as open or shorted Pipe must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 10 amp 13 SEER Flex Multi units no
11. AC feeding unit Voltage feed must be 193 253V Inverter compressor seized or not proving rotation PCB converts single phase to 3 phase for compressor Verify 3 N 26 compressor windings are all equal at 1 4 verify 0 to ground verify equal voltage on compressor 3 phase legs Verify no refrigerant flow restrictions Inverter compressor amperage over 100A for a split second verify proper 208 240V feeding unit ensure unitis not 27 in high head situation verify 3 compressor windings are all equal at 1 4 verify 0 to ground check amperage check reactor connections and verify reactor resistance is less than 1 Inverter DClink voltage too low verify proper 208 240V AC feeding unit Voltage feed must be 193 253V AC Use appropriate N service manual to verify if PCB has failed Inverter compressor high amperage verify proper 208 240V AC feeding unit ensure unitis not operating in high head pressure condition verify 3 compressor windings are all equal at 1 4 verify O to ground check amperage 30 31 Error code not used Inverter compressor 105 C 220 F in discharge pipe Verify proper refrigerant charge amp ensure unitis not operating in high head temperature situation Generally will be refrigerant undercharge Thermistor 244 000 at 20 C 68 F 24 400 at 32 90 C 194 F Ohm thermistor in water ensure it plugs in properly LS302HPV LS305HV LS307HV have 1 inverter amp 1 single Si
12. LSU246HV LSU307HV LSU360HV LUU246HV LUUA26HV LANO90HSV LAN120HSV LAN180HSV LAN240HSV LSN246HV LSN307HV LSN360HV LFN246HV LFNA26HV LCN246HV LCN426HV SUPER HIGH EFFICIENCY INVERTER LSU091HSV LSU121HSV LSU181HSV LSU240HSV LSN091HSV LSN121HSV LSN181HSV LSN240HSV FLEX MULTI SYSTEMS HEAT PUMP OUTDOOR UNITS LMU187HV 18k LMU247HV 24k LMU369HV 34k INDOOR UNITS Standard LMN096HVT LMN126HVT LMN186HVT Art Cool LMANO095HVT LMAN125HVT LMAN185HVT Ducted LMDNO95HV LMDN125HV LMDN185HV Cassette LMCN125HV LMCN185HV LG MODEL NUMBERS 2010 TYPE CAPACITY DESIGN Art Cool Single 091 092 093 9 000 BTU S Single Zone 121 122 12 000 BTU H Pump M Multi Zone 182 18 000 BTU HV Inverter MA Art Cool Multi Zone 24 000 BTU HSV Inverter Super NP Picture replaceable MD Ducted Multi Zone 090 091 095 096 9 000 BTU INV High Efficiency single zone only MC Cassette Multi Zone 120 121 125 126 12 000 BTU INV Floor Standing 180 181 185 186 18 000 BTU INV HVT Thermostat Multi zone Standard Mirror Ceiling Cassette 240 241 245 246 24 000 BTU INV Compatible inverter Universal 365 366 36 000 BTU INV optional organic cream white 306 30 000 BTU INV art flower gold snow flower white SINGLE ZONE SYSTEMS SUPER HIGH EFFICIENCY STRAIGHT COOL HEAT PUMP INVERTER INVERTER OUTDOOR UNITS Standard Art Cool Standard Art Cool LSU092 3 CE LAU091CNP LSU092 3 HE LAUO91HNP LAU095 6
13. Multi units LM model 5 with no Vin model 4 Voltage on 1 amp 2 wires must float between 0 12VDC Generally steady OV DCis failed ODU PCB amp steady high voltage DCis failed IDU PCB All units Ensure ABSOLUTELY ZERO between wires wires to ground or wires to shield Electrically check all fuses at IDU Inverter Flex Multi LMUxxxHV Ensure IDU wires are not switched between IDUs amp 1B on one terminal 2A amp 2B on one terminal 3A alone 3B alone 3Calone 3D alone PTAC Mode error 15902 amp LS122HPV DC Peak Error verify proper 208V or 240V ACfeeding unit verify 3 compressor wires not switched verify compressor not seized verify 1 4 between all compressor terminals All other inverters PCB sees IDU outlet pipe thermistor as open or shorted Must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB PTAC Set point error Flex Multi Different mode operation indoor units must be set either all to heat or all to cool LS902HPV LS122HPV LAO9xHV LA12xHV Compressor Over Amperage verify proper 208V or 240V AC feeding unit ensure unit is not operating in high head situation verify 1 4 between all compressor terminals PTAC Thermistor error verify proper DIP switch settings If used verify wall mount thermostat properly wired for heat pump cool only With cool only unit GH B and O terminals are not used Page 2
14. angle Temporarily install indoor unit and check for fit and finish Make electrical connections prior to installing indoor unit tip use spade connectors on all terminals Route piping wire and drain line through access hole and proceed outdoors if on an exterior wall tip use insulated drain material to avoid condensation issues Fast Strong amp Gmart 5 Site Preparation Outdoor Unit Locate Outdoor Unit to provide optimum service access and clearances a Avoid doors windows heat generating sources b Maintain recommended clearances and avoid discharge air obstructions c Install unit on properly leveled precast concrete pad and anchor accordingly d Mount line set cover with approved fasteners tip 6 covers provide adequate room for piping wiring and drain Pre Form line set to match route planned tip make sure not to kink the copper while forming bends tip measure line set and record length inside outdoor unit Connect flares at both ends of tubing tip use a small amount of oil on back sides of flares Fast Strong amp Gmart 6 Site Preparation Outdoor Unit Tighten Flares tip always use 2 wrenches when tightening flare connections tip torque wrenches provide the optimum setting for flare connections Connect indoor wiring to outdoor unit making sure to follow same color code as indoor connections tip use spade connectors on all terminals tip 14 4 stranded cable is
15. cure the fault Communication error between Main and Sub outdoor units Check comms wiring and power to all outdoor units Main outdoor unit liquid pipe sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Main outdoor unit Subcool inlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Main outdoor unit Subcool outlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 1 high pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 Vdc 8 bar up to 2 5 37 bar Sub 1 low pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 Vdc 4 bar up to 5 Vdc 32 bar Sub 1 outdoor unit air sensor fault Disconnect from PCB and measure resistance 8 kOhm at 30 C and 13 kOhm at 20 C If OK replace PCB if not replace sensor Sub 1 outdoor unit suction sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C if not replace sensor Sub 1 compressor 1 discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C and 168 kOhm at 30 C if not replace sensor Sub 1 compressor 2 discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C and 168 kOhm at 30 C if not replace sensor Sub 1 outdoor unit coil sensor A fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOh
16. fin temperature sensor fault Disconnect from PCB measure resistance 8 kOhm at 30 C and 13 kOhm at 20 C Outdoor Fan Motor siezed or rotation sensing circuit failure Check motor for mechanical and or electrical failure if okay replace pcb Excessive discharge temperature rise 105 C Sub condenser 1 standard compressor Check refrigerant Excessive discharge temperature rise 105 C Sub condenser 1 standard compressor Check refrigerant Excessive discharge temperature rise 105 C Sub condenser 2 standard compressor Check refrigerant Excessive discharge temperature rise 105 C Sub condenser 2 standard compressor Check refrigerant Communication error between Main and Sub outdoor units Check comms wiring and power to all outdoor units Communication error between outdoor main PCB and fan PCB Check plug connections and LEDs If OK replace either main or fan PCB Outdoor unit fan motor high current Check fans rotate freely and are connected correctly Outdoor unit low voltage to fan PCB Check 300 Vdc supply check fuses and plug connections If OK replace fan PCB Communication error between outdoor main PCB and fan PCB Check plug connections and LEDs If OK replace either main or fan PCB Sub 1 excessive rise of high pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 1 reverse or open phase Check all 3 phases are present and correct If correct voltage appears at all three phases swap any two to
17. parts can be used in new products only To improve performance To improve productivity To improve reliability Change of material or dimension Addition Deletion Correction To improve delivery 2 e D Y ES D Ou S lt WORK FLOW LMU240CE A2UC243FA0 Tube Assembly Discharge P No 5211A22710C Welding Point A Compressor s di P No 25200 2 B Compressor s discharge P No 2520UGJK2AA LMU240HE A2UH243FA0 Tube Assembly Discharge P No 5211 22710 Welding Point Tube Assembly Reverse P No 5211A11010A A Compressor s c P No 2520UGHK B Compressor s discharge P No 2520UGJK2AA WORK FLOW LMU360CE A3UC363FA0 Tube Assembly Discharge P No AJR30834102 Welding Point Tube Assembly Gondenser In PINo 5211A16042A 9 Ki B Compressor s discharge A Compressor s discharge P No 2520UGHK2AA P No TBZ30111701 LMU360HE A3UH363FA0 Tube Assembly Discharge P No AJR30834101 ZN Welding Point Tube Assemk P No 5211A A Compressor s discha P No TBZ30111701 B Compressor s discharge P No 2520UGHK2AA
18. required on all high voltage combinations tip Shielded cable is suggested for all installations in server rooms Connect high voltage power from dedicated circuit tip make sure to wire L1 and L2 to correct polarity for all 115 volt systems tip make sure to verify a solid ground connection e Verify all piping and electrical connections before proceeding tip make sure no strands are loose and touching adjacent terminals e Prepare unit for leak check process tip pull tubing insulation from flares and apply small amount of leak bubbles prior to adding Nitrogen Fast Strong amp Gmart Start Up Preparation Outdoor Unit Add Nitrogen to 550 psi tip listen and look for leaks flare connections tip hold 600 psi until confident no leaks are present Connect vacuum pump and micron gauge to service valve tip never use unitary gauge sets to avoid cross contamination tip always use clean vacuum pump oil tip make sure to pull at least a 500 micron vacuum on first attempt e Continue evacuation process until confident no leaks or non condensable are present tip triple evacuation process is a good practice tip dirty vacuum pump oil prohibits a good evacuation e Secure tubing insulation and wiring in line set cover and install top cover tip make sure to properly insulate all joints and tape to prevent condensation forming Prepare unit for start up process tip good time to make sure all pr
19. sensor 10 kOhm at 25C Pipe sensor 5 kOhm at 25C If not replace sensor Remote controller comms error Check wired correctly if so check dipswitch in RC Set to Sg for 1 unit or Gr for group then reset power Product Heat Sink Sensor Error Open Short Cct or over 95C Commercial Product Condensate pump float switch risen Check drain pan is empty check pump is working OK If no pump check blue jumper plug is inserted in socket CN Float Comms Error check your wiring remove external pumps Split Multi check volts from terminal N to 3 0 65 Vdc Multi V 4 terminals 3 and 4 Indoor unit coil sensor fault Disconnect from PCB measure resistance 10 kOhm at 10C and 4 kOhm at 30C if not replace sensor Split text 21 Multi Splits and Multi V indoor unit is set to run in a different mode from the master indoor unit Set ALL indoor units to cooling or ALL to heating to clear Splits Compressor Over Current CT2 also see Code 06 RAC Indoor unit BLDC Fan problem This is caused by the Indoor fan being locked Check fan motor is plugged in correctly Electrically amp Mechanically sound Check the fan motor turns freely check the AC Voltage supplied to the fan motor this will vary from 120 V ac at low speed to 170V AC at high speed If no Voltage is present the the PCB is faulty if Voltage is present the fan motor will be Faulty Split 2 Outdoor unit fan problem Check Outdoor fan motor is plugged in Electrically am
20. two to cure the fault no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message Comms error between outdoor main PCB and inverter PCB Check wiring fuses and LEDs are lit If OK either inverter or main PCB defective no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message Outdoor unit PCB EEPROM failure try removing EEPROM and refitting if removable possible contact fault otherwise replace PCB if the EEPROM is non removable Condenser coil over 65 C Check coil and filters are clean and free from debris and airflow is OK Check system pressures for non condesables Inverter over 85 C Check air flow across heat sink check inverter tight to heatsink use thermal paste Multi V check inverter cooling fan Multi F DX Cond Pipe Sensor Temp Low opposite to Error Code 61 Check Temperature Resistance reading and replace sensor if found to be faulty If sensor okay check for cause of low temperature and rectify no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message Outdoor unit inverter
21. unit coil sensor A fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If OK replace PCB if not replace sensor Sub 2 outdoor unit coil sensor B fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If OK replace PCB if not replace sensor Sub 2 outdoor unit liquid pipe sensor fault Disconnect from PCB and measure resistance 10 kOhm at 109C and 4 kOhm at 309C Sub 2 outdoor unit Subcool inlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 2 outdoor unit Subcool outlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 2 excessive rise of high pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 2 reverse or open phase Check all 3 phases are present and correct If correct voltage appears at all three phases swap any two to cure the fault Communication error between Main and Sub outdoor units Check comms wiring and power to all outdoor units Sub 1 excessive rise of high pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 1 excessive drop of low pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 2 excessive rise of high pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 2 excessive d
22. HV LSU090 1 HSV LSU122CE LAU121CNP LSU122HE LAU121HNP LAU125 6 HV LSU120 1 HSV LSU182 6 CE LSU182 6 HE LAU095 6 HNP LAU185 6 HV LSU180 1 HSV LSU242 6 CE LSU242 6 HE LAU245 6 HV LSU240 1 HSV LSU306HV INDOOR UNITS Standard Art Cool Standard Art Cool LSN092 3 CE LAN091CNP LSN092 3 HE LANO91HNP LAN095 6 HV LSN090 1 HSV LSN122CE LAN121CNP LSN122HE LAN121HNP LAN125 6 HV LSN120 1 HSV LSN182 6 CE LSN182 6 HE LANO95 6 HNP LAN185 6 HV LSN180 1 HSV LSN242 6 CE LSN242 6 HE LAN245 6 HV LSN240 1 HSV LSN306HV FLEX MULTI SYSTEMS STRAIGHT COOL HEAT PUMP OUTDOOR UNITS LMU185 6 HV 18k LMU245 6 HV 24k LMU365 6 HV 36k INDOOR UNITS Standard Art Cool Ducted Cassette LMN095HVT LMANO095HVT LMDNO95HV LMCN125HV LMN125HVT LMAN125HVT LMDN125HV LMCN185HV LMN185HVT LMAN185HVT LMDN185HV 2010 REVISED PART NUMBERS SHOWN IN DFS Installation Terry Frisenda Regional Sales LG Electronics Southeast U S www lIg dfs com Fast Strong amp Smart 1 Product Selection DFS Installation e Verify or Run a Load Calculation Verify available voltage Verify dedicated circuit available Verify matched systems components Verify piping run will be within specifications Verify indoor and outdoor locations Read Installation Manual prior to beginning installation Dont sell a system beyond its capabilities Fast Strong amp Gmart 2 Tools Needed DFS Installation Absolutely Needed Should Have e R410a flarin
23. K replace PCB if not replace sensor Sub 3 outdoor unit liquid pipe sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 3 outdoor unit Subcool inlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 3 outdoor unit Subcool outlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 109C and 4 kOhm at 309C Sub 3 excessive rise of high pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 3 excessive drop of low pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub check power supply voltage to the outdoor unit is correct 1ph 220 Vac 10 or 3ph 380 10 check fuses if fuses OK replace outdoor main Sub check power supply voltage to the outdoor unit is correct 1ph 220 Vac 10 or 3ph 380 10 check fuses if fuses OK replace outdoor main PCB Main outdoor unit standard compressor not starting Check output from main PCB check contactor and check wiring connections If OK compressor faulty Sub 1 standard compressor 1 not starting Check output from main PCB check contactor and check wiring connections If OK compressor faulty Sub 1 standard compressor 2 not starting Check output from main PCB check contactor and check wiring connections If OK compressor faulty Sub 2 standard compressor 1 not starting Check outpu
24. PROM failure Replace PCB if the EEPROM is non removable PCB sees Condenser coil over 65 C 149 F Code is sensed at ODU in cool mode and IDU in heat mode Verify coil filters amp blower wheel are clean and airflow OK Check system pressures for non condensibles Verify system is not running in high 61 condensor coil temperature condition Verify ALL thermistors on condensor coil IDU ODU depending on mode are accurate be caused by discrepancy among thermistors on same coil ODU coils 1 2 thermistors IDU coils 1 3 thermistors Must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug Inverter ODU PCB heat sink 85 C 185 F Verify airflow across heatsink verify PCB tight to heatsink use thermal paste Thermistor 10 000 at 25 C 77 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug Condensor Coil Pipe Sensor Temp Low opposite to Error Code 61 Code is sensed at ODU in cool mode amp IDU in heat 63 mode Verify system is notrunning in low condensor coil temperature condition Verify ALL thermistors on condensor coil IDU ODU depending on mode are accurate can be caused by discrepancy among thermistors on same coil ODU coils 1 2 thermistors IDU coils 1 3 thermistors 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with 64 Error code not used 65 outdoor unit inverter fin tempe
25. Reading Equipment Serial Numbers The month and that equipment was manufactured can determined by the following 104 KAT 12 3 4 __ YEAR MONTH 2011 204 KAT 12 3 4 YEAR MONTH 2012 LG Model Numbers 2012 UNIT ID CAPACITY DESIGN A Art Cool Single S Single Zone M Multi Zone MA Art Coo Multi Zone MD Ducted Multi Zone MC Cassette Multi Zone U Outdoor C Ceiling Cassette U Universal 093 096 9 000 BTU 122 126 12 000 BTU 186 18 000 BTU 240 24 000 BTU 090 091 095 096 9 000 BTU INV 120 121 125 126 12 000 BTU INV 180 181 185 186 187 18 000 BTU INVIHVT Thermostat 240 246 247 24 000 BTU INV 307 30 000 BTU INV 360 369 36 000 BTU INV 426 42 000 BTU INV E Standard H Heat Pump HV Inverter HSV Inverter Super High Efficiency Art Cool Options NP Picture replaceable single zone only Multi zone Standard Mirror Optional organic cream white art flower gold snow flower white Compatible Inverter SINGLE ZONE SYSTEMS SUPER HIGH EFFICIENCY INVERTER SUPER HIGH EFFICIENCY HEAT PUMP INVERTER INVERTER OUTDOOR UNITS HEAT PUMP INVERTER INDOOR UNITS Standard Standard LSUO93HE LSU122HE LSU186HE Art Cool LAUO96HNP LAU126HNP LAUO90HSV LAU120HSV LAU180HSV LAU240HSV LSU246HV LSU307HV LSU360HV LUU246HV LUUA26HV LSU091HSV LSU121HSV LSU181HSV LSU240HSV LSN093HE LSN122HE LSN186HE Art Cool LAN091HNP LAN121HNP LANO
26. SOHNP LANO9OHSV LAN120HSV LAN180HSV LAN240HSV LSN246HV LSN307HV LSN360HV LCN246HV LCN426HV LSN091HSV LSN121HSV LSN181HSV LSN240HSV FLEX MULTI SYSTEMS HEAT PUMP OUTDOOR UNITS Standard INDOOR UNITS Art Cool Ducted Cassette LMNO96HVT LMANO95HVT LMDN095HV LMCN125HV LMN126HVT LMAN125HVT LMDN125HV LMCN185HV LMN186HVT LMAN185HVT LMDN185HV LMU187HV 18k LMU247HV 24k LMU369HV 34k LG MODEL NUMBERS 2011 TYPE A Art Cool Single Zone S Single Zone M Multi Zone MA Multi Zone Art Cool MD Moulti Zone Ducted MC Multi Zone Cassette F Floor Standing C Ceiling Cassette U Universal STRAIGHT COOL Standard LSUO93CE LSU122CE LSU186CE Standard CAPACITY 9 000 BTU 12 000 BTU 18 000 BTU 090 091 095 096 9 000 BTU INV 120 121 125 126 12 000 BTU INV DUTY C Cool H Heat Pump HV Inverter HSV Inverter Super High Efficiency HVT Thermostat DESIGN E Standard Art Cool Options NP Picture replaceable single zone only 180 181 185 186 187 18 000 BTU INV 24 000 BTU INV 30 000 BTU INV 34 000 BTU INV 36 000 BTU INV 42 000 BTU INV SINGLE ZONE SYSTEMS HEAT PUMP OUTDOOR UNITS Standard LSUO93HE LSU122HE LSU186HE Art Cool LAUO96HNP LAU126HNP INDOOR UNITS Standard Art Cool LSN093CE LSN122CE LSN186CE LSNO93HE LSN122HE LSN186HE LAN091HNP LAN121HNP LANO90HNP Compatible Inverter INVERTER LAUO90HSV LAU120HSV LAU180HSV LAU240HSV
27. V 4 Vdc terminals 3 and 4 Inverter compressor run current high Check compressor windings all equal 1 to 4 Ohms Check to earth 50 MOhm minimum check run current Splits Compressor Over Current CT2 also see Code 06 RAC Indoor unit BLDC Fan problem This is caused by the Indoor fan being locked Check fan motor is plugged in correctly Electrically amp Mechanically sound Check the fan motor turns freely check the AC Voltage supplied to the fan motor this will vary from 120 V ac at low speed to 170V AC at high speed If no Voltage is present the the PCB is faulty if Voltage is present the fan motor will be Faulty Outdoor unit fan problem Check Outdoor fan motor is plugged in Electrically amp Mechanically sound if not replace motor otherwise replace PCB Compressor discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C 168 kOhm at 30C Product EEPROM Sum Check Error text 60 for help Product PSC Reactor Error text 27 for help Product Compressor Phase Current Error Text the 1 2 or 3 digit fault code number only I e If you see fault code 7 on your indoor unit or R Controller only type 7 or 07 in your text message Indoor unit return air sensor fault Disconnect sensor from PCB and measure resistance 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor Indoor Pipe Sensor or Outdoor Sensor Assy fault Open or Short Disconnect from PCB and measure resistance Air
28. Vin model number Different mode operation IDUs must be setall to heat orall to cool Inverter units with Vin model Communication error between IDU amp hard wired controller Ensure only LG factory wire is used amp properly plug connection from IDU PCB wire stub wire controller PTAC PCB sees outdoor air thermistor as open or shorted Must be 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB LAxxxHV amp LSxxxHPV ODU PCB Heat Sink thermistor open shorted or over heated to 95 C Must be 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Models beginning with AR or LMDNxxxHV IDU Condensate pump float switch risen opened Check drain pan is empty amp pump working If no pump ensure blue jumper plug inserted in IDU PCB plug CN FLOAT PTAC PCB sees outdoor air thermistor as open orshorted Pipe must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Communication Error check wiring 123 or 1234 at ODU MUST BE SAME COLOR as 123 or 1234 on IDU remove condensate Inverters Voltage on wires 2 amp 3 mustfloat between approximately 0 65V DC 10 amp 13 SEER single IDU single ODU no Vin model H Voltage on 3 amp 4 wires mustfloat between 0 12 DC 10 amp 13 SEER Flex
29. and black cable on plug Multi V 1 Vdc 8 bar up to 2 5 37 bar Sub low pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 Vdc 4 bar up to 5 32 bar 159 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 204 208 212 240 241 242 243 244 245 246 250 251 252 253 Ci 2 4 5 6 7 C8 C9 CA CC Cd CE CHOO CHO1 2 CHO3 CHO4 CHO5 CHO6 CHO7 CHO8 CHO9 CH10 CH11 CH12 CH13 CH14 CH15 CH16 Sub 3 outdoor unit air sensor fault Disconnect from PCB and measure resistance 8 kOhm at 30 C and 13 kOhm at 20 C If OK replace PCB if not replace sensor Sub 3 outdoor unit suction sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C if not replace sensor Sub 3 compressor 1 discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C and 168 kOhm at 30 C if not replace sensor Sub 3 compressor 2 discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C and 168 kOhm at 30 C if not replace sensor Sub 3 outdoor unit coil sensor A fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If OK replace PCB if not replace sensor Sub 3 outdoor unit coil sensor B fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If O
30. been carried out correctly Product EEPROM Sum Check Error text 60 for help Product PSC Reactor Error text 27 for help Product Compressor Phase Current Error no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message Inverter compressor run current high Check compressor windings all equal 1 to 4 Ohms Check to earth 50 MOhm minimum check run current Inverter compressor run current high Check compressor windings all equal 1 to 4 Ohms Check to earth 50 MOhm minimum check run current Inverter dc voltage low Check dc voltage of capacitors 300 Vdc for 1Ph and 600 Vdc for 3Ph If OK change outdoor inverter PCB Splits and Multi Splits High or low pressure trip Low at 1 bar High at 35 bar check pressures Multi V High pressure trip
31. e 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message Inverter ac current abnormal Check compressor windings all equal resistance 1 to 4 Ohms check to earth 50 MOhm minimum check run current and inverter outputs Inverter compressor discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 and 168 kOhm at 30 C Low pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 Vdc 4 bar up to 5 Vdc 32 bar High pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 8 bar up to 2 5 37 bar Outdoor unit air sensor fault Disconnect from PCB and measure resistance 8 kOhm at 30C and 13 kOhm at 20C If OK replace PCB if not replace sensor Outdoor unit coil sensor fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If OK replace PCB if not replace sensor Outdoor unit suction sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If OK replace PCB if not replace sensor Compressor discharge sensor fault Disconnect
32. e if motor is not rotating verify 19 36V DC between DC common amp fan leg wire designation varies by 10 SEER 13 SEER single amp 13 SEER Flex Multi see appropriate service manual 11 Multi V Commercial Product only not used in DFS PCB sees IDU middle pipe thermistor as open or shorted Must be 2 800 at 38 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 3 Reactor or electronic noise filterfailure Copper coil around magnetin ODU replace this item Same error code as Cd 4 Compressor Phase Amperage Error 15 16 17 18 19 20 Error code not used Inverter compressor high amperage verify proper 208 240V AC feeding unit ensure unitis not operating in high head situation verify 3 compressor windings are all equal at 1 4 verify O to ground check amperage Inverter unit high amperage verify proper 208 240V AC feeding unit ensure unitis notoperating in high head situation verify 3 compressor windings are all equal at 1 4 verify O to ground check amperage 3 Inverter DClink voltage too low verify proper 208 240V AC feeding unit must be 193 253V AC Use service manual to verify if High or low pressure switch open Low pressure opens at 14 PSI high pressure at 600 PSI Flex Multi ensure indoor unit wiring is notswitched sending refrigerant to wrong coil with no IDU fan 5 Low voltage or high voltage feeding unit verify proper 208 240V
33. ermistor as open or shorted Must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Page 3 PCB sees ODU single speed compressor discharge pipe thermistor as open or shorted Must be 244 000 at 20 C 68 F 24 400 at 90 C 194 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB PCB sees ODU coil outlet liquid line thermistor as open or shorted 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 13 SEER Split Multi Split Outdoor unit discharge and air sensor both unplugged Verify AC voltage to ODU is 193 253V AC If OK check fuses if fuses OK replace outdoor main PCB 50 Error code not used Unit mismatch Check model number of units do not exceed maximum Flex Multi cannot exceed 130 ODU communication error between inverter PCB and main outdoor unit PCB Check wiring amp fuses verify LEDs on both PCBs are lit If OK eitherinverter or main PCB defective Communication error Ensure that 3 communication wire is properly plugged into ODU PCB See error code 5 55 56 Error code not used LA 3 phase wiring issue Communication error between outdoor main PCB and inverter PCB Check wiring amp fuses verify LEDs on both PCBs are lit If OK eitherinverter or main PCB defective 58 59 Error code not used EE
34. from PCB measure resistance 237 kOhm at 20 C and 168 kOhm at 30 C If OK replace PCB if not replace sensor Split Multi Split 2 Outdoor unit discharge and air sensor both unplugged Multi V Outdoor unit coil sensor Text 45 for diagnostics Check power supply voltage to the outdoor unit is correct ph 220 Vac 10 or 3ph 380 10 If OK check fuses if fuses OK replace outdoor main PCB no such fault code Text 1 2 or digit fault code number only If you see fault code 7 only type 7 in your text message Unit mismatch Check model number of units do not exceed maximum Multi V also check Sub outdoor unit dipswitch settings Communication error between inverter PCB and main outdoor unit PCB Check wiring fuses and LEDs If OK either inverter or main PCB defective 53 54 55 56 57 58 59 60 61 62 63 64 65 67 100 101 102 103 104 105 106 107 108 109 110 111 113 114 115 116 117 118 120 121 122 123 124 125 126 127 128 129 130 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 Comms error indoor to outdoor unit Check your wiring Split and Multi check voltage from terminal N to 3 0 65 Vdc Multi V 4 terminals 3 and 4 Reverse or open phase Check all 3 phases are present and correct If correct voltage appears at all three phases swap any
35. g tool e R410a hose adaptor e Vacuum Pump Spring Benders Diamond Core bit Torque wrenches Clean vacuum pump oil Dedicated LG gauge set e GMV Software e Inverter Checker Electronic scale 600 psi nitrogen regulator 2 3 4 hole saw 4mm allen wrench ED Thermometer e 2adjustable wrenches Suction gauge hose set e Micron Gauge Fast Gong amp Smart 3 Supplies Needed DFS Installation Absolutely Needed Should Use e Individually insulated line sets 6 line set covers e 14 4 Stranded Wire 300 volt e Pre Made Line sets outdoor rated 600 Volt outdoor 14 4 stranded e Hollow Wall Fasteners shielded wire Concrete Fasteners Spade Connectors e Electrical Whip Disconnect e Flexible insulated anti microbial conduit fittings drain line material e Expanding foam for wall Correct Condensate Pump for penetration application if needed e Drain line material Fast Strong amp Gmart Site Preparation Indoor Unit Locate Indoor unit to provide optimum cooling coverage a Avoid doors windows heat generating sources b Maintain recommended clearances heights and distance from ceilings c Determine wall material and fastening methods for such d Mount wall bracket with selected fasteners tip install two strips of foam tape on back of plate Determine pipe route from back of unit and drill hole accordingly tip make sure to drill hole at slightly downward
36. m at 30 C If OK replace PCB if not replace sensor Sub 1 outdoor unit coil sensor B fault Disconnect from PCB measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C If OK replace PCB if not replace sensor Sub 1 outdoor unit liquid pipe sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 1 outdoor unit Subcool inlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 1 outdoor unit Subcool outlet sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C Sub 2 high pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 8 bar up to 2 5 37 bar Sub 2 low pressure sensor fault Check dc voltage between white and black cable on plug Multi V 1 Vdc 4 bar up to 5 Vdc 32 bar Sub 2 outdoor unit air sensor fault Disconnect from PCB and measure resistance 8 kOhm at 30 C and 13 kOhm at 20 C If OK replace PCB if not replace sensor Sub 2 outdoor unit suction sensor fault Disconnect from PCB and measure resistance 10 kOhm at 10 C and 4 kOhm at 30 C if not replace sensor Sub 2 compressor 1 discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C and 168kOhm at 30 C if not replace sensor Sub 2 compressor 2 discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C and 168kOhm at 30 C if not replace sensor Sub 2 outdoor
37. ngle speed compressor 105 C 220 F in discharge pipe Verify proper refrigerant charge amp ensure unitis not operating 33 high head temperature situation Generally will be refrigerant undercharge Thermistor 244 000 at 20 C 68 F 24 400 at 90 C 194 F Ohm thermistor in water ensure it plugs in properly LS302HPV LS305HV LS307HV have 1 inverter amp 1 single 4 High pressure switch opened over 600 PSI 35 Low pressure switch opened under 14 PSI LA 36 37 38 39 Error code not used Inverter PCB amperage sensing circuit failure Use appropriate service manual to test PCB I PCB sees inverter compressor discharge pipe thermistor as open or shorted Thermistor must be 244 000 at 20 C 68 F 24 400 at 90 C 194 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Low pressure switch opened under 14 PSI High pressure switch opened over 600 PSI PCB sees ODU airsensor as open or shorted Must be 5 600 at 38 C 100 F amp 20 700 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB WIN PCB sees ODU condensor coil middle if unit has middle sensor or exit pipe liquid line thermistor as open or shorted gt AIA gt N N N N ejej m N P N Must be 2 800 at 38 C 100 F amp 10 000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection PCB sees ODU suction line th
38. o the fan motor this will vary from 120 V ac at low speed to 170V AC at high speed If no Voltage is present the the PCB is faulty if Voltage is present the fan motor will be Faulty RAC Indoor unit BLDC Fan problem This is caused by the Indoor fan being locked Check fan motor is plugged in correctly Electrically amp Mechanically sound Check the fan motor turns freely check the AC Voltage supplied to the fan motor this will vary from 120 V ac at low speed to 170V AC at high speed If no Voltage is present the the PCB is faulty if Voltage is present the fan motor will be Faulty Split 2 Outdoor unit fan problem Check Outdoor fan motor is plugged in Electrically amp Mechanically sound if not replace motor otherwise replace PCB Multi V Indoor unit EEPROM error Replace the indoor unit PCB and then make sure to do Auto addressing and input the address of central control Split 2 Outdoor unit fan problem Check Outdoor fan motor is plugged in Electrically amp Mechanically sound if not replace motor otherwise replace PCB Multi V Indoor unit EEPROM error Replace the indoor unit PCB and then make sure to do Auto addressing and input the address of central control Product Compressor discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C 168 kOhm at 30C Multi Fdx amp Multi V text 8 Multi V indoor unit not connected to an outdoor unit Check comms wiring is correct and check initialisation has
39. ocedures and checks were completed Fast Strong amp Gmart 8 Start Up Preparation Outdoor Unit Open service valves tip a 4mm allen wrench is required tip allow refrigerant to enter system before power is applied Verify refrigerant charge based on line set length tip never install less than 16 of line set tip when exceeding 25 buy correct line set to avoid connections tip if adding charge an electronic scale must be used tip never use unitary gauges on LG Systems Start Up system tip always start system in cooling mode tip if adding refrigerant start system and add slowly to avoid flashing Verify Cooling and fan operations tip set remote to user friendly settings Verify Heating and fan operations tip If outside temperature is over 75 heat function will not operate Fast Strong amp Gmart Start Up Verification Verify operation in all modes possible Verify system is removing condensation to outside or drain termination Go over Remote Control operation with Homeowner tip explain remote does not reflect room temp unless selected tip explain indoor units run 24 7 and sense air temps across coil tip explain plasma filter if included tip explain error code locations e Discuss needs for maintenance tip condensation management is number 1 service issue tip suggest bi annual maintenance to prolong life cycle Record installation Specifics
40. oller data sending time out Either defective CNU or Central controller initialisation failure Central controller data receiving time out Either defective CNU or Central controller initialisation failure Central controller data receiving error Either comms cable picking up external electrical noise or defective CNU Central controller receiving no data Either comms cable picking up external electrical noise or defective CNU Central controller incorrect address error Check addresses match if OK either comms cable picking up external electrical noise or defective CNU Central Controller Disconnection Error No response from Air Conditioner Check wiring if OK either comms cable picking up external electrical noise defective CNU or Interface Indoor unit return air sensor fault Open or Short Disconnect sensor from PCB and measure resistance 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor Indoor Pipe Sensor or Outdoor Sensor Assy fault Open or Short Disconnect from PCB and measure resistance Air sensor 10 kOhm at 25C Pipe sensor 5 kOhm at 25C If not replace sensor Product Heat Sink Sensor Error Open Short Cct or over 95C Commercial Product Condensate pump float switch risen Check drain pan is empty check pump is working OK If no pump check blue jumper plug is inserted in socket CN Float Comms Error check your wiring remove external pumps Split Multi check volts from terminal N to 3 0 65 Multi
41. oor Unit Serial Number OUTDOOR AMBIENT TEMP oF INDOOR AMBIENT TEMP oF SET TEMP F Lineset Length Feet Position of indoor unit Include distance from floor ceiling and side walls Gas side 3 way valve Liquid side 2 way valve Outdoor Unit Model Number Outdoor Unit Serial Number Program Number US 0001016255 2013 AE COP CC 0111 LG Job Site Evaluation Report Installation Date Project Name and Address Installation Service Contractor System Model No Indoor Outdoor Model No Indoor Outdoor Serial No Line Voltage Supply Site Visit Conducted By Interconnecting Wiring Size Condensation Pump Model No Interconnecting Wiring Length IET COME CONS WIND Details of System Orientation and Line Set Interconnecting Wiring Grounded Refrigerant Charge Additional comments regarding system installation line set and piping traps 1 of 4 Program Number US 0001016255 2013 AE COP CC 0111 LG Job Site Evaluation Report List All Replacement Parts Components on System Ambient Outdoor Temperature DB Ambient Indoor Temperatures WB DB Suction Pressure PSIG Suction Line Temperature System Superheat
42. p Mechanically sound if not replace motor otherwise replace PCB Multi V indoor PCB failure Replace PCB Product Compressor discharge sensor fault Disconnect from PCB measure resistance 237 kOhm at 20 C 168 kOhm at 30C Multi Fdx amp Multi V text 8 Multi V indoor unit not connected to an outdoor unit Check comms wiring is correct and check initialisation has been carried out correctly no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or 3 digit fault code number only If you see fault code 7 only type 7 in your text message no such fault code Text 1 2 or digit fault code number only If you see fault code CHO7 only type 7 in your text message T FH Vi VDC OUT AE TINE TEMP AE A gt THERMISTOR RF MP KQ VDC OUT TE 3 4 VDC OUT VDC OUT 2 4574 44 2 45 33 2 42 34 gt see 28 35 2 36 36 2 32 37 2 29 38 e aa e 2 26 39 SF amp 40 e 22 41 9 3402 423
43. rature sensor fault Disconnect from PCB measure resistance Must be 10 000 at 25 C 77 F 66 Error code not used ODU Fan Motor seized orrotation sensing circuitfailure Check motor for mechanical and or electrical failure Check fuse 67 in motor cable if unit has one If motor is not rotating verify 310V DC on motor wires that are separated by empty terminals on plug OV DC failed 310V failed motor nverter compressor drawing over 48 amps lex Multi LMUxxxHV units DIP Switch 3 on outdoor PCB needs to be in OFF position 73 m Page 4 Proper method for ohm testing of thermistors Unplug thermistor from PCB place probe in cold or ice water measure the water temperature and compare ohm reading to ohm chart Repeat with hot water to verify thermistor accuracy across a broad temperature range LG Suction amp Liquid Line Thermistor Ohm Chart Suction amp Liquid thermistors called Tube on previous documents are used on all piping amp coils except the compressor discharge pipe whether on an indoor unit or an outdoor unit de o o o E d bel Fd e oo o io o E 2 e 114 8 2 08 201 186 172 124 0 63 o LD I A Ja an en MEJE BEJE Q2 Slof ejN S O co sain 4 IE 1 d zl o un 723 224 22 2 168
44. rop of low pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 1 check power supply voltage to the outdoor unit is correct 1ph 220 Vac 10 or 3ph 380 Vac 10 check fuses if fuses OK replace outdoor main PCB Sub 1 check power supply voltage to the outdoor unit is correct 1ph 220 Vac 1090 or 3ph 380 Vac 1090 check fuses if fuses OK replace outdoor main PCB Sub 2 check power supply voltage to the outdoor unit is correct 1ph 220 Vac 10 or 3ph 380 Vac 10 check fuses if fuses OK replace outdoor main Sub 2 check power supply voltage to the outdoor unit is correct 1ph 220 Vac 1090 or 3ph 380 1090 check fuses if fuses OK replace outdoor main PCB Faulty 4 way valve Check solenoid coil and output from PCB If OK mechanical failure Excessive discharge temperature rise 105 C Sub condenser 2 standard compressor Check refrigerant Excessive discharge temperature rise 105 C Sub condenser 2 standard compressor Check refrigerant Sub 3 excessive rise of high pressure Check pressures check for non condensables check heat exchanger coil is free from debris Sub 3 reverse or open phase Check all 3 phases are present and correct If correct voltage appears at all three phases swap any two to cure the fault Communication error between Main and Sub outdoor units Check comms wiring and power to all outdoor units Sub 3 high pressure sensor fault Check dc voltage between white
45. t Sink Sensor Error Open Short Cct or over 95C Commercial Product Condensate pump float switch risen Check drain pan is empty check pump is working OK If no pump check blue jumper plug is inserted in socket CN Float Comms Error check your wiring remove external pumps Split Multi check volts from terminal N to 3 0 65 Vdc Multi V 4 Vdc terminals 3 and 4 Comms Error check your wiring remove external pumps Split Multi check volts from terminal N to 3 0 65 Multi V 4 Vdc terminals 3 and 4 Indoor unit coil sensor fault Disconnect from PCB measure resistance 10 kOhm at 10C and 4 kOhm at 30C if not replace sensor Split text 21 Indoor unit coil sensor fault Disconnect from PCB measure resistance 10 kOhm at 10C and 4 kOhm at 30C if not replace sensor Split text 21 Multi Splits and Multi V indoor unit is set to run in a different mode from the master indoor unit Set ALL indoor units to cooling or ALL to heating to clear Splits Compressor Over Current CT2 also see Code 06 Multi Splits and Multi V indoor unit is set to run in a different mode from the master indoor unit Set ALL indoor units to cooling or ALL to heating to clear Splits Compressor Over Current CT2 also see Code 06 RAC Indoor unit BLDC Fan problem This is caused by the Indoor fan being locked Check fan motor is plugged in correctly Electrically amp Mechanically sound Check the fan motor turns freely check the AC Voltage supplied t
46. t from main PCB check contactor and check wiring connections If OK compressor faulty Sub 2 standard compressor 2 not starting Check output from main PCB check contactor and check wiring connections If OK compressor faulty Comms Error between Outdoor Unit HR Box Nol 1 Defective connection in HR unit power supply and transmission connection 2 Wrong setting of the HR unit Rotary switch and Dip switch 3 Defective HR unit PCB Comms Error between Outdoor Unit and HR Box No2 1 Defective connection in HR unit power supply and transmission connection 2 Wrong setting of the HR unit Rotary switch and Dip switch 3 Defective HR unit PCB Comms Error between Outdoor Unit and HR Box No3 1 Defective connection in HR unit power supply and transmission connection 2 Wrong setting of the HR unit Rotary switch and Dip switch 3 Defective HR unit PCB Central controller wiring error Check all comms wiring including between controller and CNU and IP addresses If OK possible defective CNU Central controller data sending error Either defective CNU or Central controller initialisation failure Central controller data receiving error Either defective CNU or Central controller initialisation failure Central controller Comms cable too long or picking up external electrical noise If OK mismatching of controllers or defective CNU Central controller data receiving time out Either defective CNU or Central controller initialisation failure Central contr
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