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Troubleshooting Guide Error No. 21* Master 211 Slave1 212 Slave2 213 Error Type Error Point Main Reasons Inverter PCB Assy IPM Fault occur Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes IPM self protection circuit activation (Overcurrent/IPM overheating/Vcc low voltage) ■ Error diagnosis and countermeasure flow chart Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Yes Is compressor Wire connection condition normal? Yes Is inverter heat sink cooling fan normal? Yes Is inverter PCB assembly normal? Yes Recheck power and installation condition No No No No - 92 - 1.Over current detection at Inverter compressor(U,V,W) 2.Compressor damaged (insulation damaged/Motor damaged) 3.IPM overheating (Heat sink fan damaged/Heat sink fan connector disconnected/Heat sink disassembled) 4.Inverter compressor terminal disconnected or loose 5.Inverter PCB assembly damaged 6.ODU input current low 1. Check resistance between each terminal of compressor (0.34~0.35Ω ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) → Replace compressor if abnormality found 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 abnormality found 1. Check heat sink cooling fan connector connection condition 2. Check heat sink cooling fan wire disconnection and wiring → Reassemble and change wire if abnormality found 3. Check heat sink cooling fan output voltage during compressor operation (Check main PCB assembly CN15 fan connector output voltage : AC 220V) → Replace main PCB if output voltage isn't AC 220V 4. Check heat sink cooling fan motor wire disconnection (measure resistance between each ends of motor connector) (measured value should be within 1.7kΩ ±10%) → Replace fan motor if motor wire is disconnected. Check inverter PCB assembly IPM normality. → Replace inverter PCB assembly if abnormality found. LGE Internal Use Only
* Measuring resistance between each terminal of compressor * IPM joining point Check joining conditon Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 93 - Troubleshooting Guide * Heat sink cooling fan connector * Compressor wire connector connection point * Heat sink cooling fan * Measuring insulation resistance between Comp output terminal and chassis LGE Internal Use Only
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System Outdoor Unit R410A SERVICE M
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Safety Precautions Copyright ©2007
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Ventilate before operating air cond
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Use power cables of sufficient curr
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Safely dispose of the packing mater
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1. Model Names 1.1 Indoor Unit * AR
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2.2 Outdoor Units 2.2.1 Cooling Onl
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3. Combination of Outdoor Units 3.1
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4. Nomenclature 4.1 Indoor Unit ARN
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Part 2 Outdoor Units Copyright ©20
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Function Copyright ©2007 LG Electr
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1.3 Master and slave Unit's EEV con
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2.1.2 Oil return control on heating
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2.3 Stopping operation 2.3.1 Stoppi
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3.2 Discharge temperature control
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4. Other control 4.1 Initial setup
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4.2 Emergency operation - If a comp
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■ Sensor Check Error Code Display
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Liquid Pipe Gas Pipe Procedure 1. A
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CAUTION 1. Guaranteed Temperature r
Page 41 and 42: 4.7 Pump Out This function gathers
Page 43 and 44: 4.8 Auto Back Up Function_Inverter
Page 45 and 46: 4.10 Night Low Noise Function In co
Page 47 and 48: 4.11 Vacuum Mode This function is u
Page 49 and 50: Part 3 PCB Setting and Test Run Cop
Page 51 and 52: 2. How to cope with Test Run abnorm
Page 53 and 54: ■ Checking according to dip switc
Page 55 and 56: Function Dry Contact Snow Forced De
Page 57 and 58: Replacement procedure for Compresso
Page 59 and 60: Part 4 Trouble shooting guide Copyr
Page 61 and 62: Copyright ©2007 LG Electronics. In
Page 63 and 64: 2.2 Fan Motor Checking Item Symptom
Page 65 and 66: • EEV Coil and body(Outdoor unit)
Page 67 and 68: 2.4 Phase Bridge Diode Checking Met
Page 69 and 70: 2.6 Fan IPM Checking Method 2.7 UW1
Page 71 and 72: 2.10 Other Copyright ©2007 LG Elec
Page 73 and 74: Outdoor unit related error Display
Page 77 and 78: Outdoor unit related error Copyrigh
Page 79 and 80: Outdoor unit related error Copyrigh
Page 83 and 84: Error No. 01 Indoor unit air sensor
Page 86 and 87: Troubleshooting Guide float A:Point
Page 88 and 89: Troubleshooting Guide Error No. 06
Page 94 and 95: Troubleshooting Guide Error No. 22*
Page 100 and 101: Troubleshooting Guide * Measuring r
Page 108 and 109: Troubleshooting Guide Error No. Err
Page 110: Troubleshooting Guide Error No. Err
Page 113 and 114: Error No. 52* Master 521 Slave1 522
Page 115 and 116: Error No. Error Type Error Point Ma
Page 117 and 118: Error No. 60* Master 601 Slave1 602
Page 119: Error No. 70* Master 701 Slave1 702
Page 122 and 123: Troubleshooting Guide Measuring inp
Page 140: P/NO : 3828A24006W OCT, 2007
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