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Troubleshooting Guide Error No. 29* Master 291 Slave1 292 Slave2 293 Error Type Error Point Main Reasons Inverter compressor over current Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes Inverter compressor input current is over 30A ■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Yes Is compressor Wire connection condition normal? Yes Is input voltage normal? Yes Is inverter PCB assembly normal? Yes Recheck power and installation condition No No No No - 102 - 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage(Insulation damage/Motor damage) 3. Input voltage low 4. ODU inverter PCB assembly damage 1. Check Pipe clogging/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 (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 Check R~S/S~T/T~R phase voltage is 380V ±10% R~N/S~N/T~N phase voltage is 220V ±10% → Check connection condition and wiring if power is abnorma No Check inverter PCB assembly IPM normality → Replace inverter PCB assembly LGE Internal Use Only
* Measuring resistance between each terminal of compressor * Measuring input voltage Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes * Compressor wire connection - 103 - Troubleshooting Guide 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
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4.7 Pump Out This function gathers
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4.8 Auto Back Up Function_Inverter
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4.10 Night Low Noise Function In co
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4.11 Vacuum Mode This function is u
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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 92 and 93: Troubleshooting Guide Error No. 21*
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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